Move into nested docroot

web/core/modules/migrate/tests/modules/migrate_entity_test/migrate_entity_test.info.yml

@@ -0,0 +1,6 @@
+name: 'Migrate entity test'
+type: module
+description: 'Support module for entity destination test.'
+package: Testing
+version: VERSION
+core: 8.x

web/core/modules/migrate/tests/modules/migrate_entity_test/src/Entity/StringIdEntityTest.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace Drupal\migrate_entity_test\Entity;
+
+use Drupal\Core\Entity\ContentEntityBase;
+use Drupal\Core\Entity\EntityTypeInterface;
+use Drupal\Core\Field\BaseFieldDefinition;
+
+/**
+ * Defines a content entity type that has a string ID.
+ *
+ * @ContentEntityType(
+ *   id = "migrate_string_id_entity_test",
+ *   label = @Translation("String id entity test"),
+ *   base_table = "migrate_entity_test_string_id",
+ *   entity_keys = {
+ *     "id" = "id",
+ *   }
+ * )
+ */
+class StringIdEntityTest extends ContentEntityBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
+    return [
+      'id' => BaseFieldDefinition::create('integer')
+        ->setSetting('size', 'big')
+        ->setLabel('ID'),
+      'version' => BaseFieldDefinition::create('string')
+        ->setLabel('Version'),
+    ];
+  }
+
+}

web/core/modules/migrate/tests/modules/migrate_events_test/migrate_events_test.info.yml

@@ -0,0 +1,5 @@
+name: 'Migrate events test'
+type: module
+package: Testing
+version: VERSION
+core: 8.x

web/core/modules/migrate/tests/modules/migrate_events_test/src/Plugin/migrate/destination/DummyDestination.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace Drupal\migrate_events_test\Plugin\migrate\destination;
+
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate\Plugin\migrate\destination\DestinationBase;
+use Drupal\migrate\Row;
+
+/**
+ * @MigrateDestination(
+ *   id = "dummy",
+ *   requirements_met = true
+ * )
+ */
+class DummyDestination extends DestinationBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getIds() {
+    $ids['value']['type'] = 'string';
+    return $ids;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fields(MigrationInterface $migration = NULL) {
+    return ['value' => 'Dummy value'];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function import(Row $row, array $old_destination_id_values = array()) {
+    return ['value' => $row->getDestinationProperty('value')];
+  }
+
+}

web/core/modules/migrate/tests/modules/migrate_external_translated_test/migrate_external_translated_test.info.yml

@@ -0,0 +1,8 @@
+name: 'Migration external translated test'
+type: module
+package: Testing
+version: VERSION
+core: 8.x
+dependencies:
+  - node
+  - migrate

web/core/modules/migrate/tests/modules/migrate_external_translated_test/migrations/migrate.migration.external_translated_test_node.yml

@@ -0,0 +1,19 @@
+id: external_translated_test_node
+label: External translated content
+source:
+  plugin: migrate_external_translated_test
+  default_lang: true
+  constants:
+    type: external_test
+process:
+  type: constants/type
+  title: title
+  langcode:
+    plugin: static_map
+    source: lang
+    map:
+      English: en
+      French: fr
+      Spanish: es
+destination:
+  plugin: entity:node

web/core/modules/migrate/tests/modules/migrate_external_translated_test/migrations/migrate.migration.external_translated_test_node_translation.yml

@@ -0,0 +1,27 @@
+id: external_translated_test_node_translation
+label: External translated content translations
+source:
+  plugin: migrate_external_translated_test
+  default_lang: false
+  constants:
+    type: external_test
+process:
+  nid:
+    plugin: migration
+    source: name
+    migration: external_translated_test_node
+  type: constants/type
+  title: title
+  langcode:
+    plugin: static_map
+    source: lang
+    map:
+      English: en
+      French: fr
+      Spanish: es
+destination:
+  plugin: entity:node
+  translations: true
+migration_dependencies:
+  required:
+    - external_translated_test_node

web/core/modules/migrate/tests/modules/migrate_external_translated_test/src/Plugin/migrate/source/MigrateExternalTranslatedTestSource.php

@@ -0,0 +1,77 @@
+<?php
+
+namespace Drupal\migrate_external_translated_test\Plugin\migrate\source;
+
+use Drupal\migrate\Plugin\migrate\source\SourcePluginBase;
+
+/**
+ * A simple migrate source for our tests.
+ *
+ * @MigrateSource(
+ *   id = "migrate_external_translated_test"
+ * )
+ */
+class MigrateExternalTranslatedTestSource extends SourcePluginBase {
+
+  /**
+   * The data to import.
+   *
+   * @var array
+   */
+  protected $import = [
+    ['name' => 'cat', 'title' => 'Cat', 'lang' => 'English'],
+    ['name' => 'cat', 'title' => 'Chat', 'lang' => 'French'],
+    ['name' => 'cat', 'title' => 'Gato', 'lang' => 'Spanish'],
+    ['name' => 'dog', 'title' => 'Dog', 'lang' => 'English'],
+    ['name' => 'dog', 'title' => 'Chien', 'lang' => 'French'],
+    ['name' => 'monkey', 'title' => 'Monkey', 'lang' => 'English'],
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fields() {
+    return [
+      'name' => $this->t('Unique name'),
+      'title' => $this->t('Title'),
+      'lang' => $this->t('Language'),
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function __toString() {
+    return '';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getIds() {
+    $ids['name']['type'] = 'string';
+    if (!$this->configuration['default_lang']) {
+      $ids['lang']['type'] = 'string';
+    }
+    return $ids;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function initializeIterator() {
+    $data = [];
+
+    // Keep the rows with the right languages.
+    $want_default = $this->configuration['default_lang'];
+    foreach ($this->import as $row) {
+      $is_english = $row['lang'] == 'English';
+      if ($want_default == $is_english) {
+        $data[] = $row;
+      }
+    }
+
+    return new \ArrayIterator($data);
+  }
+
+}

web/core/modules/migrate/tests/modules/migrate_high_water_test/config/install/node.type.sql_import_node.yml

@@ -0,0 +1,9 @@
+langcode: en
+status: true
+name: High Water import node
+type: high_water_import_node
+description: ''
+help: ''
+new_revision: false
+preview_mode: 1
+display_submitted: true

web/core/modules/migrate/tests/modules/migrate_high_water_test/migrate_sql_test.info.yml

@@ -0,0 +1,7 @@
+type: module
+name: Migrate SQL Source test
+description: 'Provides a database table and records for SQL import testing.'
+package: Testing
+core: 8.x
+dependencies:
+  - migrate

web/core/modules/migrate/tests/modules/migrate_high_water_test/migration_templates/migrate.migration.high_water_test.yml

@@ -0,0 +1,16 @@
+id: high_water_test
+label: High water test.
+source:
+  plugin: high_water_test
+  high_water_property:
+    name: changed
+destination:
+  plugin: entity:node
+migration_tags:
+  test: test
+process:
+  changed: changed
+  title: title
+  type:
+    plugin: default_value
+    default_value: high_water_import_node

web/core/modules/migrate/tests/modules/migrate_high_water_test/src/Plugin/migrate/source/HighWaterTest.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace Drupal\migrate_sql_test\Plugin\migrate\source;
+
+use Drupal\migrate\Plugin\migrate\source\SqlBase;
+
+/**
+ * Source plugin for migration high water tests.
+ *
+ * @MigrateSource(
+ *   id = "high_water_test"
+ * )
+ */
+class HighWaterTest extends SqlBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function query() {
+    $query = $this
+      ->select('high_water_node', 'm')
+      ->fields('m', array_keys($this->fields()));
+    return $query;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fields() {
+    $fields = [
+      'id' => $this->t('Id'),
+      'title' => $this->t('Title'),
+      'changed' => $this->t('Changed'),
+    ];
+
+    return $fields;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getIds() {
+    return [
+      'id' => [
+        'type' => 'integer',
+      ],
+    ];
+  }
+
+}

web/core/modules/migrate/tests/modules/migrate_prepare_row_test/migrate_prepare_row_test.info.yml

@@ -0,0 +1,6 @@
+name: 'Migrate module prepareRow tests'
+type: module
+description: 'Support module for source plugin prepareRow testing.'
+package: Testing
+version: VERSION
+core: 8.x

web/core/modules/migrate/tests/modules/migrate_prepare_row_test/migrate_prepare_row_test.module

@@ -0,0 +1,28 @@
+<?php
+
+/**
+ * @file
+ * Test module for testing the migration source plugin prepareRow() exception
+ * handling.
+ */
+
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate\MigrateSkipRowException;
+use Drupal\migrate\Plugin\MigrateSourceInterface;
+use Drupal\migrate\Row;
+
+/**
+ * Implements hook_migrate_prepare_row().
+ */
+function migrate_prepare_row_test_migrate_prepare_row(Row $row, MigrateSourceInterface $source, MigrationInterface $migration) {
+  // Test both options for save_to_map.
+  $data = $row->getSourceProperty('data');
+  if ($data == 'skip_and_record') {
+    // Record mapping but don't record a message.
+    throw new MigrateSkipRowException('', TRUE);
+  }
+  elseif ($data == 'skip_and_dont_record') {
+    // Don't record mapping but record a message.
+    throw new MigrateSkipRowException('skip_and_dont_record message', FALSE);
+  }
+}

web/core/modules/migrate/tests/modules/migrate_prepare_row_test/src/Plugin/migrate/process/TestSkipRowProcess.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace Drupal\migrate_prepare_row_test\Plugin\migrate\process;
+
+use Drupal\migrate\MigrateExecutableInterface;
+use Drupal\migrate\MigrateSkipRowException;
+use Drupal\migrate\ProcessPluginBase;
+use Drupal\migrate\Row;
+
+/**
+ * Provides a testing process plugin that skips rows.
+ *
+ * @MigrateProcessPlugin(
+ *   id = "test_skip_row_process"
+ * )
+ */
+class TestSkipRowProcess extends ProcessPluginBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
+    // Test both options for save_to_map.
+    $data = $row->getSourceProperty('data');
+    if ($data == 'skip_and_record (use plugin)') {
+      throw new MigrateSkipRowException('', TRUE);
+    }
+    elseif ($data == 'skip_and_dont_record (use plugin)') {
+      throw new MigrateSkipRowException('', FALSE);
+    }
+    return $value;
+  }
+
+}

web/core/modules/migrate/tests/modules/migrate_query_batch_test/migrate_query_batch_test.info.yml

@@ -0,0 +1,7 @@
+type: module
+name: Migrate query batch Source test
+description: 'Provides a database table and records for SQL import with batch testing.'
+package: Testing
+core: 8.x
+dependencies:
+  - migrate

web/core/modules/migrate/tests/modules/migrate_query_batch_test/src/Plugin/migrate/source/QueryBatchTest.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Drupal\migrate_query_batch_test\Plugin\migrate\source;
+
+use Drupal\migrate\Plugin\migrate\source\SqlBase;
+
+/**
+ * Source plugin for migration high water tests.
+ *
+ * @MigrateSource(
+ *   id = "query_batch_test"
+ * )
+ */
+class QueryBatchTest extends SqlBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function query() {
+    return ($this->select('query_batch_test', 'q')->fields('q'));
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fields() {
+    $fields = [
+      'id' => $this->t('Id'),
+      'data' => $this->t('data'),
+    ];
+    return $fields;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getIds() {
+    return [
+      'id' => [
+        'type' => 'integer',
+      ],
+    ];
+  }
+
+}

web/core/modules/migrate/tests/src/Functional/process/DownloadFunctionalTest.php

@@ -0,0 +1,81 @@
+<?php
+
+namespace Drupal\Tests\migrate\Functional\process;
+
+use Drupal\migrate\MigrateExecutable;
+use Drupal\migrate\MigrateMessage;
+use Drupal\migrate\Plugin\MigrateIdMapInterface;
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests the 'download' process plugin.
+ *
+ * @group migrate
+ */
+class DownloadFunctionalTest extends BrowserTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['migrate', 'file'];
+
+  /**
+   * Tests that an exception is thrown bu migration continues with the next row.
+   */
+  public function testExceptionThrow() {
+    $invalid_url = "{$this->baseUrl}/not-existent-404";
+    $valid_url = "{$this->baseUrl}/core/misc/favicon.ico";
+
+    $definition = [
+      'source' => [
+        'plugin' => 'embedded_data',
+        'data_rows' => [
+          ['url' => $invalid_url, 'uri' => 'public://first.txt'],
+          ['url' => $valid_url, 'uri' => 'public://second.ico'],
+        ],
+        'ids' => [
+          'url' => ['type' => 'string'],
+        ],
+      ],
+      'process' => [
+        'uri' => [
+          'plugin' => 'download',
+          'source' => ['url', 'uri'],
+        ]
+      ],
+      'destination' => [
+        'plugin' => 'entity:file',
+      ],
+    ];
+
+    $migration = \Drupal::service('plugin.manager.migration')->createStubMigration($definition);
+
+    $executable = new MigrateExecutable($migration, new MigrateMessage());
+    $result = $executable->import();
+
+    // Check that the migration has completed.
+    $this->assertEquals($result, MigrationInterface::RESULT_COMPLETED);
+
+    /** @var \Drupal\migrate\Plugin\MigrateIdMapInterface $id_map_plugin */
+    $id_map_plugin = $migration->getIdMap();
+
+    // Check that the first row was marked as failed in the id map table.
+    $map_row = $id_map_plugin->getRowBySource(['url' => $invalid_url]);
+    $this->assertEquals(MigrateIdMapInterface::STATUS_FAILED, $map_row['source_row_status']);
+    $this->assertNull($map_row['destid1']);
+
+    // Check that a message with the thrown exception has been logged.
+    $messages = $id_map_plugin->getMessageIterator(['url' => $invalid_url])->fetchAll();
+    $this->assertCount(1, $messages);
+    $message = reset($messages);
+    $this->assertEquals("Cannot read from non-readable stream ($invalid_url)", $message->message);
+    $this->assertEquals(MigrationInterface::MESSAGE_ERROR, $message->level);
+
+    // Check that the second row was migrated successfully.
+    $map_row = $id_map_plugin->getRowBySource(['url' => $valid_url]);
+    $this->assertEquals(MigrateIdMapInterface::STATUS_IMPORTED, $map_row['source_row_status']);
+    $this->assertEquals(1, $map_row['destid1']);
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/HighWaterTest.php

@@ -0,0 +1,177 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel;
+
+/**
+ * Tests migration high water property.
+ *
+ * @group migrate
+ */
+class HighWaterTest extends MigrateTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = [
+    'system',
+    'user',
+    'node',
+    'migrate',
+    'migrate_sql_test',
+    'field',
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    // Create source test table.
+    $this->sourceDatabase->schema()->createTable('high_water_node', [
+      'fields' => [
+        'id' => [
+          'description' => 'Serial',
+          'type' => 'serial',
+          'unsigned' => TRUE,
+          'not null' => TRUE,
+        ],
+        'changed' => [
+          'description' => 'Highwater',
+          'type' => 'int',
+          'unsigned' => TRUE,
+        ],
+        'title' => [
+          'description' => 'Title',
+          'type' => 'varchar',
+          'length' => 128,
+          'not null' => TRUE,
+          'default' => '',
+        ],
+      ],
+      'primary key' => [
+        'id',
+      ],
+      'description' => 'Contains nodes to import',
+    ]);
+
+    // Add 3 items to source table.
+    $this->sourceDatabase->insert('high_water_node')
+      ->fields([
+        'title',
+        'changed',
+      ])
+      ->values([
+        'title' => 'Item 1',
+        'changed' => 1,
+      ])
+      ->values([
+        'title' => 'Item 2',
+        'changed' => 2,
+      ])
+      ->values([
+        'title' => 'Item 3',
+        'changed' => 3,
+      ])
+      ->execute();
+
+    $this->installEntitySchema('node');
+    $this->installEntitySchema('user');
+    $this->installSchema('node', 'node_access');
+
+    $this->executeMigration('high_water_test');
+  }
+
+  /**
+   * Tests high water property of SqlBase.
+   */
+  public function testHighWater() {
+    // Assert all of the nodes have been imported.
+    $this->assertNodeExists('Item 1');
+    $this->assertNodeExists('Item 2');
+    $this->assertNodeExists('Item 3');
+
+    // Update Item 1 setting its high_water_property to value that is below
+    // current high water mark.
+    $this->sourceDatabase->update('high_water_node')
+      ->fields([
+        'title' => 'Item 1 updated',
+        'changed' => 2,
+      ])
+      ->condition('title', 'Item 1')
+      ->execute();
+
+    // Update Item 2 setting its high_water_property to value equal to
+    // current high water mark.
+    $this->sourceDatabase->update('high_water_node')
+      ->fields([
+        'title' => 'Item 2 updated',
+        'changed' => 3,
+      ])
+      ->condition('title', 'Item 2')
+      ->execute();
+
+    // Update Item 3 setting its high_water_property to value that is above
+    // current high water mark.
+    $this->sourceDatabase->update('high_water_node')
+      ->fields([
+        'title' => 'Item 3 updated',
+        'changed' => 4,
+      ])
+      ->condition('title', 'Item 3')
+      ->execute();
+
+    // Execute migration again.
+    $this->executeMigration('high_water_test');
+
+    // Item with lower highwater should not be updated.
+    $this->assertNodeExists('Item 1');
+    $this->assertNodeDoesNotExist('Item 1 updated');
+
+    // Item with equal highwater should not be updated.
+    $this->assertNodeExists('Item 2');
+    $this->assertNodeDoesNotExist('Item 2 updated');
+
+    // Item with greater highwater should be updated.
+    $this->assertNodeExists('Item 3 updated');
+    $this->assertNodeDoesNotExist('Item 3');
+  }
+
+  /**
+   * Assert that node with given title exists.
+   *
+   * @param string $title
+   *   Title of the node.
+   */
+  protected function assertNodeExists($title) {
+    self::assertTrue($this->nodeExists($title));
+  }
+
+  /**
+   * Assert that node with given title does not exist.
+   *
+   * @param string $title
+   *   Title of the node.
+   */
+  protected function assertNodeDoesNotExist($title) {
+    self::assertFalse($this->nodeExists($title));
+  }
+
+  /**
+   * Checks if node with given title exists.
+   *
+   * @param string $title
+   *   Title of the node.
+   *
+   * @return bool
+   */
+  protected function nodeExists($title) {
+    $query = \Drupal::entityQuery('node');
+    $result = $query
+      ->condition('title', $title)
+      ->range(0, 1)
+      ->execute();
+
+    return !empty($result);
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/MigrateBundleTest.php

@@ -0,0 +1,155 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel;
+
+use Drupal\migrate\MigrateExecutable;
+use Drupal\taxonomy\Entity\Term;
+use Drupal\taxonomy\Entity\Vocabulary;
+
+/**
+ * Tests setting of bundles on content entity migrations.
+ *
+ * @group migrate
+ */
+class MigrateBundleTest extends MigrateTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['taxonomy', 'text'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    $this->installEntitySchema('taxonomy_vocabulary');
+    $this->installEntitySchema('taxonomy_term');
+    $this->installConfig(['taxonomy']);
+    // Set up two vocabularies (taxonomy bundles).
+    Vocabulary::create(['vid' => 'tags', 'name' => 'Tags']);
+    Vocabulary::create(['vid' => 'categories', 'name' => 'Categories']);
+  }
+
+  /**
+   * Tests setting the bundle in the destination.
+   */
+  public function testDestinationBundle() {
+    $term_data_rows = [
+      ['id' => 1, 'name' => 'Category 1'],
+    ];
+    $ids = ['id' => ['type' => 'integer']];
+    $definition = [
+      'id' => 'terms',
+      'migration_tags' => ['Bundle test'],
+      'source' => [
+        'plugin' => 'embedded_data',
+        'data_rows' => $term_data_rows,
+        'ids' => $ids,
+      ],
+      'process' => [
+        'tid' => 'id',
+        'name' => 'name',
+      ],
+      'destination' => [
+        'plugin' => 'entity:taxonomy_term',
+        'default_bundle' => 'categories',
+      ],
+      'migration_dependencies' => [],
+    ];
+
+    $term_migration = \Drupal::service('plugin.manager.migration')->createStubMigration($definition);
+
+    // Import and validate the term entity was created with the correct bundle.
+    $term_executable = new MigrateExecutable($term_migration, $this);
+    $term_executable->import();
+    /** @var Term $term */
+    $term = Term::load(1);
+    $this->assertEquals($term->bundle(), 'categories');
+  }
+
+  /**
+   * Tests setting the bundle in the process pipeline.
+   */
+  public function testProcessBundle() {
+    $term_data_rows = [
+      ['id' => 1, 'vocab' => 'categories', 'name' => 'Category 1'],
+      ['id' => 2, 'vocab' => 'tags', 'name' => 'Tag 1'],
+    ];
+    $ids = ['id' => ['type' => 'integer']];
+    $definition = [
+      'id' => 'terms',
+      'migration_tags' => ['Bundle test'],
+      'source' => [
+        'plugin' => 'embedded_data',
+        'data_rows' => $term_data_rows,
+        'ids' => $ids,
+      ],
+      'process' => [
+        'tid' => 'id',
+        'vid' => 'vocab',
+        'name' => 'name',
+      ],
+      'destination' => [
+        'plugin' => 'entity:taxonomy_term',
+      ],
+      'migration_dependencies' => [],
+    ];
+
+    $term_migration = \Drupal::service('plugin.manager.migration')->createStubMigration($definition);
+
+    // Import and validate the term entities were created with the correct bundle.
+    $term_executable = new MigrateExecutable($term_migration, $this);
+    $term_executable->import();
+    /** @var Term $term */
+    $term = Term::load(1);
+    $this->assertEquals($term->bundle(), 'categories');
+    $term = Term::load(2);
+    $this->assertEquals($term->bundle(), 'tags');
+  }
+
+  /**
+   * Tests setting bundles both in process and destination.
+   */
+  public function testMixedBundles() {
+    $term_data_rows = [
+      ['id' => 1, 'vocab' => 'categories', 'name' => 'Category 1'],
+      ['id' => 2, 'name' => 'Tag 1'],
+    ];
+    $ids = ['id' => ['type' => 'integer']];
+    $definition = [
+      'id' => 'terms',
+      'migration_tags' => ['Bundle test'],
+      'source' => [
+        'plugin' => 'embedded_data',
+        'data_rows' => $term_data_rows,
+        'ids' => $ids,
+      ],
+      'process' => [
+        'tid' => 'id',
+        'vid' => 'vocab',
+        'name' => 'name',
+      ],
+      'destination' => [
+        'plugin' => 'entity:taxonomy_term',
+        // When no vocab is provided, the destination bundle is applied.
+        'default_bundle' => 'tags',
+      ],
+      'migration_dependencies' => [],
+    ];
+
+    $term_migration = \Drupal::service('plugin.manager.migration')->createStubMigration($definition);
+
+    // Import and validate the term entities were created with the correct bundle.
+    $term_executable = new MigrateExecutable($term_migration, $this);
+    $term_executable->import();
+    /** @var Term $term */
+    $term = Term::load(1);
+    $this->assertEquals($term->bundle(), 'categories');
+    $term = Term::load(2);
+    $this->assertEquals($term->bundle(), 'tags');
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/MigrateConfigRollbackTest.php

@@ -0,0 +1,170 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel;
+
+use Drupal\migrate\MigrateExecutable;
+
+/**
+ * Tests rolling back of configuration objects.
+ *
+ * @group migrate
+ */
+class MigrateConfigRollbackTest extends MigrateTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['system', 'language', 'config_translation'];
+
+  /**
+   * Tests rolling back configuration.
+   */
+  public function testConfigRollback() {
+    // Use system.site configuration to demonstrate importing and rolling back
+    // configuration.
+    $variable = [
+      [
+        'id' => 'site_name',
+        'site_name' => 'Some site',
+        'site_slogan' => 'Awesome slogan',
+      ],
+    ];
+    $ids = [
+      'id' =>
+        [
+          'type' => 'string'
+        ],
+    ];
+    $definition = [
+      'id' => 'config',
+      'migration_tags' => ['Import and rollback test'],
+      'source' => [
+        'plugin' => 'embedded_data',
+        'data_rows' => $variable,
+        'ids' => $ids,
+      ],
+      'process' => [
+        'name' => 'site_name',
+        'slogan' => 'site_slogan',
+      ],
+      'destination' => [
+        'plugin' => 'config',
+        'config_name' => 'system.site',
+      ],
+    ];
+
+    /** @var \Drupal\migrate\Plugin\Migration $config_migration */
+    $config_migration = \Drupal::service('plugin.manager.migration')
+      ->createStubMigration($definition);
+    $config_id_map = $config_migration->getIdMap();
+
+    // Rollback is not enabled for configuration translations.
+    $this->assertFalse($config_migration->getDestinationPlugin()->supportsRollback());
+
+    // Import and validate config entities were created.
+    $config_executable = new MigrateExecutable($config_migration, $this);
+    $config_executable->import();
+    $config = $this->config('system.site');
+    $this->assertSame('Some site', $config->get('name'));
+    $this->assertSame('Awesome slogan', $config->get('slogan'));
+    $map_row = $config_id_map->getRowBySource(['id' => $variable[0]['id']]);
+    $this->assertNotNull($map_row['destid1']);
+
+    // Rollback and verify the configuration changes are still there.
+    $config_executable->rollback();
+    $config = $this->config('system.site');
+    $this->assertSame('Some site', $config->get('name'));
+    $this->assertSame('Awesome slogan', $config->get('slogan'));
+    // Confirm the map row is deleted.
+    $map_row = $config_id_map->getRowBySource(['id' => $variable[0]['id']]);
+    $this->assertNull($map_row['destid1']);
+
+    // We use system configuration to demonstrate importing and rolling back
+    // configuration translations.
+    $i18n_variable = [
+      [
+        'id' => 'site_name',
+        'language' => 'fr',
+        'site_name' => 'fr - Some site',
+        'site_slogan' => 'fr - Awesome slogan',
+      ],
+      [
+        'id' => 'site_name',
+        'language' => 'is',
+        'site_name' => 'is - Some site',
+        'site_slogan' => 'is - Awesome slogan',
+      ],
+    ];
+    $ids = [
+      'id' =>
+        [
+          'type' => 'string'
+        ],
+      'language' =>
+        [
+          'type' => 'string'
+        ]
+    ];
+    $definition = [
+      'id' => 'i18n_config',
+      'migration_tags' => ['Import and rollback test'],
+      'source' => [
+        'plugin' => 'embedded_data',
+        'data_rows' => $i18n_variable,
+        'ids' => $ids,
+      ],
+      'process' => [
+        'langcode' => 'language',
+        'name' => 'site_name',
+        'slogan' => 'site_slogan',
+      ],
+      'destination' => [
+        'plugin' => 'config',
+        'config_name' => 'system.site',
+        'translations' => 'true',
+      ],
+    ];
+
+    $config_migration = \Drupal::service('plugin.manager.migration')
+      ->createStubMigration($definition);
+    $config_id_map = $config_migration->getIdMap();
+
+    // Rollback is enabled for configuration translations.
+    $this->assertTrue($config_migration->getDestinationPlugin()->supportsRollback());
+
+    // Import and validate config entities were created.
+    $config_executable = new MigrateExecutable($config_migration, $this);
+    $config_executable->import();
+
+    $language_manager = \Drupal::service('language_manager');
+    foreach ($i18n_variable as $row) {
+      $langcode = $row['language'];
+      /** @var \Drupal\language\Config\LanguageConfigOverride $config_translation */
+      $config_translation = $language_manager->getLanguageConfigOverride($langcode, 'system.site');
+      $this->assertSame($row['site_name'], $config_translation->get('name'));
+      $this->assertSame($row['site_slogan'], $config_translation->get('slogan'));
+      $map_row = $config_id_map->getRowBySource(['id' => $row['id'], 'language' => $row['language']]);
+      $this->assertNotNull($map_row['destid1']);
+    }
+
+    // Rollback and verify the translation have been removed.
+    $config_executable->rollback();
+    foreach ($i18n_variable as $row) {
+      $langcode = $row['language'];
+      $config_translation = $language_manager->getLanguageConfigOverride($langcode, 'system.site');
+      $this->assertNull($config_translation->get('name'));
+      $this->assertNull($config_translation->get('slogan'));
+      // Confirm the map row is deleted.
+      $map_row = $config_id_map->getRowBySource(['id' => $row['id'], 'language' => $langcode]);
+      $this->assertFalse($map_row);
+    }
+
+    // Test that the configuration is still present.
+    $config = $this->config('system.site');
+    $this->assertSame('Some site', $config->get('name'));
+    $this->assertSame('Awesome slogan', $config->get('slogan'));
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/MigrateDumpAlterInterface.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel;
+
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * Allows tests to alter dumps after they have loaded.
+ *
+ * @see \Drupal\migrate_drupal\Tests\d6\MigrateFileTest
+ */
+interface MigrateDumpAlterInterface {
+
+  /**
+   * Allows tests to alter dumps after they have loaded.
+   *
+   * @param \Drupal\KernelTests\KernelTestBase $test
+   *   The test that is being run.
+   */
+  public static function migrateDumpAlter(KernelTestBase $test);
+
+}

web/core/modules/migrate/tests/src/Kernel/MigrateEmbeddedDataTest.php

@@ -0,0 +1,69 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel;
+
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * Tests the EmbeddedDataSource plugin.
+ *
+ * @group migrate
+ */
+class MigrateEmbeddedDataTest extends KernelTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['migrate'];
+
+  /**
+   * Tests the embedded_data source plugin.
+   */
+  public function testEmbeddedData() {
+    $data_rows = [
+      ['key' => '1', 'field1' => 'f1value1', 'field2' => 'f2value1'],
+      ['key' => '2', 'field1' => 'f1value2', 'field2' => 'f2value2'],
+    ];
+    $ids = ['key' => ['type' => 'integer']];
+    $definition = [
+      'migration_tags' => ['Embedded data test'],
+      'source' => [
+        'plugin' => 'embedded_data',
+        'data_rows' => $data_rows,
+        'ids' => $ids,
+      ],
+      'process' => [],
+      'destination' => ['plugin' => 'null'],
+    ];
+
+    $migration = \Drupal::service('plugin.manager.migration')->createStubMigration($definition);
+    $source = $migration->getSourcePlugin();
+
+    // Validate the plugin returns the source data that was provided.
+    $results = [];
+    /** @var \Drupal\migrate\Row $row */
+    foreach ($source as $row) {
+      $data_row = $row->getSource();
+      // The "data" row returned by getSource() also includes all source
+      // configuration - we remove it so we see only the data itself.
+      unset($data_row['plugin']);
+      unset($data_row['data_rows']);
+      unset($data_row['ids']);
+      $results[] = $data_row;
+    }
+    $this->assertIdentical($results, $data_rows);
+
+    // Validate the public APIs.
+    $this->assertIdentical($source->count(), count($data_rows));
+    $this->assertIdentical($source->getIds(), $ids);
+    $expected_fields = [
+      'key' => 'key',
+      'field1' => 'field1',
+      'field2' => 'field2',
+    ];
+    $this->assertIdentical($source->fields(), $expected_fields);
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/MigrateEntityContentBaseTest.php

@@ -0,0 +1,207 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel;
+
+use Drupal\KernelTests\KernelTestBase;
+use Drupal\language\Entity\ConfigurableLanguage;
+use Drupal\migrate\MigrateExecutable;
+use Drupal\migrate\MigrateMessage;
+use Drupal\migrate\Plugin\migrate\destination\EntityContentBase;
+use Drupal\migrate\Plugin\MigrateIdMapInterface;
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate\Row;
+
+/**
+ * Tests the EntityContentBase destination.
+ *
+ * @group migrate
+ */
+class MigrateEntityContentBaseTest extends KernelTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['migrate', 'user', 'language', 'entity_test'];
+
+  /**
+   * The storage for entity_test_mul.
+   *
+   * @var \Drupal\Core\Entity\ContentEntityStorageInterface
+   */
+  protected $storage;
+
+  /**
+   * A content migrate destination.
+   *
+   * @var \Drupal\migrate\Plugin\MigrateDestinationInterface
+   */
+  protected $destination;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    $this->installEntitySchema('entity_test_mul');
+
+    ConfigurableLanguage::createFromLangcode('en')->save();
+    ConfigurableLanguage::createFromLangcode('fr')->save();
+
+    $this->storage = $this->container->get('entity.manager')->getStorage('entity_test_mul');
+  }
+
+  /**
+   * Check the existing translations of an entity.
+   *
+   * @param int $id
+   *   The entity ID.
+   * @param string $default
+   *   The expected default translation language code.
+   * @param string[] $others
+   *   The expected other translation language codes.
+   */
+  protected function assertTranslations($id, $default, $others = []) {
+    $entity = $this->storage->load($id);
+    $this->assertTrue($entity, "Entity exists");
+    $this->assertEquals($default, $entity->language()->getId(), "Entity default translation");
+    $translations = array_keys($entity->getTranslationLanguages(FALSE));
+    sort($others);
+    sort($translations);
+    $this->assertEquals($others, $translations, "Entity translations");
+  }
+
+  /**
+   * Create the destination plugin to test.
+   *
+   * @param array $configuration
+   *   The plugin configuration.
+   */
+  protected function createDestination(array $configuration) {
+    $this->destination = new EntityContentBase(
+      $configuration,
+      'fake_plugin_id',
+      [],
+      $this->getMock(MigrationInterface::class),
+      $this->storage,
+      [],
+      $this->container->get('entity.manager'),
+      $this->container->get('plugin.manager.field.field_type')
+    );
+  }
+
+  /**
+   * Test importing and rolling back translated entities.
+   */
+  public function testTranslated() {
+    // Create a destination.
+    $this->createDestination(['translations' => TRUE]);
+
+    // Create some pre-existing entities.
+    $this->storage->create(['id' => 1, 'langcode' => 'en'])->save();
+    $this->storage->create(['id' => 2, 'langcode' => 'fr'])->save();
+    $translated = $this->storage->create(['id' => 3, 'langcode' => 'en']);
+    $translated->save();
+    $translated->addTranslation('fr')->save();
+
+    // Pre-assert that things are as expected.
+    $this->assertTranslations(1, 'en');
+    $this->assertTranslations(2, 'fr');
+    $this->assertTranslations(3, 'en', ['fr']);
+    $this->assertFalse($this->storage->load(4));
+
+    $destination_rows = [
+      // Existing default translation.
+      ['id' => 1, 'langcode' => 'en', 'action' => MigrateIdMapInterface::ROLLBACK_PRESERVE],
+      // New translation.
+      ['id' => 2, 'langcode' => 'en', 'action' => MigrateIdMapInterface::ROLLBACK_DELETE],
+      // Existing non-default translation.
+      ['id' => 3, 'langcode' => 'fr', 'action' => MigrateIdMapInterface::ROLLBACK_PRESERVE],
+      // Brand new row.
+      ['id' => 4, 'langcode' => 'fr', 'action' => MigrateIdMapInterface::ROLLBACK_DELETE],
+    ];
+    $rollback_actions = [];
+
+    // Import some rows.
+    foreach ($destination_rows as $idx => $destination_row) {
+      $row = new Row();
+      foreach ($destination_row as $key => $value) {
+        $row->setDestinationProperty($key, $value);
+      }
+      $this->destination->import($row);
+
+      // Check that the rollback action is correct, and save it.
+      $this->assertEquals($destination_row['action'], $this->destination->rollbackAction());
+      $rollback_actions[$idx] = $this->destination->rollbackAction();
+    }
+
+    $this->assertTranslations(1, 'en');
+    $this->assertTranslations(2, 'fr', ['en']);
+    $this->assertTranslations(3, 'en', ['fr']);
+    $this->assertTranslations(4, 'fr');
+
+    // Rollback the rows.
+    foreach ($destination_rows as $idx => $destination_row) {
+      if ($rollback_actions[$idx] == MigrateIdMapInterface::ROLLBACK_DELETE) {
+        $this->destination->rollback($destination_row);
+      }
+    }
+
+    // No change, update of existing translation.
+    $this->assertTranslations(1, 'en');
+    // Remove added translation.
+    $this->assertTranslations(2, 'fr');
+    // No change, update of existing translation.
+    $this->assertTranslations(3, 'en', ['fr']);
+    // No change, can't remove default translation.
+    $this->assertTranslations(4, 'fr');
+  }
+
+  /**
+   * Tests creation of ID columns table with definitions taken from entity type.
+   */
+  public function testEntityWithStringId() {
+    $this->enableModules(['migrate_entity_test']);
+    $this->installEntitySchema('migrate_string_id_entity_test');
+
+    $definition = [
+      'source' => [
+        'plugin' => 'embedded_data',
+        'data_rows' => [
+          ['id' => 123, 'version' => 'foo'],
+          // This integer needs an 'int' schema with 'big' size. If 'destid1'
+          // is not correctly taking the definition from the destination entity
+          // type, the import will fail with a SQL exception.
+          ['id' => 123456789012, 'version' => 'bar'],
+        ],
+        'ids' => [
+          'id' => ['type' => 'integer', 'size' => 'big'],
+          'version' => ['type' => 'string'],
+        ],
+      ],
+      'process' => [
+        'id' => 'id',
+        'version' => 'version',
+      ],
+      'destination' => [
+        'plugin' => 'entity:migrate_string_id_entity_test',
+      ],
+    ];
+
+    $migration = \Drupal::service('plugin.manager.migration')->createStubMigration($definition);
+    $executable = new MigrateExecutable($migration, new MigrateMessage());
+    $result = $executable->import();
+    $this->assertEquals(MigrationInterface::RESULT_COMPLETED, $result);
+
+    /** @var \Drupal\migrate\Plugin\MigrateIdMapInterface $id_map_plugin */
+    $id_map_plugin = $migration->getIdMap();
+
+    // Check that the destination has been stored.
+    $map_row = $id_map_plugin->getRowBySource(['id' => 123, 'version' => 'foo']);
+    $this->assertEquals(123, $map_row['destid1']);
+    $map_row = $id_map_plugin->getRowBySource(['id' => 123456789012, 'version' => 'bar']);
+    $this->assertEquals(123456789012, $map_row['destid1']);
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/MigrateEventsTest.php

@@ -0,0 +1,218 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel;
+
+use Drupal\migrate\Event\MigrateImportEvent;
+use Drupal\migrate\Event\MigrateMapDeleteEvent;
+use Drupal\migrate\Event\MigrateMapSaveEvent;
+use Drupal\migrate\Event\MigratePostRowSaveEvent;
+use Drupal\migrate\Event\MigratePreRowSaveEvent;
+use Drupal\migrate\MigrateMessage;
+use Drupal\migrate\Event\MigrateEvents;
+use Drupal\migrate\MigrateExecutable;
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * Tests events fired on migrations.
+ *
+ * @group migrate
+ */
+class MigrateEventsTest extends KernelTestBase {
+
+  /**
+   * State service for recording information received by event listeners.
+   *
+   * @var \Drupal\Core\State\State
+   */
+  protected $state;
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['migrate', 'migrate_events_test'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    $this->state = \Drupal::state();
+    \Drupal::service('event_dispatcher')->addListener(MigrateEvents::MAP_SAVE,
+      array($this, 'mapSaveEventRecorder'));
+    \Drupal::service('event_dispatcher')->addListener(MigrateEvents::MAP_DELETE,
+      array($this, 'mapDeleteEventRecorder'));
+    \Drupal::service('event_dispatcher')->addListener(MigrateEvents::PRE_IMPORT,
+      array($this, 'preImportEventRecorder'));
+    \Drupal::service('event_dispatcher')->addListener(MigrateEvents::POST_IMPORT,
+      array($this, 'postImportEventRecorder'));
+    \Drupal::service('event_dispatcher')->addListener(MigrateEvents::PRE_ROW_SAVE,
+      array($this, 'preRowSaveEventRecorder'));
+    \Drupal::service('event_dispatcher')->addListener(MigrateEvents::POST_ROW_SAVE,
+      array($this, 'postRowSaveEventRecorder'));
+  }
+
+  /**
+   * Tests migration events.
+   */
+  public function testMigrateEvents() {
+    // Run a simple little migration, which should trigger one of each event
+    // other than map_delete.
+    $definition = [
+      'migration_tags' => ['Event test'],
+      'source' => [
+        'plugin' => 'embedded_data',
+        'data_rows' => [
+          ['data' => 'dummy value'],
+        ],
+        'ids' => [
+          'data' => ['type' => 'string'],
+        ],
+      ],
+      'process' => ['value' => 'data'],
+      'destination' => ['plugin' => 'dummy'],
+    ];
+
+    $migration = \Drupal::service('plugin.manager.migration')->createStubMigration($definition);
+
+    $executable = new MigrateExecutable($migration, new MigrateMessage());
+    // As the import runs, events will be dispatched, recording the received
+    // information in state.
+    $executable->import();
+
+    // Validate from the recorded state that the events were received.
+    $event = $this->state->get('migrate_events_test.pre_import_event', []);
+    $this->assertIdentical($event['event_name'], MigrateEvents::PRE_IMPORT);
+    $this->assertIdentical($event['migration']->id(), $migration->id());
+
+    $event = $this->state->get('migrate_events_test.post_import_event', []);
+    $this->assertIdentical($event['event_name'], MigrateEvents::POST_IMPORT);
+    $this->assertIdentical($event['migration']->id(), $migration->id());
+
+    $event = $this->state->get('migrate_events_test.map_save_event', []);
+    $this->assertIdentical($event['event_name'], MigrateEvents::MAP_SAVE);
+    // Validating the last row processed.
+    $this->assertIdentical($event['fields']['sourceid1'], 'dummy value');
+    $this->assertIdentical($event['fields']['destid1'], 'dummy value');
+    $this->assertIdentical($event['fields']['source_row_status'], 0);
+
+    $event = $this->state->get('migrate_events_test.map_delete_event', []);
+    $this->assertIdentical($event, []);
+
+    $event = $this->state->get('migrate_events_test.pre_row_save_event', []);
+    $this->assertIdentical($event['event_name'], MigrateEvents::PRE_ROW_SAVE);
+    $this->assertIdentical($event['migration']->id(), $migration->id());
+    // Validating the last row processed.
+    $this->assertIdentical($event['row']->getSourceProperty('data'), 'dummy value');
+
+    $event = $this->state->get('migrate_events_test.post_row_save_event', []);
+    $this->assertIdentical($event['event_name'], MigrateEvents::POST_ROW_SAVE);
+    $this->assertIdentical($event['migration']->id(), $migration->id());
+    // Validating the last row processed.
+    $this->assertIdentical($event['row']->getSourceProperty('data'), 'dummy value');
+    $this->assertIdentical($event['destination_id_values']['value'], 'dummy value');
+
+    // Generate a map delete event.
+    $migration->getIdMap()->delete(['data' => 'dummy value']);
+    $event = $this->state->get('migrate_events_test.map_delete_event', []);
+    $this->assertIdentical($event['event_name'], MigrateEvents::MAP_DELETE);
+    $this->assertIdentical($event['source_id'], ['data' => 'dummy value']);
+  }
+
+  /**
+   * Reacts to map save event.
+   *
+   * @param \Drupal\Migrate\Event\MigrateMapSaveEvent $event
+   *   The migration event.
+   * @param string $name
+   *   The event name.
+   */
+  public function mapSaveEventRecorder(MigrateMapSaveEvent $event, $name) {
+    $this->state->set('migrate_events_test.map_save_event', array(
+      'event_name' => $name,
+      'map' => $event->getMap(),
+      'fields' => $event->getFields(),
+    ));
+  }
+
+  /**
+   * Reacts to map delete event.
+   *
+   * @param \Drupal\Migrate\Event\MigrateMapDeleteEvent $event
+   *   The migration event.
+   * @param string $name
+   *   The event name.
+   */
+  public function mapDeleteEventRecorder(MigrateMapDeleteEvent $event, $name) {
+    $this->state->set('migrate_events_test.map_delete_event', array(
+      'event_name' => $name,
+      'map' => $event->getMap(),
+      'source_id' => $event->getSourceId(),
+    ));
+  }
+
+  /**
+   * Reacts to pre-import event.
+   *
+   * @param \Drupal\Migrate\Event\MigrateImportEvent $event
+   *   The migration event.
+   * @param string $name
+   *   The event name.
+   */
+  public function preImportEventRecorder(MigrateImportEvent $event, $name) {
+    $this->state->set('migrate_events_test.pre_import_event', array(
+      'event_name' => $name,
+      'migration' => $event->getMigration(),
+    ));
+  }
+
+  /**
+   * Reacts to post-import event.
+   *
+   * @param \Drupal\Migrate\Event\MigrateImportEvent $event
+   *   The migration event.
+   * @param string $name
+   *   The event name.
+   */
+  public function postImportEventRecorder(MigrateImportEvent $event, $name) {
+    $this->state->set('migrate_events_test.post_import_event', array(
+      'event_name' => $name,
+      'migration' => $event->getMigration(),
+    ));
+  }
+
+  /**
+   * Reacts to pre-row-save event.
+   *
+   * @param \Drupal\Migrate\Event\MigratePreRowSaveEvent $event
+   *   The migration event.
+   * @param string $name
+   *   The event name.
+   */
+  public function preRowSaveEventRecorder(MigratePreRowSaveEvent $event, $name) {
+    $this->state->set('migrate_events_test.pre_row_save_event', array(
+      'event_name' => $name,
+      'migration' => $event->getMigration(),
+      'row' => $event->getRow(),
+    ));
+  }
+
+  /**
+   * Reacts to post-row-save event.
+   *
+   * @param \Drupal\Migrate\Event\MigratePostRowSaveEvent $event
+   *   The migration event.
+   * @param string $name
+   *   The event name.
+   */
+  public function postRowSaveEventRecorder(MigratePostRowSaveEvent $event, $name) {
+    $this->state->set('migrate_events_test.post_row_save_event', array(
+      'event_name' => $name,
+      'migration' => $event->getMigration(),
+      'row' => $event->getRow(),
+      'destination_id_values' => $event->getDestinationIdValues(),
+    ));
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/MigrateExternalTranslatedTest.php

@@ -0,0 +1,92 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel;
+
+use Drupal\language\Entity\ConfigurableLanguage;
+use Drupal\migrate\MigrateExecutable;
+use Drupal\node\Entity\NodeType;
+
+/**
+ * Tests migrating non-Drupal translated content.
+ *
+ * Ensure it's possible to migrate in translations, even if there's no nid or
+ * tnid property on the source.
+ *
+ * @group migrate
+ */
+class MigrateExternalTranslatedTest extends MigrateTestBase {
+
+  /**
+   * {@inheritdoc}
+   *
+   * @todo: Remove migrate_drupal when https://www.drupal.org/node/2560795 is
+   * fixed.
+   */
+  public static $modules = ['system', 'user', 'language', 'node', 'field', 'migrate_drupal', 'migrate_external_translated_test'];
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
+    parent::setUp();
+    $this->installSchema('system', ['sequences']);
+    $this->installSchema('node', array('node_access'));
+    $this->installEntitySchema('user');
+    $this->installEntitySchema('node');
+
+    // Create some languages.
+    ConfigurableLanguage::createFromLangcode('en')->save();
+    ConfigurableLanguage::createFromLangcode('fr')->save();
+    ConfigurableLanguage::createFromLangcode('es')->save();
+
+    // Create a content type.
+    NodeType::create([
+      'type' => 'external_test',
+      'name' => 'Test node type',
+    ])->save();
+  }
+
+  /**
+   * Test importing and rolling back our data.
+   */
+  public function testMigrations() {
+    /** @var \Drupal\Core\Entity\ContentEntityStorageInterface $storage */
+    $storage = $this->container->get('entity.manager')->getStorage('node');
+    $this->assertEquals(0, count($storage->loadMultiple()));
+
+    // Run the migrations.
+    $migration_ids = ['external_translated_test_node', 'external_translated_test_node_translation'];
+    $this->executeMigrations($migration_ids);
+    $this->assertEquals(3, count($storage->loadMultiple()));
+
+    $node = $storage->load(1);
+    $this->assertEquals('en', $node->language()->getId());
+    $this->assertEquals('Cat', $node->title->value);
+    $this->assertEquals('Chat', $node->getTranslation('fr')->title->value);
+    $this->assertEquals('Gato', $node->getTranslation('es')->title->value);
+
+    $node = $storage->load(2);
+    $this->assertEquals('en', $node->language()->getId());
+    $this->assertEquals('Dog', $node->title->value);
+    $this->assertEquals('Chien', $node->getTranslation('fr')->title->value);
+    $this->assertFalse($node->hasTranslation('es'), "No spanish translation for node 2");
+
+    $node = $storage->load(3);
+    $this->assertEquals('en', $node->language()->getId());
+    $this->assertEquals('Monkey', $node->title->value);
+    $this->assertFalse($node->hasTranslation('fr'), "No french translation for node 3");
+    $this->assertFalse($node->hasTranslation('es'), "No spanish translation for node 3");
+
+    $this->assertNull($storage->load(4), "No node 4 migrated");
+
+    // Roll back the migrations.
+    foreach ($migration_ids as $migration_id) {
+      $migration = $this->getMigration($migration_id);
+      $executable = new MigrateExecutable($migration, $this);
+      $executable->rollback();
+    }
+
+    $this->assertEquals(0, count($storage->loadMultiple()));
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/MigrateInterruptionTest.php

@@ -0,0 +1,82 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel;
+
+use Drupal\migrate\Event\MigratePostRowSaveEvent;
+use Drupal\migrate\MigrateMessage;
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate\Event\MigrateEvents;
+use Drupal\migrate\MigrateExecutable;
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * Tests interruptions triggered during migrations.
+ *
+ * @group migrate
+ */
+class MigrateInterruptionTest extends KernelTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['migrate', 'migrate_events_test'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    \Drupal::service('event_dispatcher')->addListener(MigrateEvents::POST_ROW_SAVE,
+      array($this, 'postRowSaveEventRecorder'));
+  }
+
+  /**
+   * Tests migration interruptions.
+   */
+  public function testMigrateEvents() {
+    // Run a simple little migration, which should trigger one of each event
+    // other than map_delete.
+    $definition = [
+      'migration_tags' => ['Interruption test'],
+      'source' => [
+        'plugin' => 'embedded_data',
+        'data_rows' => [
+          ['data' => 'dummy value'],
+          ['data' => 'dummy value2'],
+        ],
+        'ids' => [
+          'data' => ['type' => 'string'],
+        ],
+      ],
+      'process' => ['value' => 'data'],
+      'destination' => ['plugin' => 'dummy'],
+    ];
+
+    $migration = \Drupal::service('plugin.manager.migration')->createStubMigration($definition);
+
+    $executable = new MigrateExecutable($migration, new MigrateMessage());
+    // When the import runs, the first row imported will trigger an
+    // interruption.
+    $result = $executable->import();
+
+    $this->assertEqual($result, MigrationInterface::RESULT_INCOMPLETE);
+
+    // The status should have been reset to IDLE.
+    $this->assertEqual($migration->getStatus(), MigrationInterface::STATUS_IDLE);
+  }
+
+  /**
+   * Reacts to post-row-save event.
+   *
+   * @param \Drupal\Migrate\Event\MigratePostRowSaveEvent $event
+   *   The migration event.
+   * @param string $name
+   *   The event name.
+   */
+  public function postRowSaveEventRecorder(MigratePostRowSaveEvent $event, $name) {
+    $event->getMigration()->interruptMigration(MigrationInterface::RESULT_INCOMPLETE);
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/MigrateMessageTest.php

@@ -0,0 +1,126 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel;
+
+use Drupal\KernelTests\KernelTestBase;
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate\Event\MigrateEvents;
+use Drupal\migrate\Event\MigrateIdMapMessageEvent;
+use Drupal\migrate\MigrateExecutable;
+use Drupal\migrate\MigrateMessageInterface;
+
+/**
+ * Tests whether idmap messages are sent to message interface when requested.
+ *
+ * @group migrate
+ */
+class MigrateMessageTest extends KernelTestBase implements MigrateMessageInterface {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['migrate', 'system'];
+
+  /**
+   * Migration to run.
+   *
+   * @var \Drupal\migrate\Plugin\MigrationInterface
+   */
+  protected $migration;
+
+  /**
+   * Messages accumulated during the migration run.
+   *
+   * @var array
+   */
+  protected $messages = [];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $this->installConfig(['system']);
+
+    // A simple migration, which will generate a message to the ID map because
+    // the concat plugin throws an exception if its source is not an array.
+    $definition = [
+      'migration_tags' => ['Message test'],
+      'source' => [
+        'plugin' => 'embedded_data',
+        'data_rows' => [
+          ['name' => 'source_message', 'value' => 'a message'],
+        ],
+        'ids' => [
+          'name' => ['type' => 'string'],
+        ],
+      ],
+      'process' => [
+        'message' => [
+          'plugin' => 'concat',
+          'source' => 'value',
+        ],
+      ],
+      'destination' => [
+        'plugin' => 'config',
+        'config_name' => 'system.maintenance',
+      ],
+    ];
+
+    $this->migration = \Drupal::service('plugin.manager.migration')->createStubMigration($definition);
+  }
+
+  /**
+   * Tests migration interruptions.
+   */
+  public function testMessagesNotTeed() {
+    // We don't ask for messages to be teed, so don't expect any.
+    $executable = new MigrateExecutable($this->migration, $this);
+    $executable->import();
+    $this->assertIdentical(count($this->messages), 0);
+  }
+
+  /**
+   * Tests migration interruptions.
+   */
+  public function testMessagesTeed() {
+    // Ask to receive any messages sent to the idmap.
+    \Drupal::service('event_dispatcher')->addListener(MigrateEvents::IDMAP_MESSAGE,
+      array($this, 'mapMessageRecorder'));
+    $executable = new MigrateExecutable($this->migration, $this);
+    $executable->import();
+    $this->assertIdentical(count($this->messages), 1);
+    $this->assertIdentical(reset($this->messages), "source_message: 'a message' is not an array");
+  }
+
+  /**
+   * Reacts to map message event.
+   *
+   * @param \Drupal\Migrate\Event\MigrateIdMapMessageEvent $event
+   *   The migration event.
+   * @param string $name
+   *   The event name.
+   */
+  public function mapMessageRecorder(MigrateIdMapMessageEvent $event, $name) {
+    if ($event->getLevel() == MigrationInterface::MESSAGE_NOTICE ||
+        $event->getLevel() == MigrationInterface::MESSAGE_INFORMATIONAL) {
+      $type = 'status';
+    }
+    else {
+      $type = 'error';
+    }
+    $source_id_string = implode(',', $event->getSourceIdValues());
+    $this->display($source_id_string . ': ' . $event->getMessage(), $type);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function display($message, $type = 'status') {
+    $this->messages[] = $message;
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/MigrateRollbackTest.php

@@ -0,0 +1,183 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel;
+
+use Drupal\migrate\MigrateExecutable;
+use Drupal\migrate\Plugin\MigrateIdMapInterface;
+use Drupal\migrate\Row;
+use Drupal\taxonomy\Entity\Term;
+use Drupal\taxonomy\Entity\Vocabulary;
+
+/**
+ * Tests rolling back of imports.
+ *
+ * @group migrate
+ */
+class MigrateRollbackTest extends MigrateTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['field', 'taxonomy', 'text'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    $this->installEntitySchema('taxonomy_vocabulary');
+    $this->installEntitySchema('taxonomy_term');
+    $this->installConfig(['taxonomy']);
+  }
+
+  /**
+   * Tests rolling back configuration and content entities.
+   */
+  public function testRollback() {
+    // We use vocabularies to demonstrate importing and rolling back
+    // configuration entities.
+    $vocabulary_data_rows = [
+      ['id' => '1', 'name' => 'categories', 'weight' => '2'],
+      ['id' => '2', 'name' => 'tags', 'weight' => '1'],
+    ];
+    $ids = ['id' => ['type' => 'integer']];
+    $definition = [
+      'id' => 'vocabularies',
+      'migration_tags' => ['Import and rollback test'],
+      'source' => [
+        'plugin' => 'embedded_data',
+        'data_rows' => $vocabulary_data_rows,
+        'ids' => $ids,
+      ],
+      'process' => [
+        'vid' => 'id',
+        'name' => 'name',
+        'weight' => 'weight',
+      ],
+      'destination' => ['plugin' => 'entity:taxonomy_vocabulary'],
+    ];
+
+    $vocabulary_migration = \Drupal::service('plugin.manager.migration')->createStubMigration($definition);
+    $vocabulary_id_map = $vocabulary_migration->getIdMap();
+
+    $this->assertTrue($vocabulary_migration->getDestinationPlugin()->supportsRollback());
+
+    // Import and validate vocabulary config entities were created.
+    $vocabulary_executable = new MigrateExecutable($vocabulary_migration, $this);
+    $vocabulary_executable->import();
+    foreach ($vocabulary_data_rows as $row) {
+      /** @var Vocabulary $vocabulary */
+      $vocabulary = Vocabulary::load($row['id']);
+      $this->assertTrue($vocabulary);
+      $map_row = $vocabulary_id_map->getRowBySource(['id' => $row['id']]);
+      $this->assertNotNull($map_row['destid1']);
+    }
+
+    // We use taxonomy terms to demonstrate importing and rolling back content
+    // entities.
+    $term_data_rows = [
+      ['id' => '1', 'vocab' => '1', 'name' => 'music'],
+      ['id' => '2', 'vocab' => '2', 'name' => 'Bach'],
+      ['id' => '3', 'vocab' => '2', 'name' => 'Beethoven'],
+    ];
+    $ids = ['id' => ['type' => 'integer']];
+    $definition = [
+      'id' => 'terms',
+      'migration_tags' => ['Import and rollback test'],
+      'source' => [
+        'plugin' => 'embedded_data',
+        'data_rows' => $term_data_rows,
+        'ids' => $ids,
+      ],
+      'process' => [
+        'tid' => 'id',
+        'vid' => 'vocab',
+        'name' => 'name',
+      ],
+      'destination' => ['plugin' => 'entity:taxonomy_term'],
+      'migration_dependencies' => ['required' => ['vocabularies']],
+    ];
+
+    $term_migration = \Drupal::service('plugin.manager.migration')->createStubMigration($definition);
+    $term_id_map = $term_migration->getIdMap();
+
+    $this->assertTrue($term_migration->getDestinationPlugin()->supportsRollback());
+
+    // Pre-create a term, to make sure it isn't deleted on rollback.
+    $preserved_term_ids[] = 1;
+    $new_term = Term::create(['tid' => 1, 'vid' => 1, 'name' => 'music']);
+    $new_term->save();
+
+    // Import and validate term entities were created.
+    $term_executable = new MigrateExecutable($term_migration, $this);
+    $term_executable->import();
+    // Also explicitly mark one row to be preserved on rollback.
+    $preserved_term_ids[] = 2;
+    $map_row = $term_id_map->getRowBySource(['id' => 2]);
+    $dummy_row = new Row(['id' => 2], $ids);
+    $term_id_map->saveIdMapping($dummy_row, [$map_row['destid1']],
+      $map_row['source_row_status'], MigrateIdMapInterface::ROLLBACK_PRESERVE);
+
+    foreach ($term_data_rows as $row) {
+      /** @var Term $term */
+      $term = Term::load($row['id']);
+      $this->assertTrue($term);
+      $map_row = $term_id_map->getRowBySource(['id' => $row['id']]);
+      $this->assertNotNull($map_row['destid1']);
+    }
+
+    // Add a failed row to test if this can be rolled back without errors.
+    $this->mockFailure($term_migration, ['id' => '4', 'vocab' => '2', 'name' => 'FAIL']);
+
+    // Rollback and verify the entities are gone.
+    $term_executable->rollback();
+    foreach ($term_data_rows as $row) {
+      $term = Term::load($row['id']);
+      if (in_array($row['id'], $preserved_term_ids)) {
+        $this->assertNotNull($term);
+      }
+      else {
+        $this->assertNull($term);
+      }
+      $map_row = $term_id_map->getRowBySource(['id' => $row['id']]);
+      $this->assertFalse($map_row);
+    }
+    $vocabulary_executable->rollback();
+    foreach ($vocabulary_data_rows as $row) {
+      $term = Vocabulary::load($row['id']);
+      $this->assertNull($term);
+      $map_row = $vocabulary_id_map->getRowBySource(['id' => $row['id']]);
+      $this->assertFalse($map_row);
+    }
+
+    // Test that simple configuration is not rollbackable.
+    $term_setting_rows = [
+      ['id' => 1, 'override_selector' => '0', 'terms_per_page_admin' => '10'],
+    ];
+    $ids = ['id' => ['type' => 'integer']];
+    $definition = [
+      'id' => 'taxonomy_settings',
+      'migration_tags' => ['Import and rollback test'],
+      'source' => [
+        'plugin' => 'embedded_data',
+        'data_rows' => $term_setting_rows,
+        'ids' => $ids,
+      ],
+      'process' => [
+        'override_selector' => 'override_selector',
+        'terms_per_page_admin' => 'terms_per_page_admin',
+      ],
+      'destination' => [
+        'plugin' => 'config',
+        'config_name' => 'taxonomy.settings',
+      ],
+      'migration_dependencies' => ['required' => ['vocabularies']],
+    ];
+
+    $settings_migration = \Drupal::service('plugin.manager.migration')->createStubMigration($definition);
+    $this->assertFalse($settings_migration->getDestinationPlugin()->supportsRollback());
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/MigrateSkipRowTest.php

@@ -0,0 +1,102 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel;
+
+use Drupal\KernelTests\KernelTestBase;
+use Drupal\migrate\MigrateMessage;
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate\MigrateExecutable;
+use Drupal\migrate\Plugin\MigrateIdMapInterface;
+
+/**
+ * Tests row skips triggered during hook_migrate_prepare_row().
+ *
+ * @group migrate
+ */
+class MigrateSkipRowTest extends KernelTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['migrate', 'migrate_prepare_row_test'];
+
+  /**
+   * Tests migration interruptions.
+   */
+  public function testPrepareRowSkip() {
+    // Run a simple little migration with two data rows which should be skipped
+    // in different ways.
+    $definition = [
+      'migration_tags' => ['prepare_row test'],
+      'source' => [
+        'plugin' => 'embedded_data',
+        'data_rows' => [
+          ['id' => '1', 'data' => 'skip_and_record'],
+          ['id' => '2', 'data' => 'skip_and_dont_record'],
+        ],
+        'ids' => [
+          'id' => ['type' => 'string'],
+        ],
+      ],
+      'process' => ['value' => 'data'],
+      'destination' => [
+        'plugin' => 'config',
+        'config_name' => 'migrate_test.settings',
+      ],
+      'load' => ['plugin' => 'null'],
+    ];
+
+    $migration = \Drupal::service('plugin.manager.migration')->createStubMigration($definition);
+
+    $executable = new MigrateExecutable($migration, new MigrateMessage());
+    $result = $executable->import();
+    $this->assertEqual($result, MigrationInterface::RESULT_COMPLETED);
+
+    /** @var \Drupal\migrate\Plugin\MigrateIdMapInterface $id_map_plugin */
+    $id_map_plugin = $migration->getIdMap();
+    // The first row is recorded in the map as ignored.
+    $map_row = $id_map_plugin->getRowBySource(['id' => 1]);
+    $this->assertEqual(MigrateIdMapInterface::STATUS_IGNORED, $map_row['source_row_status']);
+    // Check that no message has been logged for the first exception.
+    $messages = $id_map_plugin->getMessageIterator(['id' => 1])->fetchAll();
+    $this->assertEmpty($messages);
+
+    // The second row is not recorded in the map.
+    $map_row = $id_map_plugin->getRowBySource(['id' => 2]);
+    $this->assertFalse($map_row);
+    // Check that the correct message has been logged for the second exception.
+    $messages = $id_map_plugin->getMessageIterator(['id' => 2])->fetchAll();
+    $this->assertCount(1, $messages);
+    $message = reset($messages);
+    $this->assertEquals('skip_and_dont_record message', $message->message);
+    $this->assertEquals(MigrationInterface::MESSAGE_INFORMATIONAL, $message->level);
+
+    // Insert a custom processor in the process flow.
+    $definition['process']['value'] = [
+      'source' => 'data',
+      'plugin' => 'test_skip_row_process',
+    ];
+    // Change data to avoid triggering again hook_migrate_prepare_row().
+    $definition['source']['data_rows'] = [
+      ['id' => '1', 'data' => 'skip_and_record (use plugin)'],
+      ['id' => '2', 'data' => 'skip_and_dont_record (use plugin)'],
+    ];
+    $migration = \Drupal::service('plugin.manager.migration')->createStubMigration($definition);
+
+    $executable = new MigrateExecutable($migration, new MigrateMessage());
+    $result = $executable->import();
+    $this->assertEquals($result, MigrationInterface::RESULT_COMPLETED);
+
+    $id_map_plugin = $migration->getIdMap();
+
+    // The first row is recorded in the map as ignored.
+    $map_row = $id_map_plugin->getRowBySource(['id' => 1]);
+    $this->assertEquals(MigrateIdMapInterface::STATUS_IGNORED, $map_row['source_row_status']);
+    // The second row is not recorded in the map.
+    $map_row = $id_map_plugin->getRowBySource(['id' => 2]);
+    $this->assertFalse($map_row);
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/MigrateSourceTestBase.php

@@ -0,0 +1,180 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel;
+
+use Drupal\KernelTests\KernelTestBase;
+use Drupal\migrate\Plugin\MigrateIdMapInterface;
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate\Row;
+
+/**
+ * Base class for tests of Migrate source plugins.
+ */
+abstract class MigrateSourceTestBase extends KernelTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['migrate'];
+
+  /**
+   * The mocked migration.
+   *
+   * @var MigrationInterface|\Prophecy\Prophecy\ObjectProphecy
+   */
+  protected $migration;
+
+  /**
+   * The source plugin under test.
+   *
+   * @var \Drupal\migrate\Plugin\MigrateSourceInterface
+   */
+  protected $plugin;
+
+  /**
+   * The data provider.
+   *
+   * @see \Drupal\Tests\migrate\Kernel\MigrateSourceTestBase::testSource
+   *
+   * @return array
+   *   Array of data sets to test, each of which is a numerically indexed array
+   *   with the following elements:
+   *   - An array of source data, which can be optionally processed and set up
+   *     by subclasses.
+   *   - An array of expected result rows.
+   *   - (optional) The number of result rows the plugin under test is expected
+   *     to return. If this is not a numeric value, the plugin will not be
+   *     counted.
+   *   - (optional) Array of configuration options for the plugin under test.
+   */
+  abstract public function providerSource();
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    // Create a mock migration. This will be injected into the source plugin
+    // under test.
+    $this->migration = $this->prophesize(MigrationInterface::class);
+
+    $this->migration->id()->willReturn(
+      $this->randomMachineName(16)
+    );
+    // Prophesize a useless ID map plugin and an empty set of destination IDs.
+    // Calling code can override these prophecies later and set up different
+    // behaviors.
+    $this->migration->getIdMap()->willReturn(
+      $this->prophesize(MigrateIdMapInterface::class)->reveal()
+    );
+    $this->migration->getDestinationIds()->willReturn([]);
+  }
+
+  /**
+   * Determines the plugin to be tested by reading the class @covers annotation.
+   *
+   * @return string
+   */
+  protected function getPluginClass() {
+    $annotations = $this->getAnnotations();
+
+    if (isset($annotations['class']['covers'])) {
+      return $annotations['class']['covers'][0];
+    }
+    else {
+      $this->fail('No plugin class was specified');
+    }
+  }
+
+  /**
+   * Instantiates the source plugin under test.
+   *
+   * @param array $configuration
+   *   The source plugin configuration.
+   *
+   * @return \Drupal\migrate\Plugin\MigrateSourceInterface|object
+   *   The fully configured source plugin.
+   */
+  protected function getPlugin(array $configuration) {
+    // Only create the plugin once per test.
+    if ($this->plugin) {
+      return $this->plugin;
+    }
+
+    $class = ltrim($this->getPluginClass(), '\\');
+
+    /** @var \Drupal\migrate\Plugin\MigratePluginManager $plugin_manager */
+    $plugin_manager = $this->container->get('plugin.manager.migrate.source');
+
+    foreach ($plugin_manager->getDefinitions() as $id => $definition) {
+      if (ltrim($definition['class'], '\\') == $class) {
+        $this->plugin = $plugin_manager
+          ->createInstance($id, $configuration, $this->migration->reveal());
+
+        $this->migration
+          ->getSourcePlugin()
+          ->willReturn($this->plugin);
+
+        return $this->plugin;
+      }
+    }
+    $this->fail('No plugin found for class ' . $class);
+  }
+
+  /**
+   * Tests the source plugin against a particular data set.
+   *
+   * @param array $source_data
+   *   The source data that the source plugin will read.
+   * @param array $expected_data
+   *   The result rows the source plugin is expected to return.
+   * @param mixed $expected_count
+   *   (optional) How many rows the source plugin is expected to return.
+   *   Defaults to count($expected_data). If set to a non-null, non-numeric
+   *   value (like FALSE or 'nope'), the source plugin will not be counted.
+   * @param array $configuration
+   *   (optional) Configuration for the source plugin.
+   *
+   * @dataProvider providerSource
+   */
+  public function testSource(array $source_data, array $expected_data, $expected_count = NULL, array $configuration = []) {
+    $plugin = $this->getPlugin($configuration);
+
+    // All source plugins must define IDs.
+    $this->assertNotEmpty($plugin->getIds());
+
+    if (is_null($expected_count)) {
+      $expected_count = count($expected_data);
+    }
+    // If an expected count was given, assert it only if the plugin is
+    // countable.
+    if (is_numeric($expected_count)) {
+      $this->assertInstanceOf('\Countable', $plugin);
+      $this->assertCount($expected_count, $plugin);
+    }
+
+    $i = 0;
+    /** @var \Drupal\migrate\Row $row */
+    foreach ($plugin as $row) {
+      $this->assertInstanceOf(Row::class, $row);
+
+      $expected = $expected_data[$i++];
+      $actual = $row->getSource();
+
+      foreach ($expected as $key => $value) {
+        $this->assertArrayHasKey($key, $actual);
+
+        if (is_array($value)) {
+          ksort($value);
+          ksort($actual[$key]);
+          $this->assertEquals($value, $actual[$key]);
+        }
+        else {
+          $this->assertSame((string) $value, (string) $actual[$key]);
+        }
+      }
+    }
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/MigrateSqlSourceTestBase.php

@@ -0,0 +1,84 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel;
+
+use Drupal\Core\Database\Driver\sqlite\Connection;
+
+/**
+ * Base class for tests of Migrate source plugins that use a database.
+ */
+abstract class MigrateSqlSourceTestBase extends MigrateSourceTestBase {
+
+  /**
+   * Builds an in-memory SQLite database from a set of source data.
+   *
+   * @param array $source_data
+   *   The source data, keyed by table name. Each table is an array containing
+   *   the rows in that table.
+   *
+   * @return \Drupal\Core\Database\Driver\sqlite\Connection
+   *   The SQLite database connection.
+   */
+  protected function getDatabase(array $source_data) {
+    // Create an in-memory SQLite database. Plugins can interact with it like
+    // any other database, and it will cease to exist when the connection is
+    // closed.
+    $connection_options = ['database' => ':memory:'];
+    $pdo = Connection::open($connection_options);
+    $connection = new Connection($pdo, $connection_options);
+
+    // Create the tables and fill them with data.
+    foreach ($source_data as $table => $rows) {
+      // Use the biggest row to build the table schema.
+      $counts = array_map('count', $rows);
+      asort($counts);
+      end($counts);
+      $pilot = $rows[key($counts)];
+
+      $connection->schema()
+        ->createTable($table, [
+          // SQLite uses loose affinity typing, so it's OK for every field to
+          // be a text field.
+          'fields' => array_map(function() { return ['type' => 'text']; }, $pilot),
+        ]);
+
+      $fields = array_keys($pilot);
+      $insert = $connection->insert($table)->fields($fields);
+      array_walk($rows, [$insert, 'values']);
+      $insert->execute();
+    }
+
+    return $connection;
+  }
+
+  /**
+   * Tests the source plugin against a particular data set.
+   *
+   * @param array $source_data
+   *   The source data that the plugin will read. See getDatabase() for the
+   *   expected format.
+   * @param array $expected_data
+   *   The result rows the plugin is expected to return.
+   * @param int $expected_count
+   *   (optional) How many rows the source plugin is expected to return.
+   * @param array $configuration
+   *   (optional) Configuration for the source plugin.
+   *
+   * @dataProvider providerSource
+   *
+   * @requires extension pdo_sqlite
+   */
+  public function testSource(array $source_data, array $expected_data, $expected_count = NULL, array $configuration = []) {
+    $plugin = $this->getPlugin($configuration);
+
+    // Since we don't yet inject the database connection, we need to use a
+    // reflection hack to set it in the plugin instance.
+    $reflector = new \ReflectionObject($plugin);
+    $property = $reflector->getProperty('database');
+    $property->setAccessible(TRUE);
+    $property->setValue($plugin, $this->getDatabase($source_data));
+
+    parent::testSource($source_data, $expected_data, $expected_count, $configuration);
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/MigrateStatusTest.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel;
+
+use Drupal\migrate\Plugin\MigrationInterface;
+
+/**
+ * Tests migration status tracking.
+ *
+ * @group migrate
+ */
+class MigrateStatusTest extends MigrateTestBase {
+
+  /**
+   * Tests different connection types.
+   */
+  public function testStatus() {
+    // Create a minimally valid migration.
+    $definition = [
+      'id' => 'migration_status_test',
+      'migration_tags' => ['Testing'],
+      'source' => ['plugin' => 'empty'],
+      'destination' => [
+        'plugin' => 'config',
+        'config_name' => 'migrate_test.settings',
+      ],
+      'process' => ['foo' => 'bar'],
+    ];
+    $migration = \Drupal::service('plugin.manager.migration')->createStubMigration($definition);
+
+    // Default status is idle.
+    $status = $migration->getStatus();
+    $this->assertIdentical($status, MigrationInterface::STATUS_IDLE);
+
+    // Test setting and retrieving all known status values.
+    $status_list = array(
+      MigrationInterface::STATUS_IDLE,
+      MigrationInterface::STATUS_IMPORTING,
+      MigrationInterface::STATUS_ROLLING_BACK,
+      MigrationInterface::STATUS_STOPPING,
+      MigrationInterface::STATUS_DISABLED,
+    );
+    foreach ($status_list as $status) {
+      $migration->setStatus($status);
+      $this->assertIdentical($migration->getStatus(), $status);
+    }
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/MigrateTestBase.php

@@ -0,0 +1,251 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel;
+
+use Drupal\Core\Database\Database;
+use Drupal\KernelTests\KernelTestBase;
+use Drupal\migrate\MigrateExecutable;
+use Drupal\migrate\MigrateMessageInterface;
+use Drupal\migrate\Plugin\MigrateIdMapInterface;
+use Drupal\migrate\Plugin\Migration;
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate\Row;
+
+/**
+ * Creates abstract base class for migration tests.
+ */
+abstract class MigrateTestBase extends KernelTestBase implements MigrateMessageInterface {
+
+  /**
+   * TRUE to collect messages instead of displaying them.
+   *
+   * @var bool
+   */
+  protected $collectMessages = FALSE;
+
+  /**
+   * A two dimensional array of messages.
+   *
+   * The first key is the type of message, the second is just numeric. Values
+   * are the messages.
+   *
+   * @var array
+   */
+  protected $migrateMessages;
+
+  /**
+   * The primary migration being tested.
+   *
+   * @var \Drupal\migrate\Plugin\MigrationInterface
+   */
+  protected $migration;
+
+  /**
+   * The source database connection.
+   *
+   * @var \Drupal\Core\Database\Connection
+   */
+  protected $sourceDatabase;
+
+  public static $modules = array('migrate');
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    $this->createMigrationConnection();
+    $this->sourceDatabase = Database::getConnection('default', 'migrate');
+  }
+
+  /**
+   * Changes the database connection to the prefixed one.
+   *
+   * @todo Remove when we don't use global. https://www.drupal.org/node/2552791
+   */
+  private function createMigrationConnection() {
+    // If the backup already exists, something went terribly wrong.
+    // This case is possible, because database connection info is a static
+    // global state construct on the Database class, which at least persists
+    // for all test methods executed in one PHP process.
+    if (Database::getConnectionInfo('simpletest_original_migrate')) {
+      throw new \RuntimeException("Bad Database connection state: 'simpletest_original_migrate' connection key already exists. Broken test?");
+    }
+
+    // Clone the current connection and replace the current prefix.
+    $connection_info = Database::getConnectionInfo('migrate');
+    if ($connection_info) {
+      Database::renameConnection('migrate', 'simpletest_original_migrate');
+    }
+    $connection_info = Database::getConnectionInfo('default');
+    foreach ($connection_info as $target => $value) {
+      $prefix = is_array($value['prefix']) ? $value['prefix']['default'] : $value['prefix'];
+      // Simpletest uses 7 character prefixes at most so this can't cause
+      // collisions.
+      $connection_info[$target]['prefix']['default'] = $prefix . '0';
+
+      // Add the original simpletest prefix so SQLite can attach its database.
+      // @see \Drupal\Core\Database\Driver\sqlite\Connection::init()
+      $connection_info[$target]['prefix'][$value['prefix']['default']] = $value['prefix']['default'];
+    }
+    Database::addConnectionInfo('migrate', 'default', $connection_info['default']);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function tearDown() {
+    $this->cleanupMigrateConnection();
+    parent::tearDown();
+    $this->databaseDumpFiles = [];
+    $this->collectMessages = FALSE;
+    unset($this->migration, $this->migrateMessages);
+  }
+
+  /**
+   * Cleans up the test migrate connection.
+   *
+   * @todo Remove when we don't use global. https://www.drupal.org/node/2552791
+   */
+  private function cleanupMigrateConnection() {
+    Database::removeConnection('migrate');
+    $original_connection_info = Database::getConnectionInfo('simpletest_original_migrate');
+    if ($original_connection_info) {
+      Database::renameConnection('simpletest_original_migrate', 'migrate');
+    }
+  }
+
+  /**
+   * Prepare any dependent migrations.
+   *
+   * @param array $id_mappings
+   *   A list of ID mappings keyed by migration IDs. Each ID mapping is a list
+   *   of two arrays, the first are source IDs and the second are destination
+   *   IDs.
+   */
+  protected function prepareMigrations(array $id_mappings) {
+    $manager = $this->container->get('plugin.manager.migration');
+    foreach ($id_mappings as $migration_id => $data) {
+      foreach ($manager->createInstances($migration_id) as $migration) {
+        $id_map = $migration->getIdMap();
+        $id_map->setMessage($this);
+        $source_ids = $migration->getSourcePlugin()->getIds();
+        foreach ($data as $id_mapping) {
+          $row = new Row(array_combine(array_keys($source_ids), $id_mapping[0]), $source_ids);
+          $id_map->saveIdMapping($row, $id_mapping[1]);
+        }
+      }
+    }
+  }
+
+  /**
+   * Modify a migration's configuration before executing it.
+   *
+   * @param \Drupal\migrate\Plugin\MigrationInterface $migration
+   *   The migration to execute.
+   */
+  protected function prepareMigration(MigrationInterface $migration) {
+    // Default implementation for test classes not requiring modification.
+  }
+
+  /**
+   * Executes a single migration.
+   *
+   * @param string|\Drupal\migrate\Plugin\MigrationInterface $migration
+   *   The migration to execute, or its ID.
+   */
+  protected function executeMigration($migration) {
+    if (is_string($migration)) {
+      $this->migration = $this->getMigration($migration);
+    }
+    else {
+      $this->migration = $migration;
+    }
+    if ($this instanceof MigrateDumpAlterInterface) {
+      static::migrateDumpAlter($this);
+    }
+
+    $this->prepareMigration($this->migration);
+    (new MigrateExecutable($this->migration, $this))->import();
+  }
+
+  /**
+   * Executes a set of migrations in dependency order.
+   *
+   * @param string[] $ids
+   *   Array of migration IDs, in any order.
+   */
+  protected function executeMigrations(array $ids) {
+    $manager = $this->container->get('plugin.manager.migration');
+    array_walk($ids, function ($id) use ($manager) {
+      // This is possibly a base plugin ID and we want to run all derivatives.
+      $instances = $manager->createInstances($id);
+      array_walk($instances, [$this, 'executeMigration']);
+    });
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function display($message, $type = 'status') {
+    if ($this->collectMessages) {
+      $this->migrateMessages[$type][] = $message;
+    }
+    else {
+      $this->assert($type == 'status', $message, 'migrate');
+    }
+  }
+
+  /**
+   * Start collecting messages and erase previous messages.
+   */
+  public function startCollectingMessages() {
+    $this->collectMessages = TRUE;
+    $this->migrateMessages = array();
+  }
+
+  /**
+   * Stop collecting messages.
+   */
+  public function stopCollectingMessages() {
+    $this->collectMessages = FALSE;
+  }
+
+  /**
+   * Records a failure in the map table of a specific migration.
+   *
+   * This is done in order to test scenarios which require a failed row.
+   *
+   * @param string|\Drupal\migrate\Plugin\MigrationInterface $migration
+   *   The migration entity, or its ID.
+   * @param array $row
+   *   The raw source row which "failed".
+   * @param int $status
+   *   (optional) The failure status. Should be one of the
+   *   MigrateIdMapInterface::STATUS_* constants. Defaults to
+   *   MigrateIdMapInterface::STATUS_FAILED.
+   */
+  protected function mockFailure($migration, array $row, $status = MigrateIdMapInterface::STATUS_FAILED) {
+    if (is_string($migration)) {
+      $migration = $this->getMigration($migration);
+    }
+    /** @var \Drupal\migrate\Plugin\MigrationInterface $migration */
+    $destination = array_map(function() { return NULL; }, $migration->getDestinationPlugin()->getIds());
+    $row = new Row($row, $migration->getSourcePlugin()->getIds());
+    $migration->getIdMap()->saveIdMapping($row, $destination, $status);
+  }
+
+  /**
+   * Gets the migration plugin.
+   *
+   * @param $plugin_id
+   *   The plugin ID of the migration to get.
+   *
+   * @return \Drupal\migrate\Plugin\Migration
+   *   The migration plugin.
+   */
+  protected function getMigration($plugin_id) {
+    return $this->container->get('plugin.manager.migration')->createInstance($plugin_id);
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/MigrationTest.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel;
+
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * Tests the migration plugin.
+ *
+ * @group migrate
+ *
+ * @coversDefaultClass \Drupal\migrate\Plugin\Migration
+ */
+class MigrationTest extends KernelTestBase {
+
+  /**
+   * Enable field because we are using one of its source plugins.
+   *
+   * @var array
+   */
+  public static $modules = ['migrate', 'field'];
+
+  /**
+   * Tests Migration::set().
+   *
+   * @covers ::set
+   */
+  public function testSetInvalidation() {
+    $migration = \Drupal::service('plugin.manager.migration')->createStubMigration([
+      'source' => ['plugin' => 'empty'],
+      'destination' => ['plugin' => 'entity:entity_view_mode'],
+    ]);
+    $this->assertEqual('empty', $migration->getSourcePlugin()->getPluginId());
+    $this->assertEqual('entity:entity_view_mode', $migration->getDestinationPlugin()->getPluginId());
+
+    // Test the source plugin is invalidated.
+    $migration->set('source', ['plugin' => 'embedded_data', 'data_rows' => [], 'ids' => []]);
+    $this->assertEqual('embedded_data', $migration->getSourcePlugin()->getPluginId());
+
+    // Test the destination plugin is invalidated.
+    $migration->set('destination', ['plugin' => 'null']);
+    $this->assertEqual('null', $migration->getDestinationPlugin()->getPluginId());
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/Plugin/MigrationPluginConfigurationTest.php

@@ -0,0 +1,76 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel\Plugin;
+
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * Tests the migration plugin manager.
+ *
+ * @coversDefaultClass \Drupal\migrate\Plugin\MigratePluginManager
+ * @group migrate
+ */
+class MigrationPluginConfigurationTest extends KernelTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = [
+    'migrate',
+    'migrate_drupal',
+    // Test with a simple migration.
+    'ban',
+  ];
+
+  /**
+   * Test merging configuration into a plugin through the plugin manager.
+   *
+   * @dataProvider mergeProvider
+   */
+  public function testConfigurationMerge($configuration, $expected) {
+    /** @var \Drupal\migrate\Plugin\MigrationInterface $migration */
+    $migration = $this->container->get('plugin.manager.migration')->createInstance('d7_blocked_ips', $configuration);
+    $source_configuration = $migration->getSourceConfiguration();
+    $this->assertEquals($expected, $source_configuration);
+  }
+
+  /**
+   * Provide configuration data for testing.
+   */
+  public function mergeProvider() {
+    return [
+      // Tests adding new configuration to a migration.
+      [
+        // New configuration.
+        [
+          'source' => [
+            'constants' => [
+              'added_setting' => 'Ban them all!',
+            ],
+          ],
+        ],
+        // Expected final source configuration.
+        [
+          'plugin' => 'd7_blocked_ips',
+          'constants' => [
+            'added_setting' => 'Ban them all!',
+          ],
+        ],
+      ],
+      // Tests overriding pre-existing configuration in a migration.
+      [
+        // New configuration.
+        [
+          'source' => [
+            'plugin' => 'a_different_plugin',
+          ],
+        ],
+        // Expected final source configuration.
+        [
+          'plugin' => 'a_different_plugin',
+        ],
+      ],
+    ];
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/Plugin/MigrationPluginListTest.php

@@ -0,0 +1,106 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel\Plugin;
+
+use Drupal\Core\Database\Database;
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * Tests the migration plugin manager.
+ *
+ * @coversDefaultClass \Drupal\migrate\Plugin\MigratePluginManager
+ * @group migrate
+ */
+class MigrationPluginListTest extends KernelTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = [
+    'migrate',
+    // Test with all modules containing Drupal migrations.
+    'action',
+    'aggregator',
+    'ban',
+    'block',
+    'block_content',
+    'book',
+    'comment',
+    'contact',
+    'dblog',
+    'field',
+    'file',
+    'filter',
+    'forum',
+    'image',
+    'language',
+    'locale',
+    'menu_link_content',
+    'menu_ui',
+    'node',
+    'path',
+    'search',
+    'shortcut',
+    'simpletest',
+    'statistics',
+    'syslog',
+    'system',
+    'taxonomy',
+    'text',
+    'tracker',
+    'update',
+    'user',
+  ];
+
+  /**
+   * @covers ::getDefinitions
+   */
+  public function testGetDefinitions() {
+    // Make sure retrieving all the core migration plugins does not throw any
+    // errors.
+    $migration_plugins = $this->container->get('plugin.manager.migration')->getDefinitions();
+    // All the plugins provided by core depend on migrate_drupal.
+    $this->assertEmpty($migration_plugins);
+
+    // Enable a module that provides migrations that do not depend on
+    // migrate_drupal.
+    $this->enableModules(['migrate_external_translated_test']);
+    $migration_plugins = $this->container->get('plugin.manager.migration')->getDefinitions();
+    // All the plugins provided by migrate_external_translated_test do not
+    // depend on migrate_drupal.
+    $this::assertArrayHasKey('external_translated_test_node', $migration_plugins);
+    $this::assertArrayHasKey('external_translated_test_node_translation', $migration_plugins);
+
+    // Disable the test module and the list should be empty again.
+    $this->disableModules(['migrate_external_translated_test']);
+    $migration_plugins = $this->container->get('plugin.manager.migration')->getDefinitions();
+    // All the plugins provided by core depend on migrate_drupal.
+    $this->assertEmpty($migration_plugins);
+
+    // Enable migrate_drupal to test that the plugins can now be discovered.
+    $this->enableModules(['migrate_drupal']);
+    // Set up a migrate database connection so that plugin discovery works.
+    // Clone the current connection and replace the current prefix.
+    $connection_info = Database::getConnectionInfo('migrate');
+    if ($connection_info) {
+      Database::renameConnection('migrate', 'simpletest_original_migrate');
+    }
+    $connection_info = Database::getConnectionInfo('default');
+    foreach ($connection_info as $target => $value) {
+      $prefix = is_array($value['prefix']) ? $value['prefix']['default'] : $value['prefix'];
+      // Simpletest uses 7 character prefixes at most so this can't cause
+      // collisions.
+      $connection_info[$target]['prefix']['default'] = $prefix . '0';
+
+      // Add the original simpletest prefix so SQLite can attach its database.
+      // @see \Drupal\Core\Database\Driver\sqlite\Connection::init()
+      $connection_info[$target]['prefix'][$value['prefix']['default']] = $value['prefix']['default'];
+    }
+    Database::addConnectionInfo('migrate', 'default', $connection_info['default']);
+
+    $migration_plugins = $this->container->get('plugin.manager.migration')->getDefinitions();
+    // All the plugins provided by core depend on migrate_drupal.
+    $this->assertNotEmpty($migration_plugins);
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/Plugin/MigrationTest.php

@@ -0,0 +1,84 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel\Plugin;
+
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * Tests the migration plugin.
+ *
+ * @coversDefaultClass \Drupal\migrate\Plugin\Migration
+ * @group migrate
+ */
+class MigrationTest extends KernelTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['migrate'];
+
+  /**
+   * Tests Migration::getProcessPlugins()
+   *
+   * @covers ::getProcessPlugins
+   */
+  public function testGetProcessPlugins() {
+    $migration = \Drupal::service('plugin.manager.migration')->createStubMigration([]);
+    $this->assertEquals([], $migration->getProcessPlugins([]));
+  }
+
+  /**
+   * Tests Migration::getMigrationDependencies()
+   *
+   * @covers ::getMigrationDependencies
+   */
+  public function testGetMigrationDependencies() {
+    $plugin_manager = \Drupal::service('plugin.manager.migration');
+    $plugin_definition = [
+      'process' => [
+        'f1' => 'bar',
+        'f2' => [
+          'plugin' => 'migration',
+          'migration' => 'm1'
+        ],
+        'f3' => [
+          'plugin' => 'iterator',
+          'process' => [
+            'target_id' => [
+              'plugin' => 'migration',
+              'migration' => 'm2',
+            ],
+          ],
+        ],
+      ],
+    ];
+    $migration = $plugin_manager->createStubMigration($plugin_definition);
+    $this->assertSame(['required' => [], 'optional' => ['m1', 'm2']], $migration->getMigrationDependencies());
+  }
+
+  /**
+   * Tests Migration::getDestinationIds()
+   *
+   * @covers ::getDestinationIds
+   */
+  public function testGetDestinationIds() {
+    $migration = \Drupal::service('plugin.manager.migration')->createStubMigration(['destinationIds' => ['foo' => 'bar']]);
+    $destination_ids = $migration->getDestinationIds();
+    $this->assertNotEmpty($destination_ids, 'Destination ids are not empty');
+    $this->assertEquals(['foo' => 'bar'], $destination_ids, 'Destination ids match the expected values.');
+  }
+
+  /**
+   * Tests Migration::getTrackLastImported()
+   *
+   * @covers ::getTrackLastImported
+   * @covers ::isTrackLastImported
+   */
+  public function testGetTrackLastImported() {
+    $migration = \Drupal::service('plugin.manager.migration')->createStubMigration([]);
+    $migration->setTrackLastImported(TRUE);
+    $this->assertEquals(TRUE, $migration->getTrackLastImported());
+    $this->assertEquals(TRUE, $migration->isTrackLastImported());
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/QueryBatchTest.php

@@ -0,0 +1,261 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel;
+
+use Drupal\KernelTests\KernelTestBase;
+use Drupal\migrate\MigrateException;
+use Drupal\migrate\Plugin\MigrateIdMapInterface;
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\Core\Database\Driver\sqlite\Connection;
+
+/**
+ * Tests query batching.
+ *
+ * @covers \Drupal\migrate_query_batch_test\Plugin\migrate\source\QueryBatchTest
+ * @group migrate
+ */
+class QueryBatchTest extends KernelTestBase {
+
+  /**
+   * The mocked migration.
+   *
+   * @var MigrationInterface|\Prophecy\Prophecy\ObjectProphecy
+   */
+  protected $migration;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = [
+    'migrate',
+    'migrate_query_batch_test',
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    // Create a mock migration. This will be injected into the source plugin
+    // under test.
+    $this->migration = $this->prophesize(MigrationInterface::class);
+
+    $this->migration->id()->willReturn(
+      $this->randomMachineName(16)
+    );
+    // Prophesize a useless ID map plugin and an empty set of destination IDs.
+    // Calling code can override these prophecies later and set up different
+    // behaviors.
+    $this->migration->getIdMap()->willReturn(
+      $this->prophesize(MigrateIdMapInterface::class)->reveal()
+    );
+    $this->migration->getDestinationIds()->willReturn([]);
+  }
+
+  /**
+   * Tests a negative batch size throws an exception.
+   */
+  public function testBatchSizeNegative() {
+    $this->setExpectedException(MigrateException::class, 'batch_size must be greater than or equal to zero');
+    $plugin = $this->getPlugin(['batch_size' => -1]);
+    $plugin->next();
+  }
+
+  /**
+   * Tests a non integer batch size throws an exception.
+   */
+  public function testBatchSizeNonInteger() {
+    $this->setExpectedException(MigrateException::class, 'batch_size must be greater than or equal to zero');
+    $plugin = $this->getPlugin(['batch_size' => '1']);
+    $plugin->next();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function queryDataProvider() {
+    // Define the parameters for building the data array. The first element is
+    // the number of source data rows, the second is the batch size to set on
+    // the plugin configuration.
+    $test_parameters = [
+      // Test when batch size is 0.
+      [200, 0],
+      // Test when rows mod batch size is 0.
+      [200, 20],
+      // Test when rows mod batch size is > 0.
+      [200, 30],
+      // Test when batch size = row count.
+      [200, 200],
+      // Test when batch size > row count.
+      [200, 300],
+    ];
+
+    // Build the data provider array. The provider array consists of the source
+    // data rows, the expected result data, the expected count, the plugin
+    // configuration, the expected batch size and the expected batch count.
+    $table = 'query_batch_test';
+    $tests = [];
+    $data_set = 0;
+    foreach ($test_parameters as $data) {
+      list($num_rows, $batch_size) = $data;
+      for ($i = 0; $i < $num_rows; $i++) {
+        $tests[$data_set]['source_data'][$table][] = [
+          'id' => $i,
+          'data' => $this->randomString(),
+        ];
+      }
+      $tests[$data_set]['expected_data'] = $tests[$data_set]['source_data'][$table];
+      $tests[$data_set][2] = $num_rows;
+      // Plugin configuration array.
+      $tests[$data_set][3] = ['batch_size' => $batch_size];
+      // Expected batch size.
+      $tests[$data_set][4] = $batch_size;
+      // Expected batch count is 0 unless a batch size is set.
+      $expected_batch_count = 0;
+      if ($batch_size > 0) {
+        $expected_batch_count = (int) ($num_rows / $batch_size);
+        if ($num_rows % $batch_size) {
+          // If there is a remainder an extra batch is needed to get the
+          // remaining rows.
+          $expected_batch_count++;
+        }
+      }
+      $tests[$data_set][5] = $expected_batch_count;
+      $data_set++;
+    }
+    return $tests;
+  }
+
+  /**
+   * Tests query batch size.
+   *
+   * @param array $source_data
+   *   The source data, keyed by table name. Each table is an array containing
+   *   the rows in that table.
+   * @param array $expected_data
+   *   The result rows the plugin is expected to return.
+   * @param int $num_rows
+   *   How many rows the source plugin is expected to return.
+   * @param array $configuration
+   *   Configuration for the source plugin specifying the batch size.
+   * @param int $expected_batch_size
+   *   The expected batch size, will be set to zero for invalid batch sizes.
+   * @param int $expected_batch_count
+   *   The total number of batches.
+   *
+   * @dataProvider queryDataProvider
+   */
+  public function testQueryBatch($source_data, $expected_data, $num_rows, $configuration, $expected_batch_size, $expected_batch_count) {
+    $plugin = $this->getPlugin($configuration);
+
+    // Since we don't yet inject the database connection, we need to use a
+    // reflection hack to set it in the plugin instance.
+    $reflector = new \ReflectionObject($plugin);
+    $property = $reflector->getProperty('database');
+    $property->setAccessible(TRUE);
+
+    $connection = $this->getDatabase($source_data);
+    $property->setValue($plugin, $connection);
+
+    // Test the results.
+    $i = 0;
+    /** @var \Drupal\migrate\Row $row */
+    foreach ($plugin as $row) {
+
+      $expected = $expected_data[$i++];
+      $actual = $row->getSource();
+
+      foreach ($expected as $key => $value) {
+        $this->assertArrayHasKey($key, $actual);
+        $this->assertSame((string) $value, (string) $actual[$key]);
+      }
+    }
+
+    // Test that all rows were retrieved.
+    self::assertSame($num_rows, $i);
+
+    // Test the batch size.
+    if (is_null($expected_batch_size)) {
+      $expected_batch_size = $configuration['batch_size'];
+    }
+    $property = $reflector->getProperty('batchSize');
+    $property->setAccessible(TRUE);
+    self::assertSame($expected_batch_size, $property->getValue($plugin));
+
+    // Test the batch count.
+    if (is_null($expected_batch_count)) {
+      $expected_batch_count = intdiv($num_rows, $expected_batch_size);
+      if ($num_rows % $configuration['batch_size']) {
+        $expected_batch_count++;
+      }
+    }
+    $property = $reflector->getProperty('batch');
+    $property->setAccessible(TRUE);
+    self::assertSame($expected_batch_count, $property->getValue($plugin));
+  }
+
+  /**
+   * Instantiates the source plugin under test.
+   *
+   * @param array $configuration
+   *   The source plugin configuration.
+   *
+   * @return \Drupal\migrate\Plugin\MigrateSourceInterface|object
+   *   The fully configured source plugin.
+   */
+  protected function getPlugin($configuration) {
+    /** @var \Drupal\migrate\Plugin\MigratePluginManager $plugin_manager */
+    $plugin_manager = $this->container->get('plugin.manager.migrate.source');
+    $plugin = $plugin_manager->createInstance('query_batch_test', $configuration, $this->migration->reveal());
+
+    $this->migration
+      ->getSourcePlugin()
+      ->willReturn($plugin);
+    return $plugin;
+  }
+
+  /**
+   * Builds an in-memory SQLite database from a set of source data.
+   *
+   * @param array $source_data
+   *   The source data, keyed by table name. Each table is an array containing
+   *   the rows in that table.
+   *
+   * @return \Drupal\Core\Database\Driver\sqlite\Connection
+   *   The SQLite database connection.
+   */
+  protected function getDatabase(array $source_data) {
+    // Create an in-memory SQLite database. Plugins can interact with it like
+    // any other database, and it will cease to exist when the connection is
+    // closed.
+    $connection_options = ['database' => ':memory:'];
+    $pdo = Connection::open($connection_options);
+    $connection = new Connection($pdo, $connection_options);
+
+    // Create the tables and fill them with data.
+    foreach ($source_data as $table => $rows) {
+      // Use the biggest row to build the table schema.
+      $counts = array_map('count', $rows);
+      asort($counts);
+      end($counts);
+      $pilot = $rows[key($counts)];
+
+      $connection->schema()
+        ->createTable($table, [
+          // SQLite uses loose affinity typing, so it's OK for every field to
+          // be a text field.
+          'fields' => array_map(function () {
+            return ['type' => 'text'];
+          }, $pilot),
+        ]);
+
+      $fields = array_keys($pilot);
+      $insert = $connection->insert($table)->fields($fields);
+      array_walk($rows, [$insert, 'values']);
+      $insert->execute();
+    }
+    return $connection;
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/SqlBaseTest.php

@@ -0,0 +1,138 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\migrate\Kernel\SqlBaseTest.
+ */
+
+namespace Drupal\Tests\migrate\Kernel;
+
+use Drupal\migrate\Plugin\migrate\source\TestSqlBase;
+use Drupal\Core\Database\Database;
+
+/**
+ * Tests the functionality of SqlBase.
+ *
+ * @group migrate
+ */
+class SqlBaseTest extends MigrateTestBase {
+
+  /**
+   * Tests different connection types.
+   */
+  public function testConnectionTypes() {
+    $sql_base = new TestSqlBase();
+
+    // Check the default values.
+    $sql_base->setConfiguration([]);
+    $this->assertIdentical($sql_base->getDatabase()->getTarget(), 'default');
+    $this->assertIdentical($sql_base->getDatabase()->getKey(), 'migrate');
+
+    $target = 'test_db_target';
+    $key = 'test_migrate_connection';
+    $config = array('target' => $target, 'key' => $key);
+    $sql_base->setConfiguration($config);
+    Database::addConnectionInfo($key, $target, Database::getConnectionInfo('default')['default']);
+
+    // Validate we have injected our custom key and target.
+    $this->assertIdentical($sql_base->getDatabase()->getTarget(), $target);
+    $this->assertIdentical($sql_base->getDatabase()->getKey(), $key);
+
+    // Now test we can have SqlBase create the connection from an info array.
+    $sql_base = new TestSqlBase();
+
+    $target = 'test_db_target2';
+    $key = 'test_migrate_connection2';
+    $database = Database::getConnectionInfo('default')['default'];
+    $config = array('target' => $target, 'key' => $key, 'database' => $database);
+    $sql_base->setConfiguration($config);
+
+    // Call getDatabase() to get the connection defined.
+    $sql_base->getDatabase();
+
+    // Validate the connection has been created with the right values.
+    $this->assertIdentical(Database::getConnectionInfo($key)[$target], $database);
+
+    // Now, test this all works when using state to store db info.
+    $target = 'test_state_db_target';
+    $key = 'test_state_migrate_connection';
+    $config = ['target' => $target, 'key' => $key];
+    $database_state_key = 'migrate_sql_base_test';
+    \Drupal::state()->set($database_state_key, $config);
+    $sql_base->setConfiguration(['database_state_key' => $database_state_key]);
+    Database::addConnectionInfo($key, $target, Database::getConnectionInfo('default')['default']);
+
+    // Validate we have injected our custom key and target.
+    $this->assertIdentical($sql_base->getDatabase()->getTarget(), $target);
+    $this->assertIdentical($sql_base->getDatabase()->getKey(), $key);
+
+    // Now test we can have SqlBase create the connection from an info array.
+    $sql_base = new TestSqlBase();
+
+    $target = 'test_state_db_target2';
+    $key = 'test_state_migrate_connection2';
+    $database = Database::getConnectionInfo('default')['default'];
+    $config = ['target' => $target, 'key' => $key, 'database' => $database];
+    $database_state_key = 'migrate_sql_base_test2';
+    \Drupal::state()->set($database_state_key, $config);
+    $sql_base->setConfiguration(['database_state_key' => $database_state_key]);
+
+    // Call getDatabase() to get the connection defined.
+    $sql_base->getDatabase();
+
+    // Validate the connection has been created with the right values.
+    $this->assertIdentical(Database::getConnectionInfo($key)[$target], $database);
+  }
+
+}
+
+namespace Drupal\migrate\Plugin\migrate\source;
+
+/**
+ * A dummy source to help with testing SqlBase.
+ *
+ * @package Drupal\migrate\Plugin\migrate\source
+ */
+class TestSqlBase extends SqlBase {
+
+  /**
+   * Overrides the constructor so we can create one easily.
+   */
+  public function __construct() {
+    $this->state = \Drupal::state();
+  }
+
+  /**
+   * Gets the database without caching it.
+   */
+  public function getDatabase() {
+    $this->database = NULL;
+    return parent::getDatabase();
+  }
+
+  /**
+   * Allows us to set the configuration from a test.
+   *
+   * @param array $config
+   *   The config array.
+   */
+  public function setConfiguration($config) {
+    $this->configuration = $config;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getIds() {}
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fields() {}
+
+  /**
+   * {@inheritdoc}
+   */
+  public function query() {}
+
+}

web/core/modules/migrate/tests/src/Kernel/process/CopyFileTest.php

@@ -0,0 +1,218 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel\process;
+
+use Drupal\Core\StreamWrapper\StreamWrapperInterface;
+use Drupal\KernelTests\KernelTestBase;
+use Drupal\migrate\MigrateExecutableInterface;
+use Drupal\migrate\Plugin\migrate\process\FileCopy;
+use Drupal\migrate\Row;
+
+/**
+ * Tests the copy_file process plugin.
+ *
+ * @group migrate
+ */
+class CopyFileTest extends KernelTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['migrate', 'system'];
+
+  /**
+   * The file system service.
+   *
+   * @var \Drupal\Core\File\FileSystemInterface
+   */
+  protected $fileSystem;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    $this->fileSystem = $this->container->get('file_system');
+    $this->container->get('stream_wrapper_manager')->registerWrapper('temporary', 'Drupal\Core\StreamWrapper\TemporaryStream', StreamWrapperInterface::LOCAL_NORMAL);
+  }
+
+  /**
+   * Test successful imports/copies.
+   */
+  public function testSuccessfulCopies() {
+    $file = $this->createUri(NULL, NULL, 'temporary');
+    $file_absolute = $this->fileSystem->realpath($file);
+    $data_sets = [
+      // Test a local to local copy.
+      [
+        $this->root . '/core/modules/simpletest/files/image-test.jpg',
+        'public://file1.jpg'
+      ],
+      // Test a temporary file using an absolute path.
+      [
+        $file_absolute,
+        'temporary://test.jpg'
+      ],
+      // Test a temporary file using a relative path.
+      [
+        $file_absolute,
+        'temporary://core/modules/simpletest/files/test.jpg'
+      ],
+    ];
+    foreach ($data_sets as $data) {
+      list($source_path, $destination_path) = $data;
+      $actual_destination = $this->doImport($source_path, $destination_path);
+      $message = sprintf('File %s exists', $destination_path);
+      $this->assertFileExists($destination_path, $message);
+      // Make sure we didn't accidentally do a move.
+      $this->assertFileExists($source_path, $message);
+      $this->assertSame($actual_destination, $destination_path, 'The import returned the copied filename.');
+    }
+  }
+
+  /**
+   * Test successful file reuse.
+   */
+  public function testSuccessfulReuse() {
+    $source_path = $this->root . '/core/modules/simpletest/files/image-test.jpg';
+    $destination_path = 'public://file1.jpg';
+    $file_reuse = file_unmanaged_copy($source_path, $destination_path);
+    $timestamp = (new \SplFileInfo($file_reuse))->getMTime();
+    $this->assertInternalType('int', $timestamp);
+
+    // We need to make sure the modified timestamp on the file is sooner than
+    // the attempted migration.
+    sleep(1);
+    $configuration = ['reuse' => TRUE];
+    $this->doImport($source_path, $destination_path, $configuration);
+    clearstatcache(TRUE, $destination_path);
+    $modified_timestamp = (new \SplFileInfo($destination_path))->getMTime();
+    $this->assertEquals($timestamp, $modified_timestamp);
+
+    $configuration = ['reuse' => FALSE];
+    $this->doImport($source_path, $destination_path, $configuration);
+    clearstatcache(TRUE, $destination_path);
+    $modified_timestamp = (new \SplFileInfo($destination_path))->getMTime();
+    $this->assertGreaterThan($timestamp, $modified_timestamp);
+  }
+
+  /**
+   * Test successful moves.
+   */
+  public function testSuccessfulMoves() {
+    $file_1 = $this->createUri(NULL, NULL, 'temporary');
+    $file_1_absolute = $this->fileSystem->realpath($file_1);
+    $file_2 = $this->createUri(NULL, NULL, 'temporary');
+    $file_2_absolute = $this->fileSystem->realpath($file_2);
+    $local_file = $this->createUri(NULL, NULL, 'public');
+    $data_sets = [
+      // Test a local to local copy.
+      [
+        $local_file,
+        'public://file1.jpg'
+      ],
+      // Test a temporary file using an absolute path.
+      [
+        $file_1_absolute,
+        'temporary://test.jpg'
+      ],
+      // Test a temporary file using a relative path.
+      [
+        $file_2_absolute,
+        'temporary://core/modules/simpletest/files/test.jpg'
+      ],
+    ];
+    foreach ($data_sets as $data) {
+      list($source_path, $destination_path) = $data;
+      $actual_destination = $this->doImport($source_path, $destination_path, ['move' => TRUE]);
+      $message = sprintf('File %s exists', $destination_path);
+      $this->assertFileExists($destination_path, $message);
+      $message = sprintf('File %s does not exist', $source_path);
+      $this->assertFileNotExists($source_path, $message);
+      $this->assertSame($actual_destination, $destination_path, 'The importer returned the moved filename.');
+    }
+  }
+
+  /**
+   * Test that non-existent files throw an exception.
+   *
+   * @expectedException \Drupal\migrate\MigrateException
+   *
+   * @expectedExceptionMessage File '/non/existent/file' does not exist
+   */
+  public function testNonExistentSourceFile() {
+    $source = '/non/existent/file';
+    $this->doImport($source, 'public://wontmatter.jpg');
+  }
+
+  /**
+   * Test the 'rename' overwrite mode.
+   */
+  public function testRenameFile() {
+    $source = $this->createUri(NULL, NULL, 'temporary');
+    $destination = $this->createUri('foo.txt', NULL, 'public');
+    $expected_destination = 'public://foo_0.txt';
+    $actual_destination = $this->doImport($source, $destination, ['rename' => TRUE]);
+    $this->assertFileExists($expected_destination, 'File was renamed on import');
+    $this->assertSame($actual_destination, $expected_destination, 'The importer returned the renamed filename.');
+  }
+
+  /**
+   * Do an import using the destination.
+   *
+   * @param string $source_path
+   *   Source path to copy from.
+   * @param string $destination_path
+   *   The destination path to copy to.
+   * @param array $configuration
+   *   Process plugin configuration settings.
+   *
+   * @throws \Drupal\migrate\MigrateException
+   */
+  protected function doImport($source_path, $destination_path, $configuration = []) {
+    $plugin = FileCopy::create($this->container, $configuration, 'file_copy', []);
+    $executable = $this->prophesize(MigrateExecutableInterface::class)->reveal();
+    $row = new Row();
+
+    $result = $plugin->transform([$source_path, $destination_path], $executable, $row, 'foobaz');
+
+    // Return the imported file Uri.
+    return $result;
+  }
+
+  /**
+   * Create a file and return the URI of it.
+   *
+   * @param $filepath
+   *   Optional string specifying the file path. If none is provided then a
+   *   randomly named file will be created in the site's files directory.
+   * @param $contents
+   *   Optional contents to save into the file. If a NULL value is provided an
+   *   arbitrary string will be used.
+   * @param $scheme
+   *   Optional string indicating the stream scheme to use. Drupal core includes
+   *   public, private, and temporary. The public wrapper is the default.
+   * @return
+   *   File URI.
+   */
+  protected function createUri($filepath = NULL, $contents = NULL, $scheme = NULL) {
+    if (!isset($filepath)) {
+      // Prefix with non-latin characters to ensure that all file-related
+      // tests work with international filenames.
+      $filepath = 'Файл для тестирования ' . $this->randomMachineName();
+    }
+    if (empty($scheme)) {
+      $scheme = file_default_scheme();
+    }
+    $filepath = $scheme . '://' . $filepath;
+
+    if (empty($contents)) {
+      $contents = "file_put_contents() doesn't seem to appreciate empty strings so let's put in some data.";
+    }
+
+    file_put_contents($filepath, $contents);
+    $this->assertFileExists($filepath, t('The test file exists on the disk.'));
+    return $filepath;
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/process/DownloadTest.php

@@ -0,0 +1,128 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel\process;
+
+use Drupal\Core\StreamWrapper\StreamWrapperInterface;
+use Drupal\KernelTests\Core\File\FileTestBase;
+use Drupal\migrate\MigrateException;
+use Drupal\migrate\Plugin\migrate\process\Download;
+use Drupal\migrate\MigrateExecutableInterface;
+use Drupal\migrate\Row;
+use GuzzleHttp\Client;
+use GuzzleHttp\Psr7\Response;
+
+/**
+ * Tests the download process plugin.
+ *
+ * @group migrate
+ */
+class DownloadTest extends FileTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['system'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    $this->container->get('stream_wrapper_manager')->registerWrapper('temporary', 'Drupal\Core\StreamWrapper\TemporaryStream', StreamWrapperInterface::LOCAL_NORMAL);
+  }
+
+  /**
+   * Tests a download that overwrites an existing local file.
+   */
+  public function testOverwritingDownload() {
+    // Create a pre-existing file at the destination, to test overwrite behavior.
+    $destination_uri = $this->createUri('existing_file.txt');
+
+    // Test destructive download.
+    $actual_destination = $this->doTransform($destination_uri);
+    $this->assertSame($destination_uri, $actual_destination, 'Import returned a destination that was not renamed');
+    $this->assertFileNotExists('public://existing_file_0.txt', 'Import did not rename the file');
+  }
+
+  /**
+   * Tests a download that renames the downloaded file if there's a collision.
+   */
+  public function testNonDestructiveDownload() {
+    // Create a pre-existing file at the destination, to test overwrite behavior.
+    $destination_uri = $this->createUri('another_existing_file.txt');
+
+    // Test non-destructive download.
+    $actual_destination = $this->doTransform($destination_uri, ['rename' => TRUE]);
+    $this->assertSame('public://another_existing_file_0.txt', $actual_destination, 'Import returned a renamed destination');
+    $this->assertFileExists($actual_destination, 'Downloaded file was created');
+  }
+
+  /**
+   * Tests that an exception is thrown if the destination URI is not writable.
+   */
+  public function testWriteProtectedDestination() {
+    // Create a pre-existing file at the destination, to test overwrite behavior.
+    $destination_uri = $this->createUri('not-writable.txt');
+
+    // Make the destination non-writable.
+    $this->container
+      ->get('file_system')
+      ->chmod($destination_uri, 0444);
+
+    // Pass or fail, we'll need to make the file writable again so the test
+    // can clean up after itself.
+    $fix_permissions = function () use ($destination_uri) {
+      $this->container
+        ->get('file_system')
+        ->chmod($destination_uri, 0755);
+    };
+
+    try {
+      $this->doTransform($destination_uri);
+      $fix_permissions();
+      $this->fail('MigrateException was not thrown for non-writable destination URI.');
+    }
+    catch (MigrateException $e) {
+      $this->assertTrue(TRUE, 'MigrateException was thrown for non-writable destination URI.');
+      $fix_permissions();
+    }
+  }
+
+  /**
+   * Runs an input value through the download plugin.
+   *
+   * @param string $destination_uri
+   *   The destination URI to download to.
+   * @param array $configuration
+   *   (optional) Configuration for the download plugin.
+   *
+   * @return string
+   *   The local URI of the downloaded file.
+   */
+  protected function doTransform($destination_uri, $configuration = []) {
+    // The HTTP client will return a file with contents 'It worked!'
+    $body = fopen('data://text/plain;base64,SXQgd29ya2VkIQ==', 'r');
+
+    // Prepare a mock HTTP client.
+    $this->container->set('http_client', $this->getMock(Client::class));
+    $this->container->get('http_client')
+      ->method('get')
+      ->willReturn(new Response(200, [], $body));
+
+    // Instantiate the plugin statically so it can pull dependencies out of
+    // the container.
+    $plugin = Download::create($this->container, $configuration, 'download', []);
+
+    // Execute the transformation.
+    $executable = $this->getMock(MigrateExecutableInterface::class);
+    $row = new Row([], []);
+
+    // Return the downloaded file's local URI.
+    $value = [
+      'http://drupal.org/favicon.ico',
+      $destination_uri,
+    ];
+    return $plugin->transform($value, $executable, $row, 'foobaz');
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/process/ExtractTest.php

@@ -0,0 +1,111 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel\process;
+
+use Drupal\KernelTests\KernelTestBase;
+use Drupal\migrate\MigrateExecutable;
+use Drupal\migrate\MigrateMessage;
+use Drupal\migrate\Plugin\MigrationInterface;
+
+/**
+ * Tests the extract process plugin.
+ *
+ * @group migrate
+ */
+class ExtractTest extends KernelTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['migrate'];
+
+  /**
+   * Returns test migration definition.
+   *
+   * @return array
+   */
+  public function getDefinition() {
+    return [
+      'source' => [
+        'plugin' => 'embedded_data',
+        'data_rows' => [],
+        'ids' => [
+          'id' => ['type' => 'string'],
+        ],
+      ],
+      'process' => [
+        'first' => [
+          'plugin' => 'extract',
+          'index' => [0],
+          'source' => 'simple_array',
+        ],
+        'second' => [
+          'plugin' => 'extract',
+          'index' => [1],
+          'source' => 'complex_array',
+        ],
+      ],
+      'destination' => [
+        'plugin' => 'config',
+        'config_name' => 'migrate_test.settings',
+      ],
+    ];
+  }
+
+  /**
+   * Tests multiple value handling.
+   *
+   * @dataProvider multipleValueProviderSource
+   *
+   * @param array $source_data
+   * @param array $expected_data
+   */
+  public function testMultipleValueExplode(array $source_data, array $expected_data) {
+    $definition = $this->getDefinition();
+    $definition['source']['data_rows'] = [$source_data];
+
+    $migration = \Drupal::service('plugin.manager.migration')->createStubMigration($definition);
+
+    $executable = new MigrateExecutable($migration, new MigrateMessage());
+    $result = $executable->import();
+
+    // Migration needs to succeed before further assertions are made.
+    $this->assertSame(MigrationInterface::RESULT_COMPLETED, $result);
+
+    // Compare with expected data.
+    $this->assertEquals($expected_data, \Drupal::config('migrate_test.settings')->get());
+  }
+
+  /**
+   * Provides multiple source data for "extract" process plugin test.
+   */
+  public function multipleValueProviderSource() {
+    $tests = [
+      [
+        'source_data' => [
+          'id' => '1',
+          'simple_array' => ['alpha', 'beta'],
+          'complex_array' => [['alpha', 'beta'], ['psi', 'omega']],
+        ],
+        'expected_data' => [
+          'first' => 'alpha',
+          'second' => ['psi', 'omega'],
+        ],
+      ],
+      [
+        'source_data' => [
+          'id' => '2',
+          'simple_array' => ['one'],
+          'complex_array' => [0, 1],
+        ],
+        'expected_data' => [
+          'first' => 'one',
+          'second' => 1,
+        ],
+      ],
+    ];
+
+    return $tests;
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/process/FileCopyTest.php

@@ -0,0 +1,209 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel\process;
+
+use Drupal\Core\StreamWrapper\StreamWrapperInterface;
+use Drupal\KernelTests\Core\File\FileTestBase;
+use Drupal\migrate\MigrateException;
+use Drupal\migrate\Plugin\migrate\process\FileCopy;
+use Drupal\migrate\MigrateExecutableInterface;
+use Drupal\migrate\Plugin\MigrateProcessInterface;
+use Drupal\migrate\Row;
+
+/**
+ * Tests the file_copy process plugin.
+ *
+ * @coversDefaultClass \Drupal\migrate\Plugin\migrate\process\FileCopy
+ *
+ * @group migrate
+ */
+class FileCopyTest extends FileTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['migrate', 'system'];
+
+  /**
+   * The file system service.
+   *
+   * @var \Drupal\Core\File\FileSystemInterface
+   */
+  protected $fileSystem;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    $this->fileSystem = $this->container->get('file_system');
+    $this->container->get('stream_wrapper_manager')->registerWrapper('temporary', 'Drupal\Core\StreamWrapper\TemporaryStream', StreamWrapperInterface::LOCAL_NORMAL);
+  }
+
+  /**
+   * Test successful imports/copies.
+   */
+  public function testSuccessfulCopies() {
+    $file = $this->createUri(NULL, NULL, 'temporary');
+    $file_absolute = $this->fileSystem->realpath($file);
+    $data_sets = [
+      // Test a local to local copy.
+      [
+        $this->root . '/core/modules/simpletest/files/image-test.jpg',
+        'public://file1.jpg'
+      ],
+      // Test a temporary file using an absolute path.
+      [
+        $file_absolute,
+        'temporary://test.jpg'
+      ],
+      // Test a temporary file using a relative path.
+      [
+        $file_absolute,
+        'temporary://core/modules/simpletest/files/test.jpg'
+      ],
+    ];
+    foreach ($data_sets as $data) {
+      list($source_path, $destination_path) = $data;
+      $actual_destination = $this->doTransform($source_path, $destination_path);
+      $message = sprintf('File %s exists', $destination_path);
+      $this->assertFileExists($destination_path, $message);
+      // Make sure we didn't accidentally do a move.
+      $this->assertFileExists($source_path, $message);
+      $this->assertSame($actual_destination, $destination_path, 'The import returned the copied filename.');
+    }
+  }
+
+  /**
+   * Test successful moves.
+   */
+  public function testSuccessfulMoves() {
+    $file_1 = $this->createUri(NULL, NULL, 'temporary');
+    $file_1_absolute = $this->fileSystem->realpath($file_1);
+    $file_2 = $this->createUri(NULL, NULL, 'temporary');
+    $file_2_absolute = $this->fileSystem->realpath($file_2);
+    $local_file = $this->createUri(NULL, NULL, 'public');
+    $data_sets = [
+      // Test a local to local copy.
+      [
+        $local_file,
+        'public://file1.jpg'
+      ],
+      // Test a temporary file using an absolute path.
+      [
+        $file_1_absolute,
+        'temporary://test.jpg'
+      ],
+      // Test a temporary file using a relative path.
+      [
+        $file_2_absolute,
+        'temporary://core/modules/simpletest/files/test.jpg'
+      ],
+    ];
+    foreach ($data_sets as $data) {
+      list($source_path, $destination_path) = $data;
+      $actual_destination = $this->doTransform($source_path, $destination_path, ['move' => TRUE]);
+      $message = sprintf('File %s exists', $destination_path);
+      $this->assertFileExists($destination_path, $message);
+      $message = sprintf('File %s does not exist', $source_path);
+      $this->assertFileNotExists($source_path, $message);
+      $this->assertSame($actual_destination, $destination_path, 'The importer returned the moved filename.');
+    }
+  }
+
+  /**
+   * Test that non-existent files throw an exception.
+   *
+   * @expectedException \Drupal\migrate\MigrateException
+   *
+   * @expectedExceptionMessage File '/non/existent/file' does not exist
+   */
+  public function testNonExistentSourceFile() {
+    $source = '/non/existent/file';
+    $this->doTransform($source, 'public://wontmatter.jpg');
+  }
+
+  /**
+   * Tests that non-writable destination throw an exception.
+   *
+   * @covers ::transform
+   */
+  public function testNonWritableDestination() {
+    $source = $this->createUri('file.txt', NULL, 'temporary');
+
+    // Create the parent location.
+    $this->createDirectory('public://dir');
+
+    // Copy the file under public://dir/subdir1/.
+    $this->doTransform($source, 'public://dir/subdir1/file.txt');
+
+    // Check that 'subdir1' was created and the file was successfully migrated.
+    $this->assertFileExists('public://dir/subdir1/file.txt');
+
+    // Remove all permissions from public://dir to trigger a failure when
+    // trying to create a subdirectory 'subdir2' inside public://dir.
+    $this->fileSystem->chmod('public://dir', 0);
+
+    // Check that the proper exception is raised.
+    $this->setExpectedException(MigrateException::class, "Could not create or write to directory 'public://dir/subdir2'");
+    $this->doTransform($source, 'public://dir/subdir2/file.txt');
+  }
+
+  /**
+   * Test the 'rename' overwrite mode.
+   */
+  public function testRenameFile() {
+    $source = $this->createUri(NULL, NULL, 'temporary');
+    $destination = $this->createUri('foo.txt', NULL, 'public');
+    $expected_destination = 'public://foo_0.txt';
+    $actual_destination = $this->doTransform($source, $destination, ['rename' => TRUE]);
+    $this->assertFileExists($expected_destination, 'File was renamed on import');
+    $this->assertSame($actual_destination, $expected_destination, 'The importer returned the renamed filename.');
+  }
+
+  /**
+   * Tests that remote URIs are delegated to the download plugin.
+   */
+  public function testDownloadRemoteUri() {
+    $download_plugin = $this->getMock(MigrateProcessInterface::class);
+    $download_plugin->expects($this->once())->method('transform');
+
+    $plugin = new FileCopy(
+      [],
+      $this->randomMachineName(),
+      [],
+      $this->container->get('stream_wrapper_manager'),
+      $this->container->get('file_system'),
+      $download_plugin
+    );
+
+    $plugin->transform(
+      ['http://drupal.org/favicon.ico', '/destination/path'],
+      $this->getMock(MigrateExecutableInterface::class),
+      new Row([], []),
+      $this->randomMachineName()
+    );
+  }
+
+  /**
+   * Do an import using the destination.
+   *
+   * @param string $source_path
+   *   Source path to copy from.
+   * @param string $destination_path
+   *   The destination path to copy to.
+   * @param array $configuration
+   *   Process plugin configuration settings.
+   *
+   * @return string
+   *   The URI of the copied file.
+   */
+  protected function doTransform($source_path, $destination_path, $configuration = []) {
+    $plugin = FileCopy::create($this->container, $configuration, 'file_copy', []);
+    $executable = $this->prophesize(MigrateExecutableInterface::class)->reveal();
+    $row = new Row([], []);
+
+    return $plugin->transform([$source_path, $destination_path], $executable, $row, 'foobaz');
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/process/HandleMultiplesTest.php

@@ -0,0 +1,138 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel\process;
+
+use Drupal\KernelTests\KernelTestBase;
+use Drupal\migrate\MigrateExecutable;
+use Drupal\migrate\MigrateMessage;
+use Drupal\migrate\Plugin\MigrationInterface;
+
+/**
+ * Tests process pipelines with scalar and multiple values handling.
+ *
+ * @group migrate
+ */
+class HandleMultiplesTest extends KernelTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['migrate'];
+
+  /**
+   * Provides the test migration definition.
+   *
+   * @return array
+   */
+  public function getDefinition() {
+    return [
+      'source' => [
+        'plugin' => 'embedded_data',
+        'data_rows' => [],
+        'ids' => [
+          'id' => ['type' => 'string'],
+        ],
+      ],
+      'process' => [
+        // Process pipeline for testing values from string to array to string.
+        'first' => [
+          // Expects a string and returns an array.
+          [
+            'plugin' => 'explode',
+            'source' => 'scalar',
+            'delimiter' => '/',
+          ],
+          // Expects an array and returns a string.
+          [
+            'plugin' => 'extract',
+            'index' => [1],
+          ],
+          // Expects a string and returns a string.
+          [
+            'plugin' => 'callback',
+            'callable' => 'strtoupper',
+          ],
+        ],
+        // Process pipeline for testing values from array to string to array.
+        'second' => [
+          // Expects an array and returns a string.
+          [
+            'plugin' => 'extract',
+            'source' => 'multiple',
+            'index' => [1],
+          ],
+          // Expects a string and returns a string.
+          [
+            'plugin' => 'callback',
+            'callable' => 'strtoupper',
+          ],
+          // Expects a string and returns an array.
+          [
+            'plugin' => 'explode',
+            'delimiter' => '/',
+          ],
+        ],
+      ],
+      'destination' => [
+        'plugin' => 'config',
+        'config_name' => 'migrate_test.settings',
+      ],
+    ];
+  }
+
+  /**
+   * Tests process pipelines with scalar and multiple values handling.
+   *
+   * @dataProvider scalarAndMultipleValuesProviderSource
+   *
+   * @param array $source_data
+   * @param array $expected_data
+   */
+  public function testScalarAndMultipleValues(array $source_data, array $expected_data) {
+    $definition = $this->getDefinition();
+    $definition['source']['data_rows'] = [$source_data];
+
+    $migration = \Drupal::service('plugin.manager.migration')->createStubMigration($definition);
+
+    $executable = new MigrateExecutable($migration, new MigrateMessage());
+    $result = $executable->import();
+
+    // Migration needs to succeed before further assertions are made.
+    $this->assertSame(MigrationInterface::RESULT_COMPLETED, $result);
+
+    // Compare with expected data.
+    $this->assertEquals($expected_data, \Drupal::config('migrate_test.settings')->get());
+  }
+
+  /**
+   * Provides the source data with scalar and multiple values.
+   *
+   * @return array
+   */
+  public function scalarAndMultipleValuesProviderSource() {
+    return [
+      [
+        'source_data' => [
+          'id' => '1',
+          // Source value for the first pipeline.
+          'scalar' => 'foo/bar',
+          // Source value for the second pipeline.
+          'multiple' => [
+            'foo',
+            'bar/baz',
+          ],
+        ],
+        'expected_data' => [
+          // Expected value from the first pipeline.
+          'first' => 'BAR',
+          // Expected value from the second pipeline.
+          'second' => [
+            'BAR',
+            'BAZ',
+          ],
+        ],
+      ],
+    ];
+  }
+
+}

web/core/modules/migrate/tests/src/Kernel/process/RouteTest.php

@@ -0,0 +1,278 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel\process;
+
+use Drupal\KernelTests\KernelTestBase;
+use Drupal\migrate\Plugin\migrate\process\Route;
+use Drupal\migrate\MigrateExecutableInterface;
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate\Row;
+use Drupal\user\Entity\User;
+
+/**
+ * Tests the route process plugin.
+ *
+ * @coversDefaultClass \Drupal\migrate\Plugin\migrate\process\Route
+ *
+ * @group migrate
+ */
+class RouteTest extends KernelTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['user', 'system'];
+
+  /**
+   * Tests Route plugin based on providerTestRoute() values.
+   *
+   * @param mixed $value
+   *   Input value for the Route process plugin.
+   * @param array $expected
+   *   The expected results from the Route transform process.
+   *
+   * @dataProvider providerTestRoute
+   */
+  public function testRoute($value, $expected) {
+    $actual = $this->doTransform($value);
+    $this->assertSame($expected, $actual);
+  }
+
+  /**
+   * Data provider for testRoute().
+   *
+   * @return array
+   *   An array of arrays, where the first element is the input to the Route
+   *   process plugin, and the second is the expected results.
+   */
+  public function providerTestRoute() {
+    // Internal link tests.
+    // Valid link path and options.
+    $values[0] = [
+      'user/login',
+      [
+        'attributes' => [
+          'title' => 'Test menu link 1',
+        ],
+      ],
+    ];
+    $expected[0] = [
+      'route_name' => 'user.login',
+      'route_parameters' => [],
+      'options' => [
+        'query' => [],
+        'attributes' => [
+          'title' => 'Test menu link 1',
+        ],
+      ],
+      'url' => NULL,
+    ];
+
+    // Valid link path and empty options.
+    $values[1] = [
+      'user/login',
+      [],
+    ];
+    $expected[1] = [
+      'route_name' => 'user.login',
+      'route_parameters' => [],
+      'options' => [
+        'query' => [],
+      ],
+      'url' => NULL,
+    ];
+
+    // Valid link path and no options.
+    $values[2] = 'user/login';
+    $expected[2] = [
+      'route_name' => 'user.login',
+      'route_parameters' => [],
+      'options' => [
+        'query' => [],
+      ],
+      'url' => NULL,
+    ];
+
+    // Invalid link path.
+    $values[3] = 'users';
+    $expected[3] = [];
+
+    // Valid link path with parameter.
+    $values[4] = [
+      'system/timezone/nzdt',
+      [
+        'attributes' => [
+          'title' => 'Show NZDT',
+        ],
+      ],
+    ];
+    $expected[4] = [
+      'route_name' => 'system.timezone',
+      'route_parameters' => [
+        'abbreviation' => 'nzdt',
+        'offset' => -1,
+        'is_daylight_saving_time' => NULL,
+      ],
+      'options' => [
+        'query' => [],
+        'attributes' => [
+          'title' => 'Show NZDT',
+        ],
+      ],
+      'url' => NULL,
+    ];
+
+    // External link tests.
+    // Valid external link path and options.
+    $values[5] = [
+      'https://www.drupal.org',
+      [
+        'attributes' => [
+          'title' => 'Drupal',
+        ],
+      ],
+    ];
+    $expected[5] = [
+      'route_name' => NULL,
+      'route_parameters' => [],
+      'options' => [
+        'attributes' => [
+          'title' => 'Drupal',
+        ],
+      ],
+      'url' => 'https://www.drupal.org',
+    ];
+
+    // Valid external link path and options.
+    $values[6] = [
+      'https://www.drupal.org/user/1/edit?pass-reset-token=QgtDKcRV4e4fjg6v2HTa6CbWx-XzMZ5XBZTufinqsM73qIhscIuU_BjZ6J2tv4dQI6N50ZJOag',
+      [
+        'attributes' => [
+          'title' => 'Drupal password reset',
+        ],
+      ],
+    ];
+    $expected[6] = [
+      'route_name' => NULL,
+      'route_parameters' => [],
+      'options' => [
+        'attributes' => [
+          'title' => 'Drupal password reset',
+        ],
+      ],
+      'url' => 'https://www.drupal.org/user/1/edit?pass-reset-token=QgtDKcRV4e4fjg6v2HTa6CbWx-XzMZ5XBZTufinqsM73qIhscIuU_BjZ6J2tv4dQI6N50ZJOag',
+    ];
+
+    return [
+      // Test data for internal paths.
+      // Test with valid link path and options.
+      [$values[0], $expected[0]],
+      // Test with valid link path and empty options.
+      [$values[1], $expected[1]],
+      // Test with valid link path and no options.
+      [$values[2], $expected[2]],
+      // Test with Invalid link path.
+      [$values[3], $expected[3]],
+      // Test with Valid link path with query options and parameters.
+      [$values[4], $expected[4]],
+
+      // Test data for external paths.
+      // Test with external link path and options.
+      [$values[5], $expected[5]],
+      // Test with valid link path and query options.
+      [$values[6], $expected[6]],
+    ];
+  }
+
+  /**
+   * Tests Route plugin based on providerTestRoute() values.
+   *
+   * @param mixed $value
+   *   Input value for the Route process plugin.
+   * @param array $expected
+   *   The expected results from the Route transform process.
+   *
+   * @dataProvider providerTestRouteWithParamQuery
+   */
+  public function testRouteWithParamQuery($value, $expected) {
+    $this->installSchema('system', ['sequences']);
+    $this->installEntitySchema('user');
+    $this->installConfig(['user']);
+
+    // Create a user so that user/1/edit is a valid path.
+    $adminUser = User::create([
+      'name' => $this->randomMachineName(),
+    ]);
+    $adminUser->save();
+
+    $actual = $this->doTransform($value);
+    $this->assertSame($expected, $actual);
+  }
+
+  /**
+   * Data provider for testRouteWithParamQuery().
+   *
+   * @return array
+   *   An array of arrays, where the first element is the input to the Route
+   *   process plugin, and the second is the expected results.
+   */
+  public function providerTestRouteWithParamQuery() {
+    $values = [];
+    $expected = [];
+    // Valid link path with query options and parameters.
+    $values[0] = [
+      'user/1/edit',
+      [
+        'attributes' => [
+          'title' => 'Edit admin',
+        ],
+        'query' => [
+          'destination' => '/admin/people',
+        ],
+      ],
+    ];
+    $expected[0] = [
+      'route_name' => 'entity.user.edit_form',
+      'route_parameters' => [
+        'user' => '1',
+      ],
+      'options' => [
+        'attributes' => [
+          'title' => 'Edit admin',
+        ],
+        'query' => [
+          'destination' => '/admin/people',
+        ],
+      ],
+      'url' => NULL,
+    ];
+
+    return [
+      // Test with valid link path with parameters and options.
+      [$values[0], $expected[0]],
+    ];
+  }
+
+  /**
+   * Transforms link path data to a route.
+   *
+   * @param array|string $value
+   *   Source link path information.
+   *
+   * @return array $actual
+   *   The route information based on the source link_path.
+   */
+  protected function doTransform($value) {
+    // Rebuild the routes.
+    $this->container->get('router.builder')->rebuild();
+    $pathValidator = $this->container->get('path.validator');
+    $row = new Row();
+    $migration = $this->prophesize(MigrationInterface::class)->reveal();
+    $executable = $this->prophesize(MigrateExecutableInterface::class)->reveal();
+
+    $plugin = new Route([], 'route', [], $migration, $pathValidator);
+    $actual = $plugin->transform($value, $executable, $row, 'destinationproperty');
+    return $actual;
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/Event/EventBaseTest.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit\Event;
+
+use Drupal\migrate\Event\EventBase;
+
+/**
+ * @coversDefaultClass \Drupal\migrate\Event\EventBase
+ * @group migrate
+ */
+class EventBaseTest extends \PHPUnit_Framework_TestCase {
+
+  /**
+   * Test getMigration method.
+   *
+   * @covers ::__construct
+   * @covers ::getMigration
+   */
+  public function testGetMigration() {
+    $migration = $this->prophesize('\Drupal\migrate\Plugin\MigrationInterface')->reveal();
+    $message_service = $this->prophesize('\Drupal\migrate\MigrateMessageInterface')->reveal();
+    $row = $this->prophesize('\Drupal\migrate\Row')->reveal();
+    $event = new EventBase($migration, $message_service, $row, [1, 2, 3]);
+    $this->assertSame($migration, $event->getMigration());
+  }
+
+  /**
+   * Test logging a message.
+   *
+   * @covers ::__construct
+   * @covers ::logMessage
+   */
+  public function testLogMessage() {
+    $migration = $this->prophesize('\Drupal\migrate\Plugin\MigrationInterface')->reveal();
+    $message_service = $this->prophesize('\Drupal\migrate\MigrateMessageInterface');
+    $event = new EventBase($migration, $message_service->reveal());
+    // Assert that the intended calls to the services happen.
+    $message_service->display('status message', 'status')->shouldBeCalledTimes(1);
+    $event->logMessage('status message');
+    $message_service->display('warning message', 'warning')->shouldBeCalledTimes(1);
+    $event->logMessage('warning message', 'warning');
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/Event/MigrateImportEventTest.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit\Event;
+
+use Drupal\migrate\Event\MigrateImportEvent;
+
+/**
+ * @coversDefaultClass \Drupal\migrate\Event\MigrateImportEvent
+ * @group migrate
+ */
+class MigrateImportEventTest extends \PHPUnit_Framework_TestCase {
+
+  /**
+   * Test getMigration method.
+   *
+   * @covers ::__construct
+   * @covers ::getMigration
+   */
+  public function testGetMigration() {
+    $migration = $this->prophesize('\Drupal\migrate\Plugin\MigrationInterface')->reveal();
+    $message_service = $this->prophesize('\Drupal\migrate\MigrateMessageInterface')->reveal();
+    $event = new MigrateImportEvent($migration, $message_service);
+    $this->assertSame($migration, $event->getMigration());
+  }
+
+  /**
+   * Test logging a message.
+   *
+   * @covers ::__construct
+   * @covers ::logMessage
+   */
+  public function testLogMessage() {
+    $migration = $this->prophesize('\Drupal\migrate\Plugin\MigrationInterface');
+    $message_service = $this->prophesize('\Drupal\migrate\MigrateMessageInterface');
+    $event = new MigrateImportEvent($migration->reveal(), $message_service->reveal());
+    // Assert that the intended calls to the services happen.
+    $message_service->display('status message', 'status')->shouldBeCalledTimes(1);
+    $event->logMessage('status message');
+    $message_service->display('warning message', 'warning')->shouldBeCalledTimes(1);
+    $event->logMessage('warning message', 'warning');
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/Event/MigratePostRowSaveEventTest.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit\Event;
+
+use Drupal\migrate\Event\MigratePostRowSaveEvent;
+
+/**
+ * @coversDefaultClass \Drupal\migrate\Event\MigratePostRowSaveEvent
+ * @group migrate
+ */
+class MigratePostRowSaveEventTest extends EventBaseTest {
+
+  /**
+   * Test getDestinationIdValues method.
+   *
+   * @covers ::__construct
+   * @covers ::getDestinationIdValues
+   */
+  public function testGetDestinationIdValues() {
+    $migration = $this->prophesize('\Drupal\migrate\Plugin\MigrationInterface')->reveal();
+    $message_service = $this->prophesize('\Drupal\migrate\MigrateMessageInterface')->reveal();
+    $row = $this->prophesize('\Drupal\migrate\Row')->reveal();
+    $event = new MigratePostRowSaveEvent($migration, $message_service, $row, [1, 2, 3]);
+    $this->assertSame([1, 2, 3], $event->getDestinationIdValues());
+  }
+
+  /**
+   * Test getRow method.
+   *
+   * @covers ::__construct
+   * @covers ::getRow
+   */
+  public function testGetRow() {
+    $migration = $this->prophesize('\Drupal\migrate\Plugin\MigrationInterface')->reveal();
+    $message_service = $this->prophesize('\Drupal\migrate\MigrateMessageInterface');
+    $row = $this->prophesize('\Drupal\migrate\Row')->reveal();
+    $event = new MigratePostRowSaveEvent($migration, $message_service->reveal(), $row, [1, 2, 3]);
+    $this->assertSame($row, $event->getRow());
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/Event/MigratePreRowSaveEventTest.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit\Event;
+
+use Drupal\migrate\Event\MigratePreRowSaveEvent;
+
+/**
+ * @coversDefaultClass \Drupal\migrate\Event\MigratePreRowSaveEvent
+ * @group migrate
+ */
+class MigratePreRowSaveEventTest extends EventBaseTest {
+
+  /**
+   * Test getRow method.
+   *
+   * @covers ::__construct
+   * @covers ::getRow
+   */
+  public function testGetRow() {
+    $migration = $this->prophesize('\Drupal\migrate\Plugin\MigrationInterface')->reveal();
+    $message_service = $this->prophesize('\Drupal\migrate\MigrateMessageInterface')->reveal();
+    $row = $this->prophesize('\Drupal\migrate\Row')->reveal();
+    $event = new MigratePreRowSaveEvent($migration, $message_service, $row);
+    $this->assertSame($row, $event->getRow());
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/Exception/RequirementsExceptionTest.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit\Exception;
+
+use Drupal\migrate\Exception\RequirementsException;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * @coversDefaultClass \Drupal\migrate\Exception\RequirementsException
+ * @group migration
+ */
+class RequirementsExceptionTest extends UnitTestCase {
+
+  protected $missingRequirements = ['random_jackson_pivot', '51_Eridani_b'];
+
+  /**
+   * @covers ::getRequirements
+   */
+  public function testGetRequirements() {
+    $exception = new RequirementsException('Missing requirements ', ['requirements' => $this->missingRequirements]);
+    $this->assertArrayEquals(['requirements' => $this->missingRequirements], $exception->getRequirements());
+  }
+
+  /**
+   * @covers ::getRequirementsString
+   * @dataProvider getRequirementsProvider
+   */
+  public function testGetExceptionString($expected, $message, $requirements) {
+    $exception = new RequirementsException($message, $requirements);
+    $this->assertEquals($expected, $exception->getRequirementsString());
+  }
+
+  /**
+   * Provides a list of requirements to test.
+   */
+  public function getRequirementsProvider() {
+    return array(
+      array(
+        'requirements: random_jackson_pivot.',
+        'Single Requirement',
+        array('requirements' => $this->missingRequirements[0]),
+      ),
+      array(
+        'requirements: random_jackson_pivot. requirements: 51_Eridani_b.',
+        'Multiple Requirements',
+        array('requirements' => $this->missingRequirements),
+      ),
+    );
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/MigrateExecutableMemoryExceededTest.php

@@ -0,0 +1,118 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit;
+
+/**
+ * Tests the \Drupal\migrate\MigrateExecutable::memoryExceeded() method.
+ *
+ * @group migrate
+ */
+class MigrateExecutableMemoryExceededTest extends MigrateTestCase {
+
+  /**
+   * The mocked migration entity.
+   *
+   * @var \Drupal\migrate\Plugin\MigrationInterface|\PHPUnit_Framework_MockObject_MockObject
+   */
+  protected $migration;
+
+  /**
+   * The mocked migrate message.
+   *
+   * @var \Drupal\migrate\MigrateMessageInterface|\PHPUnit_Framework_MockObject_MockObject
+   */
+  protected $message;
+
+  /**
+   * The tested migrate executable.
+   *
+   * @var \Drupal\Tests\migrate\Unit\TestMigrateExecutable
+   */
+  protected $executable;
+
+  /**
+   * The migration configuration, initialized to set the ID to test.
+   *
+   * @var array
+   */
+  protected $migrationConfiguration = array(
+    'id' => 'test',
+  );
+
+  /**
+   * The php.ini memory_limit value.
+   *
+   * @var int
+   */
+  protected $memoryLimit = 10000000;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    $this->migration = $this->getMigration();
+    $this->message = $this->getMock('Drupal\migrate\MigrateMessageInterface');
+
+    $this->executable = new TestMigrateExecutable($this->migration, $this->message);
+    $this->executable->setStringTranslation($this->getStringTranslationStub());
+  }
+
+  /**
+   * Runs the actual test.
+   *
+   * @param string $message
+   *   The second message to assert.
+   * @param bool $memory_exceeded
+   *   Whether to test the memory exceeded case.
+   * @param int|null $memory_usage_first
+   *   (optional) The first memory usage value. Defaults to NULL.
+   * @param int|null $memory_usage_second
+   *   (optional) The fake amount of memory usage reported after memory reclaim.
+   *   Defaults to NULL.
+   * @param int|null $memory_limit
+   *   (optional) The memory limit. Defaults to NULL.
+   */
+  protected function runMemoryExceededTest($message, $memory_exceeded, $memory_usage_first = NULL, $memory_usage_second = NULL, $memory_limit = NULL) {
+    $this->executable->setMemoryLimit($memory_limit ?: $this->memoryLimit);
+    $this->executable->setMemoryUsage($memory_usage_first ?: $this->memoryLimit, $memory_usage_second ?: $this->memoryLimit);
+    $this->executable->setMemoryThreshold(0.85);
+    if ($message) {
+      $this->executable->message->expects($this->at(0))
+        ->method('display')
+        ->with($this->stringContains('reclaiming memory'));
+      $this->executable->message->expects($this->at(1))
+        ->method('display')
+        ->with($this->stringContains($message));
+    }
+    else {
+      $this->executable->message->expects($this->never())
+        ->method($this->anything());
+    }
+    $result = $this->executable->memoryExceeded();
+    $this->assertEquals($memory_exceeded, $result);
+  }
+
+  /**
+   * Tests memoryExceeded method when a new batch is needed.
+   */
+  public function testMemoryExceededNewBatch() {
+    // First case try reset and then start new batch.
+    $this->runMemoryExceededTest('starting new batch', TRUE);
+  }
+
+  /**
+   * Tests memoryExceeded method when enough is cleared.
+   */
+  public function testMemoryExceededClearedEnough() {
+    $this->runMemoryExceededTest('reclaimed enough', FALSE, $this->memoryLimit, $this->memoryLimit * 0.75);
+  }
+
+  /**
+   * Tests memoryExceeded when memory usage is not exceeded.
+   */
+  public function testMemoryNotExceeded() {
+    $this->runMemoryExceededTest('', FALSE, floor($this->memoryLimit * 0.85) - 1);
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/MigrateExecutableTest.php

@@ -0,0 +1,449 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit;
+
+use Drupal\Component\Utility\Html;
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate\Plugin\MigrateIdMapInterface;
+use Drupal\migrate\MigrateException;
+use Drupal\migrate\Row;
+
+/**
+ * @coversDefaultClass \Drupal\migrate\MigrateExecutable
+ * @group migrate
+ */
+class MigrateExecutableTest extends MigrateTestCase {
+
+  /**
+   * The mocked migration entity.
+   *
+   * @var \Drupal\migrate\Plugin\MigrationInterface|\PHPUnit_Framework_MockObject_MockObject
+   */
+  protected $migration;
+
+  /**
+   * The mocked migrate message.
+   *
+   * @var \Drupal\migrate\MigrateMessageInterface|\PHPUnit_Framework_MockObject_MockObject
+   */
+  protected $message;
+
+  /**
+   * The tested migrate executable.
+   *
+   * @var \Drupal\Tests\migrate\Unit\TestMigrateExecutable
+   */
+  protected $executable;
+
+  /**
+   * The migration's configuration values.
+   *
+   * @var array
+   */
+  protected $migrationConfiguration = array(
+    'id' => 'test',
+  );
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    $this->migration = $this->getMigration();
+    $this->message = $this->getMock('Drupal\migrate\MigrateMessageInterface');
+    $event_dispatcher = $this->getMock('Symfony\Component\EventDispatcher\EventDispatcherInterface');
+    $this->executable = new TestMigrateExecutable($this->migration, $this->message, $event_dispatcher);
+    $this->executable->setStringTranslation($this->getStringTranslationStub());
+  }
+
+  /**
+   * Tests an import with an incomplete rewinding.
+   */
+  public function testImportWithFailingRewind() {
+    $exception_message = $this->getRandomGenerator()->string();
+    $source = $this->getMock('Drupal\migrate\Plugin\MigrateSourceInterface');
+    $source->expects($this->once())
+      ->method('rewind')
+      ->will($this->throwException(new \Exception($exception_message)));
+
+    $this->migration->expects($this->any())
+      ->method('getSourcePlugin')
+      ->will($this->returnValue($source));
+
+    // Ensure that a message with the proper message was added.
+    $this->message->expects($this->once())
+      ->method('display')
+      ->with("Migration failed with source plugin exception: " . Html::escape($exception_message));
+
+    $result = $this->executable->import();
+    $this->assertEquals(MigrationInterface::RESULT_FAILED, $result);
+  }
+
+  /**
+   * Tests the import method with a valid row.
+   */
+  public function testImportWithValidRow() {
+    $source = $this->getMockSource();
+
+    $row = $this->getMockBuilder('Drupal\migrate\Row')
+      ->disableOriginalConstructor()
+      ->getMock();
+
+    $row->expects($this->once())
+      ->method('getSourceIdValues')
+      ->will($this->returnValue(array('id' => 'test')));
+
+    $this->idMap->expects($this->once())
+      ->method('lookupDestinationId')
+      ->with(array('id' => 'test'))
+      ->will($this->returnValue(array('test')));
+
+    $source->expects($this->once())
+      ->method('current')
+      ->will($this->returnValue($row));
+
+    $this->executable->setSource($source);
+
+    $this->migration->expects($this->once())
+      ->method('getProcessPlugins')
+      ->will($this->returnValue(array()));
+
+    $destination = $this->getMock('Drupal\migrate\Plugin\MigrateDestinationInterface');
+    $destination->expects($this->once())
+      ->method('import')
+      ->with($row, array('test'))
+      ->will($this->returnValue(array('id' => 'test')));
+
+    $this->migration
+      ->method('getDestinationPlugin')
+      ->willReturn($destination);
+
+    $this->assertSame(MigrationInterface::RESULT_COMPLETED, $this->executable->import());
+  }
+
+  /**
+   * Tests the import method with a valid row.
+   */
+  public function testImportWithValidRowWithoutDestinationId() {
+    $source = $this->getMockSource();
+
+    $row = $this->getMockBuilder('Drupal\migrate\Row')
+      ->disableOriginalConstructor()
+      ->getMock();
+
+    $row->expects($this->once())
+      ->method('getSourceIdValues')
+      ->will($this->returnValue(array('id' => 'test')));
+
+    $this->idMap->expects($this->once())
+      ->method('lookupDestinationId')
+      ->with(array('id' => 'test'))
+      ->will($this->returnValue(array('test')));
+
+    $source->expects($this->once())
+      ->method('current')
+      ->will($this->returnValue($row));
+
+    $this->executable->setSource($source);
+
+    $this->migration->expects($this->once())
+      ->method('getProcessPlugins')
+      ->will($this->returnValue(array()));
+
+    $destination = $this->getMock('Drupal\migrate\Plugin\MigrateDestinationInterface');
+    $destination->expects($this->once())
+      ->method('import')
+      ->with($row, array('test'))
+      ->will($this->returnValue(TRUE));
+
+    $this->migration
+      ->method('getDestinationPlugin')
+      ->willReturn($destination);
+
+    $this->idMap->expects($this->never())
+      ->method('saveIdMapping');
+
+    $this->assertSame(MigrationInterface::RESULT_COMPLETED, $this->executable->import());
+  }
+
+  /**
+   * Tests the import method with a valid row.
+   */
+  public function testImportWithValidRowNoDestinationValues() {
+    $source = $this->getMockSource();
+
+    $row = $this->getMockBuilder('Drupal\migrate\Row')
+      ->disableOriginalConstructor()
+      ->getMock();
+
+    $row->expects($this->once())
+      ->method('getSourceIdValues')
+      ->will($this->returnValue(array('id' => 'test')));
+
+    $source->expects($this->once())
+      ->method('current')
+      ->will($this->returnValue($row));
+
+    $this->executable->setSource($source);
+
+    $this->migration->expects($this->once())
+      ->method('getProcessPlugins')
+      ->will($this->returnValue(array()));
+
+    $destination = $this->getMock('Drupal\migrate\Plugin\MigrateDestinationInterface');
+    $destination->expects($this->once())
+      ->method('import')
+      ->with($row, array('test'))
+      ->will($this->returnValue(array()));
+
+    $this->migration
+      ->method('getDestinationPlugin')
+      ->willReturn($destination);
+
+    $this->idMap->expects($this->once())
+      ->method('saveIdMapping')
+      ->with($row, array(), MigrateIdMapInterface::STATUS_FAILED, NULL);
+
+    $this->idMap->expects($this->once())
+      ->method('messageCount')
+      ->will($this->returnValue(0));
+
+    $this->idMap->expects($this->once())
+      ->method('saveMessage');
+
+    $this->idMap->expects($this->once())
+      ->method('lookupDestinationId')
+      ->with(array('id' => 'test'))
+      ->will($this->returnValue(array('test')));
+
+    $this->message->expects($this->once())
+      ->method('display')
+      ->with('New object was not saved, no error provided');
+
+    $this->assertSame(MigrationInterface::RESULT_COMPLETED, $this->executable->import());
+  }
+
+  /**
+   * Tests the import method with a thrown MigrateException.
+   *
+   * The MigrationException in this case is being thrown from the destination.
+   */
+  public function testImportWithValidRowWithDestinationMigrateException() {
+    $exception_message = $this->getRandomGenerator()->string();
+    $source = $this->getMockSource();
+
+    $row = $this->getMockBuilder('Drupal\migrate\Row')
+      ->disableOriginalConstructor()
+      ->getMock();
+
+    $row->expects($this->once())
+      ->method('getSourceIdValues')
+      ->will($this->returnValue(array('id' => 'test')));
+
+    $source->expects($this->once())
+      ->method('current')
+      ->will($this->returnValue($row));
+
+    $this->executable->setSource($source);
+
+    $this->migration->expects($this->once())
+      ->method('getProcessPlugins')
+      ->will($this->returnValue(array()));
+
+    $destination = $this->getMock('Drupal\migrate\Plugin\MigrateDestinationInterface');
+    $destination->expects($this->once())
+      ->method('import')
+      ->with($row, array('test'))
+      ->will($this->throwException(new MigrateException($exception_message)));
+
+    $this->migration
+      ->method('getDestinationPlugin')
+      ->willReturn($destination);
+
+    $this->idMap->expects($this->once())
+      ->method('saveIdMapping')
+      ->with($row, array(), MigrateIdMapInterface::STATUS_FAILED, NULL);
+
+    $this->idMap->expects($this->once())
+      ->method('saveMessage');
+
+    $this->idMap->expects($this->once())
+      ->method('lookupDestinationId')
+      ->with(array('id' => 'test'))
+      ->will($this->returnValue(array('test')));
+
+    $this->assertSame(MigrationInterface::RESULT_COMPLETED, $this->executable->import());
+  }
+
+  /**
+   * Tests the import method with a thrown MigrateException.
+   *
+   * The MigrationException in this case is being thrown from a process plugin.
+   */
+  public function testImportWithValidRowWithProcesMigrateException() {
+    $exception_message = $this->getRandomGenerator()->string();
+    $source = $this->getMockSource();
+
+    $row = $this->getMockBuilder('Drupal\migrate\Row')
+      ->disableOriginalConstructor()
+      ->getMock();
+
+    $row->expects($this->once())
+      ->method('getSourceIdValues')
+      ->willReturn(array('id' => 'test'));
+
+    $source->expects($this->once())
+      ->method('current')
+      ->willReturn($row);
+
+    $this->executable->setSource($source);
+
+    $this->migration->expects($this->once())
+      ->method('getProcessPlugins')
+      ->willThrowException(new MigrateException($exception_message));
+
+    $destination = $this->getMock('Drupal\migrate\Plugin\MigrateDestinationInterface');
+    $destination->expects($this->never())
+      ->method('import');
+
+    $this->migration
+      ->method('getDestinationPlugin')
+      ->willReturn($destination);
+
+    $this->idMap->expects($this->once())
+      ->method('saveIdMapping')
+      ->with($row, array(), MigrateIdMapInterface::STATUS_FAILED, NULL);
+
+    $this->idMap->expects($this->once())
+      ->method('saveMessage');
+
+    $this->idMap->expects($this->never())
+      ->method('lookupDestinationId');
+
+    $this->assertSame(MigrationInterface::RESULT_COMPLETED, $this->executable->import());
+  }
+
+  /**
+   * Tests the import method with a regular Exception being thrown.
+   */
+  public function testImportWithValidRowWithException() {
+    $exception_message = $this->getRandomGenerator()->string();
+    $source = $this->getMockSource();
+
+    $row = $this->getMockBuilder('Drupal\migrate\Row')
+      ->disableOriginalConstructor()
+      ->getMock();
+
+    $row->expects($this->once())
+      ->method('getSourceIdValues')
+      ->will($this->returnValue(array('id' => 'test')));
+
+    $source->expects($this->once())
+      ->method('current')
+      ->will($this->returnValue($row));
+
+    $this->executable->setSource($source);
+
+    $this->migration->expects($this->once())
+      ->method('getProcessPlugins')
+      ->will($this->returnValue(array()));
+
+    $destination = $this->getMock('Drupal\migrate\Plugin\MigrateDestinationInterface');
+    $destination->expects($this->once())
+      ->method('import')
+      ->with($row, array('test'))
+      ->will($this->throwException(new \Exception($exception_message)));
+
+    $this->migration
+      ->method('getDestinationPlugin')
+      ->willReturn($destination);
+
+    $this->idMap->expects($this->once())
+      ->method('saveIdMapping')
+      ->with($row, array(), MigrateIdMapInterface::STATUS_FAILED, NULL);
+
+    $this->idMap->expects($this->once())
+      ->method('saveMessage');
+
+    $this->idMap->expects($this->once())
+      ->method('lookupDestinationId')
+      ->with(array('id' => 'test'))
+      ->will($this->returnValue(array('test')));
+
+    $this->message->expects($this->once())
+      ->method('display')
+      ->with($exception_message);
+
+    $this->assertSame(MigrationInterface::RESULT_COMPLETED, $this->executable->import());
+  }
+
+  /**
+   * Tests the processRow method.
+   */
+  public function testProcessRow() {
+    $expected = array(
+      'test' => 'test destination',
+      'test1' => 'test1 destination'
+    );
+    foreach ($expected as $key => $value) {
+      $plugins[$key][0] = $this->getMock('Drupal\migrate\Plugin\MigrateProcessInterface');
+      $plugins[$key][0]->expects($this->once())
+        ->method('getPluginDefinition')
+        ->will($this->returnValue(array()));
+      $plugins[$key][0]->expects($this->once())
+        ->method('transform')
+        ->will($this->returnValue($value));
+    }
+    $this->migration->expects($this->once())
+      ->method('getProcessPlugins')
+      ->with(NULL)
+      ->will($this->returnValue($plugins));
+    $row = new Row();
+    $this->executable->processRow($row);
+    foreach ($expected as $key => $value) {
+      $this->assertSame($row->getDestinationProperty($key), $value);
+    }
+    $this->assertSame(count($row->getDestination()), count($expected));
+  }
+
+  /**
+   * Tests the processRow method with an empty pipeline.
+   */
+  public function testProcessRowEmptyPipeline() {
+    $this->migration->expects($this->once())
+      ->method('getProcessPlugins')
+      ->with(NULL)
+      ->will($this->returnValue(array('test' => array())));
+    $row = new Row();
+    $this->executable->processRow($row);
+    $this->assertSame($row->getDestination(), array());
+  }
+
+  /**
+   * Returns a mock migration source instance.
+   *
+   * @return \Drupal\migrate\Plugin\MigrateSourceInterface|\PHPUnit_Framework_MockObject_MockObject
+   *   The mocked migration source.
+   */
+  protected function getMockSource() {
+    $iterator = $this->getMock('\Iterator');
+
+    $class = 'Drupal\migrate\Plugin\migrate\source\SourcePluginBase';
+    $source = $this->getMockBuilder($class)
+      ->disableOriginalConstructor()
+      ->setMethods(get_class_methods($class))
+      ->getMockForAbstractClass();
+    $source->expects($this->once())
+      ->method('rewind')
+      ->will($this->returnValue(TRUE));
+    $source->expects($this->any())
+      ->method('initializeIterator')
+      ->will($this->returnValue([]));
+    $source->expects($this->any())
+      ->method('valid')
+      ->will($this->onConsecutiveCalls(TRUE, FALSE));
+
+    return $source;
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/MigrateSourceTest.php

@@ -0,0 +1,551 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\migrate\Unit\MigrateSourceTest.
+ */
+
+namespace Drupal\Tests\migrate\Unit;
+
+use Drupal\Core\Cache\CacheBackendInterface;
+use Drupal\Core\DependencyInjection\ContainerBuilder;
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\Core\KeyValueStore\KeyValueFactoryInterface;
+use Drupal\Core\KeyValueStore\KeyValueStoreInterface;
+use Drupal\migrate\MigrateExecutable;
+use Drupal\migrate\MigrateSkipRowException;
+use Drupal\migrate\Plugin\migrate\source\SourcePluginBase;
+use Drupal\migrate\Plugin\MigrateIdMapInterface;
+use Drupal\migrate\Row;
+
+/**
+ * @coversDefaultClass \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
+ * @group migrate
+ */
+class MigrateSourceTest extends MigrateTestCase {
+
+  /**
+   * Override the migration config.
+   *
+   * @var array
+   */
+  protected $defaultMigrationConfiguration = [
+    'id' => 'test_migration',
+    'source' => [],
+  ];
+
+  /**
+   * Test row data.
+   *
+   * @var array
+   */
+  protected $row = ['test_sourceid1' => '1', 'timestamp' => 500];
+
+  /**
+   * Test source ids.
+   *
+   * @var array
+   */
+  protected $sourceIds = ['test_sourceid1' => 'test_sourceid1'];
+
+  /**
+   * The migration entity.
+   *
+   * @var \Drupal\migrate\Plugin\MigrationInterface
+   */
+  protected $migration;
+
+  /**
+   * The migrate executable.
+   *
+   * @var \Drupal\migrate\MigrateExecutable
+   */
+  protected $executable;
+
+  /**
+   * Gets the source plugin to test.
+   *
+   * @param array $configuration
+   *   (optional) The source configuration. Defaults to an empty array.
+   * @param array $migrate_config
+   *   (optional) The migration configuration to be used in
+   *   parent::getMigration(). Defaults to an empty array.
+   * @param int $status
+   *   (optional) The default status for the new rows to be imported. Defaults
+   *   to MigrateIdMapInterface::STATUS_NEEDS_UPDATE.
+   *
+   * @return \Drupal\migrate\Plugin\MigrateSourceInterface
+   *   A mocked source plugin.
+   */
+  protected function getSource($configuration = [], $migrate_config = [], $status = MigrateIdMapInterface::STATUS_NEEDS_UPDATE, $high_water_value = NULL) {
+    $container = new ContainerBuilder();
+    \Drupal::setContainer($container);
+
+    $key_value = $this->getMock(KeyValueStoreInterface::class);
+
+    $key_value_factory = $this->getMock(KeyValueFactoryInterface::class);
+    $key_value_factory
+      ->method('get')
+      ->with('migrate:high_water')
+      ->willReturn($key_value);
+    $container->set('keyvalue', $key_value_factory);
+
+    $container->set('cache.migrate', $this->getMock(CacheBackendInterface::class));
+
+    $this->migrationConfiguration = $this->defaultMigrationConfiguration + $migrate_config;
+    $this->migration = parent::getMigration();
+    $this->executable = $this->getMigrateExecutable($this->migration);
+
+    // Update the idMap for Source so the default is that the row has already
+    // been imported. This allows us to use the highwater mark to decide on the
+    // outcome of whether we choose to import the row.
+    $id_map_array = ['original_hash' => '', 'hash' => '', 'source_row_status' => $status];
+    $this->idMap
+      ->expects($this->any())
+      ->method('getRowBySource')
+      ->willReturn($id_map_array);
+
+    $constructor_args = [$configuration, 'd6_action', [], $this->migration];
+    $methods = ['getModuleHandler', 'fields', 'getIds', '__toString', 'prepareRow', 'initializeIterator'];
+    $source_plugin = $this->getMock(SourcePluginBase::class, $methods, $constructor_args);
+
+    $source_plugin
+      ->method('fields')
+      ->willReturn([]);
+    $source_plugin
+      ->method('getIds')
+      ->willReturn([]);
+    $source_plugin
+      ->method('__toString')
+      ->willReturn('');
+    $source_plugin
+      ->method('prepareRow')
+      ->willReturn(empty($migrate_config['prepare_row_false']));
+
+    $rows = [$this->row];
+    if (isset($configuration['high_water_property']) && isset($high_water_value)) {
+      $property = $configuration['high_water_property']['name'];
+      $rows = array_filter($rows, function (array $row) use ($property, $high_water_value) {
+        return $row[$property] >= $high_water_value;
+      });
+    }
+    $iterator = new \ArrayIterator($rows);
+
+    $source_plugin
+      ->method('initializeIterator')
+      ->willReturn($iterator);
+
+    $module_handler = $this->getMock(ModuleHandlerInterface::class);
+    $source_plugin
+      ->method('getModuleHandler')
+      ->willReturn($module_handler);
+
+    $this->migration
+      ->method('getSourcePlugin')
+      ->willReturn($source_plugin);
+
+    return $source_plugin;
+  }
+
+  /**
+   * @covers ::__construct
+   * @expectedException \Drupal\migrate\MigrateException
+   */
+  public function testHighwaterTrackChangesIncompatible() {
+    $source_config = ['track_changes' => TRUE, 'high_water_property' => ['name' => 'something']];
+    $this->getSource($source_config);
+  }
+
+  /**
+   * Test that the source count is correct.
+   *
+   * @covers ::count
+   */
+  public function testCount() {
+    // Mock the cache to validate set() receives appropriate arguments.
+    $container = new ContainerBuilder();
+    $cache = $this->getMock(CacheBackendInterface::class);
+    $cache->expects($this->any())->method('set')
+        ->with($this->isType('string'), $this->isType('int'), $this->isType('int'));
+    $container->set('cache.migrate', $cache);
+    \Drupal::setContainer($container);
+
+    // Test that the basic count works.
+    $source = $this->getSource();
+    $this->assertEquals(1, $source->count());
+
+    // Test caching the count works.
+    $source = $this->getSource(['cache_counts' => TRUE]);
+    $this->assertEquals(1, $source->count());
+
+    // Test the skip argument.
+    $source = $this->getSource(['skip_count' => TRUE]);
+    $this->assertEquals(-1, $source->count());
+
+    $this->migrationConfiguration['id'] = 'test_migration';
+    $migration = $this->getMigration();
+    $source = new StubSourceGeneratorPlugin([], '', [], $migration);
+
+    // Test the skipCount property's default value.
+    $this->assertEquals(-1, $source->count());
+
+    // Test the count value using a generator.
+    $source = new StubSourceGeneratorPlugin(['skip_count' => FALSE], '', [], $migration);
+    $this->assertEquals(3, $source->count());
+  }
+
+  /**
+   * Test that the key can be set for the count cache.
+   *
+   * @covers ::count
+   */
+  public function testCountCacheKey() {
+    // Mock the cache to validate set() receives appropriate arguments.
+    $container = new ContainerBuilder();
+    $cache = $this->getMock(CacheBackendInterface::class);
+    $cache->expects($this->any())->method('set')
+        ->with('test_key', $this->isType('int'), $this->isType('int'));
+    $container->set('cache.migrate', $cache);
+    \Drupal::setContainer($container);
+
+    // Test caching the count with a configured key works.
+    $source = $this->getSource(['cache_counts' => TRUE, 'cache_key' => 'test_key']);
+    $this->assertEquals(1, $source->count());
+  }
+
+  /**
+   * Test that we don't get a row if prepareRow() is false.
+   */
+  public function testPrepareRowFalse() {
+    $source = $this->getSource([], ['prepare_row_false' => TRUE]);
+
+    $source->rewind();
+    $this->assertNull($source->current(), 'No row is available when prepareRow() is false.');
+  }
+
+  /**
+   * Test that $row->needsUpdate() works as expected.
+   */
+  public function testNextNeedsUpdate() {
+    $source = $this->getSource();
+
+    // $row->needsUpdate() === TRUE so we get a row.
+    $source->rewind();
+    $this->assertTrue(is_a($source->current(), 'Drupal\migrate\Row'), '$row->needsUpdate() is TRUE so we got a row.');
+
+    // Test that we don't get a row when the incoming row is marked as imported.
+    $source = $this->getSource([], [], MigrateIdMapInterface::STATUS_IMPORTED);
+    $source->rewind();
+    $this->assertNull($source->current(), 'Row was already imported, should be NULL');
+  }
+
+  /**
+   * Test that an outdated highwater mark does not cause a row to be imported.
+   */
+  public function testOutdatedHighwater() {
+    $configuration = [
+      'high_water_property' => [
+        'name' => 'timestamp',
+      ],
+    ];
+    $source = $this->getSource($configuration, [], MigrateIdMapInterface::STATUS_IMPORTED, $this->row['timestamp'] + 1);
+
+    // The current highwater mark is now higher than the row timestamp so no row
+    // is expected.
+    $source->rewind();
+    $this->assertNull($source->current(), 'Original highwater mark is higher than incoming row timestamp.');
+  }
+
+  /**
+   * Test that a highwater mark newer than our saved one imports a row.
+   *
+   * @throws \Exception
+   */
+  public function testNewHighwater() {
+    $configuration = [
+      'high_water_property' => [
+        'name' => 'timestamp',
+      ],
+    ];
+    // Set a highwater property field for source. Now we should have a row
+    // because the row timestamp is greater than the current highwater mark.
+    $source = $this->getSource($configuration, [], MigrateIdMapInterface::STATUS_IMPORTED, $this->row['timestamp'] - 1);
+
+    $source->rewind();
+    $this->assertInstanceOf(Row::class, $source->current(), 'Incoming row timestamp is greater than current highwater mark so we have a row.');
+  }
+
+  /**
+   * Test basic row preparation.
+   *
+   * @covers ::prepareRow
+   */
+  public function testPrepareRow() {
+    $this->migrationConfiguration['id'] = 'test_migration';
+
+    // Get a new migration with an id.
+    $migration = $this->getMigration();
+    $source = new StubSourcePlugin([], '', [], $migration);
+    $row = new Row();
+
+    $module_handler = $this->prophesize(ModuleHandlerInterface::class);
+    $module_handler->invokeAll('migrate_prepare_row', [$row, $source, $migration])
+      ->willReturn([TRUE, TRUE])
+      ->shouldBeCalled();
+    $module_handler->invokeAll('migrate_' . $migration->id() . '_prepare_row', [$row, $source, $migration])
+      ->willReturn([TRUE, TRUE])
+      ->shouldBeCalled();
+    $source->setModuleHandler($module_handler->reveal());
+
+    // Ensure we don't log this to the mapping table.
+    $this->idMap->expects($this->never())
+      ->method('saveIdMapping');
+
+    $this->assertTrue($source->prepareRow($row));
+
+    // Track_changes...
+    $source = new StubSourcePlugin(['track_changes' => TRUE], '', [], $migration);
+    $row2 = $this->prophesize(Row::class);
+    $row2->rehash()
+      ->shouldBeCalled();
+    $module_handler->invokeAll('migrate_prepare_row', [$row2, $source, $migration])
+      ->willReturn([TRUE, TRUE])
+      ->shouldBeCalled();
+    $module_handler->invokeAll('migrate_' . $migration->id() . '_prepare_row', [$row2, $source, $migration])
+      ->willReturn([TRUE, TRUE])
+      ->shouldBeCalled();
+    $source->setModuleHandler($module_handler->reveal());
+    $this->assertTrue($source->prepareRow($row2->reveal()));
+  }
+
+  /**
+   * Test that global prepare hooks can skip rows.
+   *
+   * @covers ::prepareRow
+   */
+  public function testPrepareRowGlobalPrepareSkip() {
+    $this->migrationConfiguration['id'] = 'test_migration';
+
+    $migration = $this->getMigration();
+    $source = new StubSourcePlugin([], '', [], $migration);
+    $row = new Row();
+
+    $module_handler = $this->prophesize(ModuleHandlerInterface::class);
+    // Return a failure from a prepare row hook.
+    $module_handler->invokeAll('migrate_prepare_row', [$row, $source, $migration])
+      ->willReturn([TRUE, FALSE, TRUE])
+      ->shouldBeCalled();
+    $module_handler->invokeAll('migrate_' . $migration->id() . '_prepare_row', [$row, $source, $migration])
+      ->willReturn([TRUE, TRUE])
+      ->shouldBeCalled();
+    $source->setModuleHandler($module_handler->reveal());
+
+    $this->idMap->expects($this->once())
+      ->method('saveIdMapping')
+      ->with($row, [], MigrateIdMapInterface::STATUS_IGNORED);
+
+    $this->assertFalse($source->prepareRow($row));
+  }
+
+  /**
+   * Test that migrate specific prepare hooks can skip rows.
+   *
+   * @covers ::prepareRow
+   */
+  public function testPrepareRowMigratePrepareSkip() {
+    $this->migrationConfiguration['id'] = 'test_migration';
+
+    $migration = $this->getMigration();
+    $source = new StubSourcePlugin([], '', [], $migration);
+    $row = new Row();
+
+    $module_handler = $this->prophesize(ModuleHandlerInterface::class);
+    // Return a failure from a prepare row hook.
+    $module_handler->invokeAll('migrate_prepare_row', [$row, $source, $migration])
+      ->willReturn([TRUE, TRUE])
+      ->shouldBeCalled();
+    $module_handler->invokeAll('migrate_' . $migration->id() . '_prepare_row', [$row, $source, $migration])
+      ->willReturn([TRUE, FALSE, TRUE])
+      ->shouldBeCalled();
+    $source->setModuleHandler($module_handler->reveal());
+
+    $this->idMap->expects($this->once())
+      ->method('saveIdMapping')
+      ->with($row, [], MigrateIdMapInterface::STATUS_IGNORED);
+
+    $this->assertFalse($source->prepareRow($row));
+  }
+
+  /**
+   * Test that a skip exception during prepare hooks correctly skips.
+   *
+   * @covers ::prepareRow
+   */
+  public function testPrepareRowPrepareException() {
+    $this->migrationConfiguration['id'] = 'test_migration';
+
+    $migration = $this->getMigration();
+    $source = new StubSourcePlugin([], '', [], $migration);
+    $row = new Row();
+
+    $module_handler = $this->prophesize(ModuleHandlerInterface::class);
+    // Return a failure from a prepare row hook.
+    $module_handler->invokeAll('migrate_prepare_row', [$row, $source, $migration])
+      ->willReturn([TRUE, TRUE])
+      ->shouldBeCalled();
+    $module_handler->invokeAll('migrate_' . $migration->id() . '_prepare_row', [$row, $source, $migration])
+      ->willThrow(new MigrateSkipRowException())
+      ->shouldBeCalled();
+    $source->setModuleHandler($module_handler->reveal());
+
+    // This will only be called on the first prepare because the second
+    // explicitly avoids it.
+    $this->idMap->expects($this->once())
+      ->method('saveIdMapping')
+      ->with($row, [], MigrateIdMapInterface::STATUS_IGNORED);
+    $this->assertFalse($source->prepareRow($row));
+
+    // Throw an exception the second time that avoids mapping.
+    $e = new MigrateSkipRowException('', FALSE);
+    $module_handler->invokeAll('migrate_' . $migration->id() . '_prepare_row', [$row, $source, $migration])
+      ->willThrow($e)
+      ->shouldBeCalled();
+    $this->assertFalse($source->prepareRow($row));
+  }
+
+  /**
+   * Test that cacheCounts, skipCount, trackChanges preserve their default
+   * values.
+   */
+  public function testDefaultPropertiesValues() {
+    $this->migrationConfiguration['id'] = 'test_migration';
+    $migration = $this->getMigration();
+    $source = new StubSourceGeneratorPlugin([], '', [], $migration);
+
+    // Test the default value of the skipCount Value;
+    $this->assertTrue($source->getSkipCount());
+    $this->assertTrue($source->getCacheCounts());
+    $this->assertTrue($source->getTrackChanges());
+  }
+
+  /**
+   * Gets a mock executable for the test.
+   *
+   * @param \Drupal\migrate\Plugin\MigrationInterface $migration
+   *   The migration entity.
+   *
+   * @return \Drupal\migrate\MigrateExecutable
+   *   The migrate executable.
+   */
+  protected function getMigrateExecutable($migration) {
+    /** @var \Drupal\migrate\MigrateMessageInterface $message */
+    $message = $this->getMock('Drupal\migrate\MigrateMessageInterface');
+    /** @var \Symfony\Component\EventDispatcher\EventDispatcherInterface $event_dispatcher */
+    $event_dispatcher = $this->getMock('Symfony\Component\EventDispatcher\EventDispatcherInterface');
+    return new MigrateExecutable($migration, $message, $event_dispatcher);
+  }
+
+}
+
+/**
+ * Stubbed source plugin for testing base class implementations.
+ */
+class StubSourcePlugin extends SourcePluginBase {
+
+  /**
+   * Helper for setting internal module handler implementation.
+   *
+   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
+   *   The module handler.
+   */
+  public function setModuleHandler(ModuleHandlerInterface $module_handler) {
+    $this->moduleHandler = $module_handler;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fields() {
+    return [];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function __toString() {
+    return '';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getIds() {
+    return [];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function initializeIterator() {
+    return [];
+  }
+
+}
+
+/**
+ * Stubbed source plugin with a generator as iterator. Also it overwrites the
+ * $skipCount, $cacheCounts and $trackChanges properties.
+ */
+class StubSourceGeneratorPlugin extends StubSourcePlugin {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $skipCount = TRUE;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $cacheCounts = TRUE;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $trackChanges = TRUE;
+
+  /**
+   * Return the skipCount value.
+   */
+  public function getSkipCount() {
+    return $this->skipCount;
+  }
+
+  /**
+   * Return the cacheCounts value.
+   */
+  public function getCacheCounts() {
+    return $this->cacheCounts;
+  }
+
+  /**
+   * Return the trackChanges value.
+   */
+  public function getTrackChanges() {
+    return $this->trackChanges;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function initializeIterator() {
+    $data = [
+      ['title' => 'foo'],
+      ['title' => 'bar'],
+      ['title' => 'iggy'],
+    ];
+    foreach ($data as $row) {
+      yield $row;
+    }
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/MigrateSqlIdMapEnsureTablesTest.php

@@ -0,0 +1,229 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit;
+
+use Drupal\migrate\Plugin\MigrateIdMapInterface;
+
+/**
+ * Tests the SQL ID map plugin ensureTables() method.
+ *
+ * @group migrate
+ */
+class MigrateSqlIdMapEnsureTablesTest extends MigrateTestCase {
+
+  /**
+   * The migration configuration, initialized to set the ID and destination IDs.
+   *
+   * @var array
+   */
+  protected $migrationConfiguration = array(
+    'id' => 'sql_idmap_test',
+  );
+
+  /**
+   * Tests the ensureTables method when the tables do not exist.
+   */
+  public function testEnsureTablesNotExist() {
+    $fields['source_ids_hash'] = Array(
+      'type' => 'varchar',
+      'length' => 64,
+      'not null' => 1,
+      'description' => 'Hash of source ids. Used as primary key'
+    );
+    $fields['sourceid1'] = array(
+      'type' => 'int',
+      'not null' => TRUE,
+    );
+    $fields['destid1'] = array(
+      'type' => 'varchar',
+      'length' => 255,
+      'not null' => FALSE,
+    );
+    $fields['source_row_status'] = array(
+      'type' => 'int',
+      'size' => 'tiny',
+      'unsigned' => TRUE,
+      'not null' => TRUE,
+      'default' => MigrateIdMapInterface::STATUS_IMPORTED,
+      'description' => 'Indicates current status of the source row',
+    );
+    $fields['rollback_action'] = array(
+      'type' => 'int',
+      'size' => 'tiny',
+      'unsigned' => TRUE,
+      'not null' => TRUE,
+      'default' => MigrateIdMapInterface::ROLLBACK_DELETE,
+      'description' => 'Flag indicating what to do for this item on rollback',
+    );
+    $fields['last_imported'] = array(
+      'type' => 'int',
+      'unsigned' => TRUE,
+      'not null' => TRUE,
+      'default' => 0,
+      'description' => 'UNIX timestamp of the last time this row was imported',
+    );
+    $fields['hash'] = array(
+      'type' => 'varchar',
+      'length' => '64',
+      'not null' => FALSE,
+      'description' => 'Hash of source row data, for detecting changes',
+    );
+    $map_table_schema = array(
+      'description' => 'Mappings from source identifier value(s) to destination identifier value(s).',
+      'fields' => $fields,
+      'primary key' => array('source_ids_hash'),
+    );
+    $schema = $this->getMockBuilder('Drupal\Core\Database\Schema')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $schema->expects($this->at(0))
+      ->method('tableExists')
+      ->with('migrate_map_sql_idmap_test')
+      ->will($this->returnValue(FALSE));
+    $schema->expects($this->at(1))
+      ->method('createTable')
+      ->with('migrate_map_sql_idmap_test', $map_table_schema);
+    // Now do the message table.
+    $fields = array();
+    $fields['msgid'] = array(
+      'type' => 'serial',
+      'unsigned' => TRUE,
+      'not null' => TRUE,
+    );
+    $fields['source_ids_hash'] = Array(
+      'type' => 'varchar',
+      'length' => 64,
+      'not null' => 1,
+      'description' => 'Hash of source ids. Used as primary key'
+    );
+    $fields['level'] = array(
+      'type' => 'int',
+      'unsigned' => TRUE,
+      'not null' => TRUE,
+      'default' => 1,
+    );
+    $fields['message'] = array(
+      'type' => 'text',
+      'size' => 'medium',
+      'not null' => TRUE,
+    );
+    $table_schema = array(
+      'description' => 'Messages generated during a migration process',
+      'fields' => $fields,
+      'primary key' => array('msgid'),
+    );
+
+    $schema->expects($this->at(2))
+      ->method('tableExists')
+      ->with('migrate_message_sql_idmap_test')
+      ->will($this->returnValue(FALSE));
+    $schema->expects($this->at(3))
+      ->method('createTable')
+      ->with('migrate_message_sql_idmap_test', $table_schema);
+    $schema->expects($this->any())
+      ->method($this->anything());
+    $this->runEnsureTablesTest($schema);
+  }
+
+  /**
+   * Tests the ensureTables method when the tables exist.
+   */
+  public function testEnsureTablesExist() {
+    $schema = $this->getMockBuilder('Drupal\Core\Database\Schema')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $schema->expects($this->at(0))
+      ->method('tableExists')
+      ->with('migrate_map_sql_idmap_test')
+      ->will($this->returnValue(TRUE));
+    $schema->expects($this->at(1))
+      ->method('fieldExists')
+      ->with('migrate_map_sql_idmap_test', 'rollback_action')
+      ->will($this->returnValue(FALSE));
+    $field_schema = array(
+      'type' => 'int',
+      'size' => 'tiny',
+      'unsigned' => TRUE,
+      'not null' => TRUE,
+      'default' => 0,
+      'description' => 'Flag indicating what to do for this item on rollback',
+    );
+    $schema->expects($this->at(2))
+      ->method('addField')
+      ->with('migrate_map_sql_idmap_test', 'rollback_action', $field_schema);
+    $schema->expects($this->at(3))
+      ->method('fieldExists')
+      ->with('migrate_map_sql_idmap_test', 'hash')
+      ->will($this->returnValue(FALSE));
+    $field_schema = array(
+      'type' => 'varchar',
+      'length' => '64',
+      'not null' => FALSE,
+      'description' => 'Hash of source row data, for detecting changes',
+    );
+    $schema->expects($this->at(4))
+      ->method('addField')
+      ->with('migrate_map_sql_idmap_test', 'hash', $field_schema);
+    $schema->expects($this->at(5))
+      ->method('fieldExists')
+      ->with('migrate_map_sql_idmap_test', 'source_ids_hash')
+      ->will($this->returnValue(FALSE));
+    $field_schema = array(
+      'type' => 'varchar',
+      'length' => '64',
+      'not null' => TRUE,
+      'description' => 'Hash of source ids. Used as primary key',
+    );
+    $schema->expects($this->at(6))
+      ->method('addField')
+      ->with('migrate_map_sql_idmap_test', 'source_ids_hash', $field_schema);
+    $schema->expects($this->exactly(7))
+      ->method($this->anything());
+    $this->runEnsureTablesTest($schema);
+  }
+
+  /**
+   * Actually run the test.
+   *
+   * @param array $schema
+   *   The mock schema object with expectations set. The Sql constructor calls
+   *   ensureTables() which in turn calls this object and the expectations on
+   *   it are the actual test and there are no additional asserts added.
+   */
+  protected function runEnsureTablesTest($schema) {
+    $database = $this->getMockBuilder('Drupal\Core\Database\Connection')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $database->expects($this->any())
+      ->method('schema')
+      ->willReturn($schema);
+    $migration = $this->getMigration();
+    $plugin = $this->getMock('Drupal\migrate\Plugin\MigrateSourceInterface');
+    $plugin->expects($this->any())
+      ->method('getIds')
+      ->willReturn(array(
+      'source_id_property' => array(
+        'type' => 'integer',
+      ),
+    ));
+    $migration->expects($this->any())
+      ->method('getSourcePlugin')
+      ->willReturn($plugin);
+    $plugin = $this->getMock('Drupal\migrate\Plugin\MigrateSourceInterface');
+    $plugin->expects($this->any())
+      ->method('getIds')
+      ->willReturn(array(
+      'destination_id_property' => array(
+        'type' => 'string',
+      ),
+    ));
+    $migration->expects($this->any())
+      ->method('getDestinationPlugin')
+      ->willReturn($plugin);
+    /** @var \Symfony\Component\EventDispatcher\EventDispatcherInterface $event_dispatcher */
+    $event_dispatcher = $this->getMock('Symfony\Component\EventDispatcher\EventDispatcherInterface');
+    $map = new TestSqlIdMap($database, array(), 'sql', array(), $migration, $event_dispatcher);
+    $map->getDatabase();
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/MigrateSqlSourceTestCase.php

@@ -0,0 +1,175 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit;
+
+use Drupal\Core\Database\Query\SelectInterface;
+use Drupal\Core\DependencyInjection\ContainerBuilder;
+use Drupal\Core\DependencyInjection\ContainerNotInitializedException;
+use Drupal\Core\KeyValueStore\KeyValueFactoryInterface;
+use Drupal\Core\KeyValueStore\KeyValueStoreInterface;
+
+/**
+ * Base class for Migrate module source unit tests.
+ *
+ * @deprecated in Drupal 8.2.0, will be removed before Drupal 9.0.0. Use
+ * \Drupal\Tests\migrate\Kernel\MigrateSqlSourceTestBase instead.
+ */
+abstract class MigrateSqlSourceTestCase extends MigrateTestCase {
+
+  /**
+   * The tested source plugin.
+   *
+   * @var \Drupal\migrate_drupal\Plugin\migrate\source\DrupalSqlBase.
+   */
+  protected $source;
+
+  /**
+   * The database contents.
+   *
+   * Database contents represents a mocked database. It should contain an
+   * associative array with the table name as key, and as many nested arrays as
+   * the number of mocked rows. Each of those faked rows must be another array
+   * with the column name as the key and the value as the cell.
+   *
+   * @var array
+   */
+  protected $databaseContents = array();
+
+  /**
+   * The plugin class under test.
+   *
+   * The plugin system is not working during unit testing so the source plugin
+   * class needs to be manually specified.
+   *
+   * @var string
+   */
+  const PLUGIN_CLASS = '';
+
+  /**
+   * The high water mark at the beginning of the import operation.
+   *
+   * Once the migration is run, we save a mark of the migrated sources, so the
+   * migration can run again and update only new sources or changed sources.
+   *
+   * @var mixed
+   */
+  const ORIGINAL_HIGH_WATER = NULL;
+
+  /**
+   * Expected results after the source parsing.
+   *
+   * @var array
+   */
+  protected $expectedResults = array();
+
+  /**
+   * Expected count of source rows.
+   *
+   * @var int
+   */
+  protected $expectedCount = 0;
+
+  /**
+   * The source plugin instance under test.
+   *
+   * @var \Drupal\migrate\Plugin\MigrateSourceInterface
+   */
+  protected $plugin;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    $module_handler = $this->getMock('Drupal\Core\Extension\ModuleHandlerInterface');
+    $state = $this->getMock('Drupal\Core\State\StateInterface');
+    $entity_manager = $this->getMock('Drupal\Core\Entity\EntityManagerInterface');
+
+    // Mock a key-value store to return high-water values.
+    $key_value = $this->getMock(KeyValueStoreInterface::class);
+
+    // SourcePluginBase does not yet support full dependency injection so we
+    // need to make sure that \Drupal::keyValue() works as expected by mocking
+    // the keyvalue service.
+    $key_value_factory = $this->getMock(KeyValueFactoryInterface::class);
+    $key_value_factory
+      ->method('get')
+      ->with('migrate:high_water')
+      ->willReturn($key_value);
+
+    try {
+      $container = \Drupal::getContainer();
+    }
+    catch (ContainerNotInitializedException $e) {
+      $container = new ContainerBuilder();
+    }
+    $container->set('keyvalue', $key_value_factory);
+    \Drupal::setContainer($container);
+
+    $migration = $this->getMigration();
+    $migration->expects($this->any())
+      ->method('getHighWater')
+      ->will($this->returnValue(static::ORIGINAL_HIGH_WATER));
+
+    // Setup the plugin.
+    $plugin_class = static::PLUGIN_CLASS;
+    $plugin = new $plugin_class($this->migrationConfiguration['source'], $this->migrationConfiguration['source']['plugin'], array(), $migration, $state, $entity_manager);
+
+    // Do some reflection to set the database and moduleHandler.
+    $plugin_reflection = new \ReflectionClass($plugin);
+    $database_property = $plugin_reflection->getProperty('database');
+    $database_property->setAccessible(TRUE);
+    $module_handler_property = $plugin_reflection->getProperty('moduleHandler');
+    $module_handler_property->setAccessible(TRUE);
+
+    // Set the database and the module handler onto our plugin.
+    $database_property->setValue($plugin, $this->getDatabase($this->databaseContents + array('test_map' => array())));
+    $module_handler_property->setValue($plugin, $module_handler);
+
+    $plugin->setStringTranslation($this->getStringTranslationStub());
+    $migration->expects($this->any())
+      ->method('getSourcePlugin')
+      ->will($this->returnValue($plugin));
+    $this->source = $plugin;
+    $this->expectedCount = count($this->expectedResults);
+  }
+
+  /**
+   * Tests that the source returns the same rows as expected.
+   */
+  public function testRetrieval() {
+    $this->assertInstanceOf(SelectInterface::class, $this->source->query());
+    $this->queryResultTest($this->source, $this->expectedResults);
+  }
+
+  /**
+   * Tests that the source returns the row count expected.
+   */
+  public function testSourceCount() {
+    $count = $this->source->count();
+    $this->assertTrue(is_numeric($count));
+    $this->assertEquals($this->expectedCount, $count);
+  }
+
+  /**
+   * Tests the source defines a valid ID.
+   */
+  public function testSourceId() {
+    $this->assertNotEmpty($this->source->getIds());
+  }
+
+  /**
+   * Gets the value on a row for a given key.
+   *
+   * @param \Drupal\migrate\Row $row
+   *   The row identifier.
+   * @param string $key
+   *   The key identifier.
+   *
+   * @return mixed
+   *   The value on a row for a given key.
+   */
+  protected function getValue($row, $key) {
+    return $row->getSourceProperty($key);
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/MigrateTestCase.php

@@ -0,0 +1,213 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit;
+
+use Drupal\Core\Database\Driver\sqlite\Connection;
+use Drupal\Core\DependencyInjection\ContainerBuilder;
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * Provides setup and helper methods for Migrate module tests.
+ */
+abstract class MigrateTestCase extends UnitTestCase {
+
+  /**
+   * An array of migration configuration values.
+   *
+   * @var array
+   */
+  protected $migrationConfiguration = [];
+
+  /**
+   * The migration ID map.
+   *
+   * @var \Drupal\migrate\Plugin\MigrateIdMapInterface|\PHPUnit_Framework_MockObject_MockObject
+   */
+  protected $idMap;
+
+  /**
+   * Local store for mocking setStatus()/getStatus().
+   *
+   * @var \Drupal\migrate\Plugin\MigrationInterface::STATUS_*
+   */
+  protected $migrationStatus = MigrationInterface::STATUS_IDLE;
+
+  /**
+   * Retrieves a mocked migration.
+   *
+   * @return \Drupal\migrate\Plugin\MigrationInterface|\PHPUnit_Framework_MockObject_MockObject
+   *   The mocked migration.
+   */
+  protected function getMigration() {
+    $this->migrationConfiguration += ['migrationClass' => 'Drupal\migrate\Plugin\Migration'];
+    $this->idMap = $this->getMock('Drupal\migrate\Plugin\MigrateIdMapInterface');
+
+    $this->idMap
+      ->method('getQualifiedMapTableName')
+      ->willReturn('test_map');
+
+    $migration = $this->getMockBuilder($this->migrationConfiguration['migrationClass'])
+      ->disableOriginalConstructor()
+      ->getMock();
+
+    $migration->method('checkRequirements')
+      ->willReturn(TRUE);
+
+    $migration->method('getIdMap')
+      ->willReturn($this->idMap);
+
+    // We need the state to be toggled throughout the test so we store the value
+    // on the test class and use a return callback.
+    $migration->expects($this->any())
+      ->method('getStatus')
+      ->willReturnCallback(function() {
+        return $this->migrationStatus;
+      });
+    $migration->expects($this->any())
+      ->method('setStatus')
+      ->willReturnCallback(function($status) {
+        $this->migrationStatus = $status;
+      });
+
+    $migration->method('getMigrationDependencies')
+      ->willReturn([
+        'required' => [],
+        'optional' => [],
+      ]);
+
+    $configuration = &$this->migrationConfiguration;
+
+    $migration->method('getHighWaterProperty')
+      ->willReturnCallback(function () use ($configuration) {
+        return isset($configuration['high_water_property']) ? $configuration['high_water_property'] : '';
+      });
+
+    $migration->method('set')
+      ->willReturnCallback(function ($argument, $value) use (&$configuration) {
+        $configuration[$argument] = $value;
+      });
+
+    $migration->method('id')
+      ->willReturn($configuration['id']);
+
+    return $migration;
+  }
+
+  /**
+   * Gets an SQLite database connection object for use in tests.
+   *
+   * @param array $database_contents
+   *   The database contents faked as an array. Each key is a table name, each
+   *   value is a list of table rows, an associative array of field => value.
+   * @param array $connection_options
+   *   (optional) Options for the database connection. Defaults to an empty
+   *   array.
+   *
+   * @return \Drupal\Core\Database\Driver\sqlite\Connection
+   *   The database connection.
+   */
+  protected function getDatabase(array $database_contents, $connection_options = []) {
+    if (extension_loaded('pdo_sqlite')) {
+      $connection_options['database'] = ':memory:';
+      $pdo = Connection::open($connection_options);
+      $connection = new Connection($pdo, $connection_options);
+    }
+    else {
+      $this->markTestSkipped('The pdo_sqlite extension is not available.');
+    }
+
+    // Initialize the DIC with a fake module handler for alterable queries.
+    $container = new ContainerBuilder();
+    $container->set('module_handler', $this->getMock('\Drupal\Core\Extension\ModuleHandlerInterface'));
+    \Drupal::setContainer($container);
+
+    // Create the tables and load them up with data, skipping empty ones.
+    foreach (array_filter($database_contents) as $table => $rows) {
+      $pilot_row = reset($rows);
+      $connection->schema()->createTable($table, $this->createSchemaFromRow($pilot_row));
+
+      $insert = $connection->insert($table)->fields(array_keys($pilot_row));
+      array_walk($rows, [$insert, 'values']);
+      $insert->execute();
+    }
+
+    return $connection;
+  }
+
+  /**
+   * Generates a table schema from a row.
+   *
+   * @param array $row
+   *   The reference row on which to base the schema.
+   *
+   * @return array
+   *   The Schema API-ready table schema.
+   */
+  protected function createSchemaFromRow(array $row) {
+    // SQLite uses loose ("affinity") typing, so it is OK for every column to be
+    // a text field.
+    $fields = array_map(function() { return ['type' => 'text']; }, $row);
+    return ['fields' => $fields];
+  }
+
+  /**
+   * Tests a query.
+   *
+   * @param array|\Traversable $iter
+   *   The countable. foreach-able actual results if a query is being run.
+   * @param array $expected_results
+   *   An array of expected results.
+   */
+  public function queryResultTest($iter, $expected_results) {
+    $this->assertSame(count($expected_results), count($iter), 'Number of results match');
+    $count = 0;
+    foreach ($iter as $data_row) {
+      $expected_row = $expected_results[$count];
+      $count++;
+      foreach ($expected_row as $key => $expected_value) {
+        $this->retrievalAssertHelper($expected_value, $this->getValue($data_row, $key), sprintf('Value matches for key "%s"', $key));
+      }
+    }
+    $this->assertSame(count($expected_results), $count);
+  }
+
+  /**
+   * Gets the value on a row for a given key.
+   *
+   * @param array $row
+   *   The row information.
+   * @param string $key
+   *   The key identifier.
+   *
+   * @return mixed
+   *   The value on a row for a given key.
+   */
+  protected function getValue($row, $key) {
+    return $row[$key];
+  }
+
+  /**
+   * Asserts tested values during test retrieval.
+   *
+   * @param mixed $expected_value
+   *   The incoming expected value to test.
+   * @param mixed $actual_value
+   *   The incoming value itself.
+   * @param string $message
+   *   The tested result as a formatted string.
+   */
+  protected function retrievalAssertHelper($expected_value, $actual_value, $message) {
+    if (is_array($expected_value)) {
+      // If the expected and actual values are empty, no need to array compare.
+      if (empty($expected_value && $actual_value)) {
+        return;
+      }
+      $this->assertArrayEquals($expected_value, $actual_value, $message);
+    }
+    else {
+      $this->assertSame((string) $expected_value, (string) $actual_value, $message);
+    }
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/MigrationPluginManagerTest.php

@@ -0,0 +1,220 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit;
+
+use Drupal\migrate\Plugin\Migration;
+use Drupal\migrate\Plugin\MigrationPluginManager;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * @coversDefaultClass \Drupal\migrate\Plugin\MigrationPluginManager
+ * @group migrate
+ */
+class MigrationPluginManagerTest extends UnitTestCase {
+
+  /**
+   * A plugin manager.
+   *
+   * @param \Drupal\migrate\Plugin\MigrationPluginManager $pluginManager
+   */
+  protected $pluginManager;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
+    parent::setUp();
+
+    // Get a plugin manager for testing.
+    $module_handler = $this->getMock('Drupal\Core\Extension\ModuleHandlerInterface');
+    $cache_backend = $this->getMock('Drupal\Core\Cache\CacheBackendInterface');
+    $language_manager = $this->getMock('Drupal\Core\Language\LanguageManagerInterface');
+    $this->pluginManager = new MigrationPluginManager($module_handler, $cache_backend, $language_manager);
+  }
+
+  /**
+   * Tests building dependencies for multiple migrations.
+   *
+   * @dataProvider dependencyProvider
+   */
+  public function testDependencyBuilding($migrations_data, $result_ids) {
+    $migrations = [];
+    foreach ($migrations_data as $migration_id => $migration_data) {
+      $migrations[$migration_id] = new TestMigrationMock($migration_id, $migration_data['dependencies']);
+    }
+
+    $ordered_migrations = $this->pluginManager->buildDependencyMigration($migrations, []);
+
+    // Verify results.
+    $this->assertEquals($result_ids, array_keys($ordered_migrations));
+    foreach ($migrations_data as $migration_id => $migration_data) {
+      $migration = $migrations[$migration_id];
+
+      $requirements = $migration_data['result_requirements'];
+      if (empty($requirements)) {
+        $this->assertEquals([], $migration->set);
+      }
+      else {
+        $requirements = array_combine($requirements, $requirements);
+
+        $this->assertEquals(1, count($migration->set));
+        list($set_prop, $set_requirements) = reset($migration->set);
+        $this->assertEquals('requirements', $set_prop);
+        $this->assertEquals($requirements, $set_requirements);
+      }
+    }
+  }
+
+  /**
+   * Provide dependency data for testing.
+   */
+  public function dependencyProvider() {
+    return [
+      // Just one migration, with no dependencies.
+      [
+        [
+          'm1' => [
+            'dependencies' => [],
+            'result_requirements' => [],
+          ],
+        ],
+        ['m1'],
+      ],
+
+      // Just one migration, with required dependencies.
+      [
+        [
+          'm1' => [
+            'dependencies' => [
+              'required' => ['required1', 'required2'],
+            ],
+            'result_requirements' => ['required1', 'required2'],
+          ],
+        ],
+        ['m1'],
+      ],
+
+      // Just one migration, with optional dependencies.
+      [
+        [
+          'm1' => [
+            'dependencies' => [
+              'optional' => ['optional1'],
+            ],
+            'result_requirements' => [],
+          ],
+        ],
+        ['m1'],
+      ],
+
+      // Multiple migrations.
+      [
+        [
+          'm1' => [
+            'dependencies' => [
+              'required' => ['required1', 'required2'],
+            ],
+            'result_requirements' => ['required1', 'required2'],
+          ],
+          'm2' => [
+            'dependencies' => [
+              'optional' => ['optional1'],
+            ],
+            'result_requirements' => [],
+          ],
+        ],
+        ['m1', 'm2'],
+      ],
+
+      // Multiple migrations, reordered due to optional requirement.
+      [
+        [
+          'm1' => [
+            'dependencies' => [
+              'optional' => ['m2'],
+            ],
+            'result_requirements' => [],
+          ],
+          'm2' => [
+            'dependencies' => [
+              'optional' => ['optional1'],
+            ],
+            'result_requirements' => [],
+          ],
+        ],
+        ['m2', 'm1'],
+      ],
+
+      // Ensure that optional requirements aren't turned into required ones,
+      // if the last migration has no optional deps.
+      [
+        [
+          'm1' => [
+            'dependencies' => [
+              'optional' => ['m2'],
+            ],
+            'result_requirements' => [],
+          ],
+          'm2' => [
+            'dependencies' => [],
+            'result_requirements' => [],
+          ],
+        ],
+        ['m2', 'm1'],
+      ],
+    ];
+  }
+
+}
+
+/**
+ * A mock migration plugin.
+ *
+ * Why are we using a custom class here?
+ *
+ * 1. The function buildDependencyMigration() calls $migration->set(), which
+ * is not actually in MigrationInterface.
+ *
+ * 2. The function buildDependencyMigration() calls array_multisort on an
+ * array with mocks in it. PHPUnit mocks are really complex, and if PHP tries
+ * to compare them it will die with "Nesting level too deep".
+ */
+class TestMigrationMock extends Migration {
+  /**
+   * The values passed into set().
+   *
+   * @var array $set
+   */
+  public $set = [];
+
+  /**
+   * TestMigrationMock constructor.
+   */
+  public function __construct($id, $dependencies) {
+    // Intentionally ignore parent constructor.
+    $this->id = $id;
+    $this->dependencies = $dependencies;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function id() {
+    return $this->id;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getMigrationDependencies() {
+    return $this->dependencies;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function set($prop, $value) {
+    $this->set[] = func_get_args();
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/MigrationTest.php

@@ -0,0 +1,181 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\migrate\Unit\MigrationTest.
+ */
+
+namespace Drupal\Tests\migrate\Unit;
+
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate\Plugin\Migration;
+use Drupal\migrate\Exception\RequirementsException;
+use Drupal\migrate\Plugin\MigrateDestinationInterface;
+use Drupal\migrate\Plugin\MigrateSourceInterface;
+use Drupal\migrate\Plugin\MigrationPluginManagerInterface;
+use Drupal\migrate\Plugin\RequirementsInterface;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * @coversDefaultClass \Drupal\migrate\Plugin\Migration
+ *
+ * @group Migration
+ */
+class MigrationTest extends UnitTestCase {
+
+  /**
+   * Tests checking requirements for source plugins.
+   *
+   * @covers ::checkRequirements
+   *
+   * @expectedException \Drupal\migrate\Exception\RequirementsException
+   * @expectedExceptionMessage Missing source requirement
+   */
+  public function testRequirementsForSourcePlugin() {
+    $migration = new TestMigration();
+
+    $source_plugin = $this->getMock('Drupal\Tests\migrate\Unit\RequirementsAwareSourceInterface');
+    $source_plugin->expects($this->once())
+      ->method('checkRequirements')
+      ->willThrowException(new RequirementsException('Missing source requirement', ['key' => 'value']));
+    $destination_plugin = $this->getMock('Drupal\Tests\migrate\Unit\RequirementsAwareDestinationInterface');
+
+    $migration->setSourcePlugin($source_plugin);
+    $migration->setDestinationPlugin($destination_plugin);
+
+    $migration->checkRequirements();
+  }
+
+  /**
+   * Tests checking requirements for destination plugins.
+   *
+   * @covers ::checkRequirements
+   *
+   * @expectedException \Drupal\migrate\Exception\RequirementsException
+   * @expectedExceptionMessage Missing destination requirement
+   */
+  public function testRequirementsForDestinationPlugin() {
+    $migration = new TestMigration();
+
+    $source_plugin = $this->getMock('Drupal\migrate\Plugin\MigrateSourceInterface');
+    $destination_plugin = $this->getMock('Drupal\Tests\migrate\Unit\RequirementsAwareDestinationInterface');
+    $destination_plugin->expects($this->once())
+      ->method('checkRequirements')
+      ->willThrowException(new RequirementsException('Missing destination requirement', ['key' => 'value']));
+
+    $migration->setSourcePlugin($source_plugin);
+    $migration->setDestinationPlugin($destination_plugin);
+
+    $migration->checkRequirements();
+  }
+
+  /**
+   * Tests checking requirements for destination plugins.
+   *
+   * @covers ::checkRequirements
+   *
+   * @expectedException \Drupal\migrate\Exception\RequirementsException
+   * @expectedExceptionMessage Missing migrations test_a, test_c
+   */
+  public function testRequirementsForMigrations() {
+    $migration = new TestMigration();
+
+    // Setup source and destination plugins without any requirements.
+    $source_plugin = $this->getMock('Drupal\migrate\Plugin\MigrateSourceInterface');
+    $destination_plugin = $this->getMock('Drupal\migrate\Plugin\MigrateDestinationInterface');
+    $migration->setSourcePlugin($source_plugin);
+    $migration->setDestinationPlugin($destination_plugin);
+
+    $plugin_manager = $this->getMock('Drupal\migrate\Plugin\MigrationPluginManagerInterface');
+    $migration->setMigrationPluginManager($plugin_manager);
+
+    // We setup the requirements that test_a doesn't exist and test_c is not
+    // completed yet.
+    $migration->setRequirements(['test_a', 'test_b', 'test_c', 'test_d']);
+
+    $migration_b = $this->getMock(MigrationInterface::class);
+    $migration_c = $this->getMock(MigrationInterface::class);
+    $migration_d = $this->getMock(MigrationInterface::class);
+
+    $migration_b->expects($this->once())
+      ->method('allRowsProcessed')
+      ->willReturn(TRUE);
+    $migration_c->expects($this->once())
+      ->method('allRowsProcessed')
+      ->willReturn(FALSE);
+    $migration_d->expects($this->once())
+      ->method('allRowsProcessed')
+      ->willReturn(TRUE);
+
+    $plugin_manager->expects($this->once())
+      ->method('createInstances')
+      ->with(['test_a', 'test_b', 'test_c', 'test_d'])
+      ->willReturn(['test_b' => $migration_b, 'test_c' => $migration_c, 'test_d' => $migration_d]);
+
+    $migration->checkRequirements();
+  }
+
+}
+
+/**
+ * Defines the TestMigration class.
+ */
+class TestMigration extends Migration {
+
+  /**
+   * Constructs an instance of TestMigration object.
+   */
+  public function __construct() {
+  }
+
+  /**
+   * Sets the requirements values.
+   *
+   * @param array $requirements
+   *   The array of requirement values.
+   */
+  public function setRequirements(array $requirements) {
+    $this->requirements = $requirements;
+  }
+
+  /**
+   * Sets the source Plugin.
+   *
+   * @param \Drupal\migrate\Plugin\MigrateSourceInterface $source_plugin
+   *   The source Plugin.
+   */
+  public function setSourcePlugin(MigrateSourceInterface $source_plugin) {
+    $this->sourcePlugin = $source_plugin;
+  }
+
+  /**
+   * Sets the destination Plugin.
+   *
+   * @param \Drupal\migrate\Plugin\MigrateDestinationInterface $destination_plugin
+   *   The destination Plugin.
+   */
+  public function setDestinationPlugin(MigrateDestinationInterface $destination_plugin) {
+    $this->destinationPlugin = $destination_plugin;
+  }
+
+  /**
+   * Sets the plugin manager service.
+   *
+   * @param \Drupal\migrate\Plugin\MigrationPluginManagerInterface $plugin_manager
+   *   The plugin manager service.
+   */
+  public function setMigrationPluginManager(MigrationPluginManagerInterface $plugin_manager) {
+    $this->migrationPluginManager = $plugin_manager;
+  }
+
+}
+
+/**
+ * Defines the RequirementsAwareSourceInterface.
+ */
+interface RequirementsAwareSourceInterface extends MigrateSourceInterface, RequirementsInterface {}
+
+/**
+ * Defines the RequirementsAwareDestinationInterface.
+ */
+interface RequirementsAwareDestinationInterface extends MigrateDestinationInterface, RequirementsInterface {}

web/core/modules/migrate/tests/src/Unit/Plugin/migrate/destination/EntityContentBaseTest.php

@@ -0,0 +1,173 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\migrate\Unit\Plugin\migrate\destination\EntityContentBaseTest
+ */
+
+namespace Drupal\Tests\migrate\Unit\Plugin\migrate\destination;
+
+use Drupal\Core\Entity\ContentEntityInterface;
+use Drupal\Core\Entity\ContentEntityType;
+use Drupal\Core\Entity\EntityManagerInterface;
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Field\BaseFieldDefinition;
+use Drupal\Core\Field\FieldTypePluginManagerInterface;
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate\Plugin\migrate\destination\EntityContentBase;
+use Drupal\migrate\Plugin\MigrateIdMapInterface;
+use Drupal\migrate\Row;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * Tests base entity migration destination functionality.
+ *
+ * @coversDefaultClass \Drupal\migrate\Plugin\migrate\destination\EntityContentBase
+ * @group migrate
+ */
+class EntityContentBaseTest extends UnitTestCase {
+
+  /**
+   * @var \Drupal\migrate\Plugin\MigrationInterface
+   */
+  protected $migration;
+
+  /**
+   * @var \Drupal\Core\Entity\EntityStorageInterface
+   */
+  protected $storage;
+
+  /**
+   * @var \Drupal\Core\Entity\EntityManagerInterface
+   */
+  protected $entityManager;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $this->migration = $this->prophesize(MigrationInterface::class);
+    $this->storage = $this->prophesize(EntityStorageInterface::class);
+    $this->entityManager = $this->prophesize(EntityManagerInterface::class);
+  }
+
+  /**
+   * Test basic entity save.
+   *
+   * @covers ::import
+   */
+  public function testImport() {
+    $bundles = [];
+    $destination = new EntityTestDestination([], '', [],
+      $this->migration->reveal(),
+      $this->storage->reveal(),
+      $bundles,
+      $this->entityManager->reveal(),
+      $this->prophesize(FieldTypePluginManagerInterface::class)->reveal());
+    $entity = $this->prophesize(ContentEntityInterface::class);
+    // Assert that save is called.
+    $entity->save()
+      ->shouldBeCalledTimes(1);
+    // Set an id for the entity
+    $entity->id()
+      ->willReturn(5);
+    $destination->setEntity($entity->reveal());
+    // Ensure the id is saved entity id is returned from import.
+    $this->assertEquals([5], $destination->import(new Row()));
+    // Assert that import set the rollback action.
+    $this->assertEquals(MigrateIdMapInterface::ROLLBACK_DELETE, $destination->rollbackAction());
+  }
+
+  /**
+   * Test row skipping when we can't get an entity to save.
+   *
+   * @covers ::import
+   * @expectedException \Drupal\migrate\MigrateException
+   * @expectedExceptionMessage Unable to get entity
+   */
+  public function testImportEntityLoadFailure() {
+    $bundles = [];
+    $destination = new EntityTestDestination([], '', [],
+      $this->migration->reveal(),
+      $this->storage->reveal(),
+      $bundles,
+      $this->entityManager->reveal(),
+      $this->prophesize(FieldTypePluginManagerInterface::class)->reveal());
+    $destination->setEntity(FALSE);
+    $destination->import(new Row());
+  }
+
+  /**
+   * Test that translation destination fails for untranslatable entities.
+   *
+   * @expectedException \Drupal\migrate\MigrateException
+   * @expectedExceptionMessage This entity type does not support translation
+   */
+  public function testUntranslatable() {
+    // An entity type without a language.
+    $entity_type = $this->prophesize(ContentEntityType::class);
+    $entity_type->getKey('langcode')->willReturn('');
+    $entity_type->getKey('id')->willReturn('id');
+    $this->entityManager->getBaseFieldDefinitions('foo')
+      ->willReturn(['id' => BaseFieldDefinitionTest::create('integer')]);
+
+    $this->storage->getEntityType()->willReturn($entity_type->reveal());
+
+    $destination = new EntityTestDestination(
+      [ 'translations' => TRUE ],
+      '',
+      [],
+      $this->migration->reveal(),
+      $this->storage->reveal(),
+      [],
+      $this->entityManager->reveal(),
+      $this->prophesize(FieldTypePluginManagerInterface::class)->reveal()
+    );
+    $destination->getIds();
+  }
+
+}
+
+/**
+ * Stub class for testing EntityContentBase methods.
+ *
+ * We want to test things without testing the base class implementations.
+ */
+class EntityTestDestination extends EntityContentBase {
+
+  private $entity = NULL;
+
+  public function setEntity($entity) {
+    $this->entity = $entity;
+  }
+
+  protected function getEntity(Row $row, array $old_destination_id_values) {
+    return $this->entity;
+  }
+
+  public static function getEntityTypeId($plugin_id) {
+    return 'foo';
+  }
+
+}
+
+/**
+ * Stub class for BaseFieldDefinition.
+ */
+class BaseFieldDefinitionTest extends BaseFieldDefinition {
+
+  public static function create($type) {
+    return new static([]);
+  }
+
+  public function getSettings() {
+    return [];
+  }
+
+  public function getType() {
+    return 'integer';
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/RowTest.php

@@ -0,0 +1,245 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit;
+
+use Drupal\migrate\Plugin\MigrateIdMapInterface;
+use Drupal\migrate\Row;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * @coversDefaultClass \Drupal\migrate\Row
+ * @group migrate
+ */
+class RowTest extends UnitTestCase {
+
+  /**
+   * The source IDs.
+   *
+   * @var array
+   */
+  protected $testSourceIds = array(
+    'nid' => 'Node ID',
+  );
+
+  /**
+   * The test values.
+   *
+   * @var array
+   */
+  protected $testValues = array(
+    'nid' => 1,
+    'title' => 'node 1',
+  );
+
+  /**
+   * The test hash.
+   *
+   * @var string
+   */
+  protected $testHash = '85795d4cde4a2425868b812cc88052ecd14fc912e7b9b4de45780f66750e8b1e';
+
+  /**
+   * The test hash after changing title value to 'new title'.
+   *
+   * @var string
+   */
+  protected $testHashMod = '9476aab0b62b3f47342cc6530441432e5612dcba7ca84115bbab5cceaca1ecb3';
+
+  /**
+   * Tests object creation: empty.
+   */
+  public function testRowWithoutData() {
+    $row = new Row();
+    $this->assertSame(array(), $row->getSource(), 'Empty row');
+  }
+
+  /**
+   * Tests object creation: basic.
+   */
+  public function testRowWithBasicData() {
+    $row = new Row($this->testValues, $this->testSourceIds);
+    $this->assertSame($this->testValues, $row->getSource(), 'Row with data, simple id.');
+  }
+
+  /**
+   * Tests object creation: multiple source IDs.
+   */
+  public function testRowWithMultipleSourceIds() {
+    $multi_source_ids = $this->testSourceIds + array('vid' => 'Node revision');
+    $multi_source_ids_values = $this->testValues + array('vid' => 1);
+    $row = new Row($multi_source_ids_values, $multi_source_ids);
+    $this->assertSame($multi_source_ids_values, $row->getSource(), 'Row with data, multifield id.');
+  }
+
+  /**
+   * Tests object creation: invalid values.
+   *
+   * @expectedException \Exception
+   */
+  public function testRowWithInvalidData() {
+    $invalid_values = array(
+      'title' => 'node X',
+    );
+    $row = new Row($invalid_values, $this->testSourceIds);
+  }
+
+  /**
+   * Tests source immutability after freeze.
+   *
+   * @expectedException \Exception
+   */
+  public function testSourceFreeze() {
+    $row = new Row($this->testValues, $this->testSourceIds);
+    $row->rehash();
+    $this->assertSame($this->testHash, $row->getHash(), 'Correct hash.');
+    $row->setSourceProperty('title', 'new title');
+    $row->rehash();
+    $this->assertSame($this->testHashMod, $row->getHash(), 'Hash changed correctly.');
+    $row->freezeSource();
+    $row->setSourceProperty('title', 'new title');
+  }
+
+  /**
+   * Tests setting on a frozen row.
+   *
+   * @expectedException \Exception
+   * @expectedExceptionMessage The source is frozen and can't be changed any more
+   */
+  public function testSetFrozenRow() {
+    $row = new Row($this->testValues, $this->testSourceIds);
+    $row->freezeSource();
+    $row->setSourceProperty('title', 'new title');
+  }
+
+  /**
+   * Tests hashing.
+   */
+  public function testHashing() {
+    $row = new Row($this->testValues, $this->testSourceIds);
+    $this->assertSame('', $row->getHash(), 'No hash at creation');
+    $row->rehash();
+    $this->assertSame($this->testHash, $row->getHash(), 'Correct hash.');
+    $row->rehash();
+    $this->assertSame($this->testHash, $row->getHash(), 'Correct hash even doing it twice.');
+
+    // Set the map to needs update.
+    $test_id_map = array(
+      'original_hash' => '',
+      'hash' => '',
+      'source_row_status' => MigrateIdMapInterface::STATUS_NEEDS_UPDATE,
+    );
+    $row->setIdMap($test_id_map);
+    $this->assertTrue($row->needsUpdate());
+
+    $row->rehash();
+    $this->assertSame($this->testHash, $row->getHash(), 'Correct hash even if id_mpa have changed.');
+    $row->setSourceProperty('title', 'new title');
+    $row->rehash();
+    $this->assertSame($this->testHashMod, $row->getHash(), 'Hash changed correctly.');
+    // Check hash calculation algorithm.
+    $hash = hash('sha256', serialize($row->getSource()));
+    $this->assertSame($hash, $row->getHash());
+    // Check length of generated hash used for mapping schema.
+    $this->assertSame(64, strlen($row->getHash()));
+
+    // Set the map to successfully imported.
+    $test_id_map = array(
+      'original_hash' => '',
+      'hash' => '',
+      'source_row_status' => MigrateIdMapInterface::STATUS_IMPORTED,
+    );
+    $row->setIdMap($test_id_map);
+    $this->assertFalse($row->needsUpdate());
+
+    // Set the same hash value and ensure it was not changed.
+    $random = $this->randomMachineName();
+    $test_id_map = array(
+      'original_hash' => $random,
+      'hash' => $random,
+      'source_row_status' => MigrateIdMapInterface::STATUS_NEEDS_UPDATE,
+    );
+    $row->setIdMap($test_id_map);
+    $this->assertFalse($row->changed());
+
+    // Set different has values to ensure it is marked as changed.
+    $test_id_map = array(
+      'original_hash' => $this->randomMachineName(),
+      'hash' => $this->randomMachineName(),
+      'source_row_status' => MigrateIdMapInterface::STATUS_NEEDS_UPDATE,
+    );
+    $row->setIdMap($test_id_map);
+    $this->assertTrue($row->changed());
+  }
+
+  /**
+   * Tests getting/setting the ID Map.
+   *
+   * @covers ::setIdMap
+   * @covers ::getIdMap
+   */
+  public function testGetSetIdMap() {
+    $row = new Row($this->testValues, $this->testSourceIds);
+    $test_id_map = array(
+      'original_hash' => '',
+      'hash' => '',
+      'source_row_status' => MigrateIdMapInterface::STATUS_NEEDS_UPDATE,
+    );
+    $row->setIdMap($test_id_map);
+    $this->assertEquals($test_id_map, $row->getIdMap());
+  }
+
+  /**
+   * Tests the source ID.
+   */
+  public function testSourceIdValues() {
+    $row = new Row($this->testValues, $this->testSourceIds);
+    $this->assertSame(array('nid' => $this->testValues['nid']), $row->getSourceIdValues());
+  }
+
+  /**
+   * Tests getting the source property.
+   *
+   * @covers ::getSourceProperty
+   */
+  public function testGetSourceProperty() {
+    $row = new Row($this->testValues, $this->testSourceIds);
+    $this->assertSame($this->testValues['nid'], $row->getSourceProperty('nid'));
+    $this->assertSame($this->testValues['title'], $row->getSourceProperty('title'));
+    $this->assertNull($row->getSourceProperty('non_existing'));
+  }
+
+  /**
+   * Tests setting and getting the destination.
+   */
+  public function testDestination() {
+    $row = new Row($this->testValues, $this->testSourceIds);
+    $this->assertEmpty($row->getDestination());
+    $this->assertFalse($row->hasDestinationProperty('nid'));
+
+    // Set a destination.
+    $row->setDestinationProperty('nid', 2);
+    $this->assertTrue($row->hasDestinationProperty('nid'));
+    $this->assertEquals(array('nid' => 2), $row->getDestination());
+  }
+
+  /**
+   * Tests setting/getting multiple destination IDs.
+   */
+  public function testMultipleDestination() {
+    $row = new Row($this->testValues, $this->testSourceIds);
+    // Set some deep nested values.
+    $row->setDestinationProperty('image/alt', 'alt text');
+    $row->setDestinationProperty('image/fid', 3);
+
+    $this->assertTrue($row->hasDestinationProperty('image'));
+    $this->assertFalse($row->hasDestinationProperty('alt'));
+    $this->assertFalse($row->hasDestinationProperty('fid'));
+
+    $destination = $row->getDestination();
+    $this->assertEquals('alt text', $destination['image']['alt']);
+    $this->assertEquals(3, $destination['image']['fid']);
+    $this->assertEquals('alt text', $row->getDestinationProperty('image/alt'));
+    $this->assertEquals(3, $row->getDestinationProperty('image/fid'));
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/SqlBaseTest.php

@@ -0,0 +1,236 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\migrate\Unit\SqlBaseTest.
+ */
+
+namespace Drupal\Tests\migrate\Unit;
+
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate\Plugin\migrate\source\SqlBase;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * Tests the SqlBase class.
+ *
+ * @group migrate
+ */
+class SqlBaseTest extends UnitTestCase {
+
+  /**
+   * Tests that the ID map is joinable.
+   *
+   * @param bool $expected_result
+   *   The expected result.
+   * @param bool $id_map_is_sql
+   *   TRUE if we want getIdMap() to return an instance of Sql.
+   * @param bool $with_id_map
+   *   TRUE if we want the ID map to have a valid map of IDs.
+   * @param array $source_options
+   *   (optional) An array of connection options for the source connection.
+   *   Defaults to an empty array.
+   * @param array $idmap_options
+   *   (optional) An array of connection options for the ID map connection.
+   *   Defaults to an empty array.
+   *
+   * @dataProvider sqlBaseTestProvider
+   */
+  public function testMapJoinable($expected_result, $id_map_is_sql, $with_id_map, $source_options = [], $idmap_options = []) {
+    // Setup a connection object.
+    $source_connection = $this->getMockBuilder('Drupal\Core\Database\Connection')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $source_connection->expects($id_map_is_sql && $with_id_map ? $this->once() : $this->never())
+      ->method('getConnectionOptions')
+      ->willReturn($source_options);
+
+    // Setup the ID map connection.
+    $idmap_connection = $this->getMockBuilder('Drupal\Core\Database\Connection')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $idmap_connection->expects($id_map_is_sql && $with_id_map ? $this->once() : $this->never())
+      ->method('getConnectionOptions')
+      ->willReturn($idmap_options);
+
+    // Setup the Sql object.
+    $sql = $this->getMockBuilder('Drupal\migrate\Plugin\migrate\id_map\Sql')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $sql->expects($id_map_is_sql && $with_id_map ? $this->once() : $this->never())
+      ->method('getDatabase')
+      ->willReturn($idmap_connection);
+
+    // Setup a migration entity.
+    $migration = $this->getMock(MigrationInterface::class);
+    $migration->expects($with_id_map ? $this->once() : $this->never())
+      ->method('getIdMap')
+      ->willReturn($id_map_is_sql ? $sql : NULL);
+
+    // Create our SqlBase test class.
+    $sql_base = new TestSqlBase();
+    $sql_base->setMigration($migration);
+    $sql_base->setDatabase($source_connection);
+
+    // Configure the idMap to make the check in mapJoinable() pass.
+    if ($with_id_map) {
+      $sql_base->setIds([
+        'uid' => ['type' => 'integer', 'alias' => 'u'],
+      ]);
+    }
+
+    $this->assertEquals($expected_result, $sql_base->mapJoinable());
+  }
+
+  /**
+   * The data provider for SqlBase.
+   *
+   * @return array
+   *   An array of data per test run.
+   */
+  public function sqlBaseTestProvider() {
+    return [
+      // Source ids are empty so mapJoinable() is false.
+      [
+        FALSE,
+        FALSE,
+        FALSE,
+      ],
+      // Still false because getIdMap() is not a subclass of Sql.
+      [
+        FALSE,
+        FALSE,
+        TRUE,
+      ],
+      // Test mapJoinable() returns false when source and id connection options
+      // differ.
+      [
+        FALSE,
+        TRUE,
+        TRUE,
+        ['driver' => 'mysql', 'username' => 'different_from_map', 'password' => 'different_from_map'],
+        ['driver' => 'mysql', 'username' => 'different_from_source', 'password' => 'different_from_source'],
+      ],
+      // Returns true because source and id map connection options are the same.
+      [
+        TRUE,
+        TRUE,
+        TRUE,
+        ['driver' => 'pgsql', 'username' => 'same_value', 'password' => 'same_value'],
+        ['driver' => 'pgsql', 'username' => 'same_value', 'password' => 'same_value'],
+      ],
+      // Returns false because driver is sqlite and the databases are not the
+      // same.
+      [
+        FALSE,
+        TRUE,
+        TRUE,
+        ['driver' => 'sqlite', 'database' => '1.sqlite', 'username' => '', 'password' => ''],
+        ['driver' => 'sqlite', 'database' => '2.sqlite', 'username' => '', 'password' => ''],
+      ],
+      // Returns false because driver is not the same.
+      [
+        FALSE,
+        TRUE,
+        TRUE,
+        ['driver' => 'pgsql', 'username' => 'same_value', 'password' => 'same_value'],
+        ['driver' => 'mysql', 'username' => 'same_value', 'password' => 'same_value'],
+      ],
+    ];
+  }
+
+}
+
+/**
+ * Creates a base source class for SQL migration testing.
+ */
+class TestSqlBase extends SqlBase {
+
+  /**
+   * The database object.
+   *
+   * @var object
+   */
+  protected $database;
+
+  /**
+   * The migration IDs.
+   *
+   * @var array
+   */
+  protected $ids;
+
+  /**
+   * Override the constructor so we can create one easily.
+   */
+  public function __construct() {}
+
+  /**
+   * Allows us to set the database during tests.
+   *
+   * @param mixed $database
+   *   The database mock object.
+   */
+  public function setDatabase($database) {
+    $this->database = $database;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getDatabase() {
+    return $this->database;
+  }
+
+  /**
+   * Allows us to set the migration during the test.
+   *
+   * @param mixed $migration
+   *   The migration mock.
+   */
+  public function setMigration($migration) {
+    $this->migration = $migration;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function mapJoinable() {
+    return parent::mapJoinable();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getIds() {
+    return $this->ids;
+  }
+
+  /**
+   * Allows us to set the IDs during a test.
+   *
+   * @param array $ids
+   *   An array of identifiers.
+   */
+  public function setIds($ids) {
+    $this->ids = $ids;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fields() {}
+
+  /**
+   * {@inheritdoc}
+   */
+  public function query() {}
+
+  /**
+   * {@inheritdoc}
+   */
+  public function calculateDependencies() {
+    return [];
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/TestMigrateExecutable.php

@@ -0,0 +1,132 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit;
+
+use Drupal\Core\StringTranslation\TranslationInterface;
+use Drupal\migrate\MigrateExecutable;
+
+/**
+ * Tests MigrateExecutable.
+ */
+class TestMigrateExecutable extends MigrateExecutable {
+
+  /**
+   * The fake memory usage in bytes.
+   *
+   * @var int
+   */
+  protected $memoryUsage;
+
+  /**
+   * The cleared memory usage.
+   *
+   * @var int
+   */
+  protected $clearedMemoryUsage;
+
+  /**
+   * Sets the string translation service.
+   *
+   * @param \Drupal\Core\StringTranslation\TranslationInterface $string_translation
+   *   The translation manager.
+   */
+  public function setStringTranslation(TranslationInterface $string_translation) {
+    $this->stringTranslation = $string_translation;
+  }
+
+  /**
+   * Allows access to set protected source property.
+   *
+   * @param \Drupal\migrate\Plugin\MigrateSourceInterface $source
+   *   The value to set.
+   */
+  public function setSource($source) {
+    $this->source = $source;
+  }
+
+  /**
+   * Allows access to protected sourceIdValues property.
+   *
+   * @param array $source_id_values
+   *   The values to set.
+   */
+  public function setSourceIdValues($source_id_values) {
+    $this->sourceIdValues = $source_id_values;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function handleException(\Exception $exception, $save = TRUE) {
+    $message = $exception->getMessage();
+    if ($save) {
+      $this->saveMessage($message);
+    }
+    $this->message->display($message);
+  }
+
+  /**
+   * Allows access to the protected memoryExceeded method.
+   *
+   * @return bool
+   *   The memoryExceeded value.
+   */
+  public function memoryExceeded() {
+    return parent::memoryExceeded();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function attemptMemoryReclaim() {
+    return $this->clearedMemoryUsage;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getMemoryUsage() {
+    return $this->memoryUsage;
+  }
+
+  /**
+   * Sets the fake memory usage.
+   *
+   * @param int $memory_usage
+   *   The fake memory usage value.
+   * @param int $cleared_memory_usage
+   *   (optional) The fake cleared memory value. Defaults to NULL.
+   */
+  public function setMemoryUsage($memory_usage, $cleared_memory_usage = NULL) {
+    $this->memoryUsage = $memory_usage;
+    $this->clearedMemoryUsage = $cleared_memory_usage;
+  }
+
+  /**
+   * Sets the memory limit.
+   *
+   * @param int $memory_limit
+   *   The memory limit.
+   */
+  public function setMemoryLimit($memory_limit) {
+    $this->memoryLimit = $memory_limit;
+  }
+
+  /**
+   * Sets the memory threshold.
+   *
+   * @param float $threshold
+   *   The new threshold.
+   */
+  public function setMemoryThreshold($threshold) {
+    $this->memoryThreshold = $threshold;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function formatSize($size) {
+    return $size;
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/TestSqlIdMap.php

@@ -0,0 +1,79 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit;
+
+use Drupal\Core\Database\Connection;
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate\MigrateException;
+use Drupal\migrate\Plugin\migrate\id_map\Sql;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+
+/**
+ * Defines a SQL ID map for use in tests.
+ */
+class TestSqlIdMap extends Sql implements \Iterator {
+
+  /**
+   * Constructs a TestSqlIdMap object.
+   *
+   * @param \Drupal\Core\Database\Connection $database
+   *   The database.
+   * @param array $configuration
+   *   The configuration.
+   * @param string $plugin_id
+   *   The plugin ID for the migration process to do.
+   * @param mixed $plugin_definition
+   *   The configuration for the plugin.
+   * @param \Drupal\migrate\Plugin\MigrationInterface $migration
+   *   The migration to do.
+   * @param \Symfony\Component\EventDispatcher\EventDispatcherInterface $event_dispatcher
+   *   The event dispatcher service.
+   */
+  public function __construct(Connection $database, array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration, EventDispatcherInterface $event_dispatcher) {
+    $this->database = $database;
+    parent::__construct($configuration, $plugin_id, $plugin_definition, $migration, $event_dispatcher);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getDatabase() {
+    return parent::getDatabase();
+  }
+
+  /**
+   * Gets the field schema.
+   *
+   * @param array $id_definition
+   *   An array defining the field, with a key 'type'.
+   *
+   * @return array
+   *   A field schema depending on value of key 'type'.  An empty array is
+   *   returned if 'type' is not defined.
+   *
+   * @throws \Drupal\migrate\MigrateException
+   */
+  protected function getFieldSchema(array $id_definition) {
+    if (!isset($id_definition['type'])) {
+      return array();
+    }
+    switch ($id_definition['type']) {
+      case 'integer':
+        return array(
+          'type' => 'int',
+          'not null' => TRUE,
+        );
+
+      case 'string':
+        return array(
+          'type' => 'varchar',
+          'length' => 255,
+          'not null' => FALSE,
+        );
+
+      default:
+        throw new MigrateException($id_definition['type'] . ' not supported');
+    }
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/destination/ConfigTest.php

@@ -0,0 +1,112 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit\destination;
+
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate\Plugin\migrate\destination\Config;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * @coversDefaultClass \Drupal\migrate\Plugin\migrate\destination\Config
+ * @group migrate
+ */
+class ConfigTest extends UnitTestCase {
+
+  /**
+   * Test the import method.
+   */
+  public function testImport() {
+    $source = array(
+      'test' => 'x',
+    );
+    $migration = $this->getMockBuilder('Drupal\migrate\Plugin\Migration')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $config = $this->getMockBuilder('Drupal\Core\Config\Config')
+      ->disableOriginalConstructor()
+      ->getMock();
+    foreach ($source as $key => $val) {
+      $config->expects($this->once())
+        ->method('set')
+        ->with($this->equalTo($key), $this->equalTo($val))
+        ->will($this->returnValue($config));
+    }
+    $config->expects($this->once())
+      ->method('save');
+    $config->expects($this->once())
+      ->method('getName')
+      ->willReturn('d8_config');
+    $config_factory = $this->getMock('Drupal\Core\Config\ConfigFactoryInterface');
+    $config_factory->expects($this->once())
+      ->method('getEditable')
+      ->with('d8_config')
+      ->will($this->returnValue($config));
+    $row = $this->getMockBuilder('Drupal\migrate\Row')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $row->expects($this->any())
+      ->method('getRawDestination')
+      ->will($this->returnValue($source));
+    $language_manager = $this->getMockBuilder('Drupal\language\ConfigurableLanguageManagerInterface')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $language_manager->expects($this->never())
+      ->method('getLanguageConfigOverride')
+      ->with('fr', 'd8_config')
+      ->will($this->returnValue($config));
+    $destination = new Config(array('config_name' => 'd8_config'), 'd8_config', array('pluginId' => 'd8_config'), $migration, $config_factory, $language_manager);
+    $destination_id = $destination->import($row);
+    $this->assertEquals($destination_id, ['d8_config']);
+  }
+
+  /**
+   * Test the import method.
+   */
+  public function testLanguageImport() {
+    $source = array(
+      'langcode' => 'mi',
+    );
+    $migration = $this->getMockBuilder(MigrationInterface::class)
+      ->disableOriginalConstructor()
+      ->getMock();
+    $config = $this->getMockBuilder('Drupal\Core\Config\Config')
+      ->disableOriginalConstructor()
+      ->getMock();
+    foreach ($source as $key => $val) {
+      $config->expects($this->once())
+        ->method('set')
+        ->with($this->equalTo($key), $this->equalTo($val))
+        ->will($this->returnValue($config));
+    }
+    $config->expects($this->once())
+      ->method('save');
+    $config->expects($this->any())
+      ->method('getName')
+      ->willReturn('d8_config');
+    $config_factory = $this->getMock('Drupal\Core\Config\ConfigFactoryInterface');
+    $config_factory->expects($this->once())
+      ->method('getEditable')
+      ->with('d8_config')
+      ->will($this->returnValue($config));
+    $row = $this->getMockBuilder('Drupal\migrate\Row')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $row->expects($this->any())
+      ->method('getRawDestination')
+      ->will($this->returnValue($source));
+    $row->expects($this->any())
+      ->method('getDestinationProperty')
+      ->will($this->returnValue($source['langcode']));
+    $language_manager = $this->getMockBuilder('Drupal\language\ConfigurableLanguageManagerInterface')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $language_manager->expects($this->any())
+      ->method('getLanguageConfigOverride')
+      ->with('mi', 'd8_config')
+      ->will($this->returnValue($config));
+    $destination = new Config(array('config_name' => 'd8_config', 'translations' => 'true'), 'd8_config', array('pluginId' => 'd8_config'), $migration, $config_factory, $language_manager);
+    $destination_id = $destination->import($row);
+    $this->assertEquals($destination_id, ['d8_config', 'mi']);
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/destination/EntityRevisionTest.php

@@ -0,0 +1,228 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\migrate\Unit\destination\EntityRevisionTest.
+ */
+
+namespace Drupal\Tests\migrate\Unit\destination;
+
+use Drupal\Core\Entity\ContentEntityInterface;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate\Plugin\migrate\destination\EntityRevision as RealEntityRevision;
+use Drupal\migrate\Row;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * Tests entity revision destination.
+ *
+ * @group migrate
+ * @coversDefaultClass \Drupal\migrate\Plugin\migrate\destination\EntityRevision
+ */
+class EntityRevisionTest extends UnitTestCase {
+
+  /**
+   * @var \Drupal\migrate\Plugin\MigrationInterface
+   */
+  protected $migration;
+
+  /**
+   * @var \Drupal\Core\Entity\EntityStorageInterface
+   */
+  protected $storage;
+
+  /**
+   * @var \Drupal\Core\Entity\EntityManagerInterface
+   */
+  protected $entityManager;
+
+  /**
+   * @var \Drupal\Core\Field\FieldTypePluginManagerInterface
+   */
+  protected $fieldTypeManager;
+
+  protected function setUp() {
+    parent::setUp();
+
+    // Setup mocks to be used when creating a revision destination.
+    $this->migration = $this->prophesize(MigrationInterface::class);
+    $this->storage = $this->prophesize('\Drupal\Core\Entity\EntityStorageInterface');
+    $this->entityManager = $this->prophesize('\Drupal\Core\Entity\EntityManagerInterface');
+    $this->fieldTypeManager = $this->prophesize('\Drupal\Core\Field\FieldTypePluginManagerInterface');
+  }
+
+  /**
+   * Test that passed old destination values are used by default.
+   *
+   * @covers ::getEntity
+   */
+  public function testGetEntityDestinationValues() {
+    $destination = $this->getEntityRevisionDestination([]);
+    // Return a dummy because we don't care what gets called.
+    $entity = $this->prophesize('\Drupal\Core\Entity\EntityInterface')
+      ->willImplement('\Drupal\Core\Entity\RevisionableInterface');
+    // Assert that the first ID from the destination values is used to load the
+    // entity.
+    $this->storage->loadRevision(12)
+      ->shouldBeCalled()
+      ->willReturn($entity->reveal());
+    $row = new Row();
+    $this->assertEquals($entity->reveal(), $destination->getEntity($row, [12, 13]));
+  }
+
+  /**
+   * Test that revision updates update.
+   *
+   * @covers ::getEntity
+   */
+  public function testGetEntityUpdateRevision() {
+    $destination = $this->getEntityRevisionDestination([]);
+    $entity = $this->prophesize('\Drupal\Core\Entity\EntityInterface')
+      ->willImplement('\Drupal\Core\Entity\RevisionableInterface');
+
+    $entity_type = $this->prophesize('\Drupal\Core\Entity\EntityTypeInterface');
+    $entity_type->getKey('id')->willReturn('nid');
+    $entity_type->getKey('revision')->willReturn('vid');
+    $this->storage->getEntityType()->willReturn($entity_type->reveal());
+
+    // Assert we load the correct revision.
+    $this->storage->loadRevision(2)
+      ->shouldBeCalled()
+      ->willReturn($entity->reveal());
+    // Make sure its set as an update and not the default revision.
+    $entity->setNewRevision(FALSE)->shouldBeCalled();
+    $entity->isDefaultRevision(FALSE)->shouldBeCalled();
+
+    $row = new Row(['nid' => 1, 'vid' => 2], ['nid' => 1, 'vid' => 2]);
+    $row->setDestinationProperty('vid', 2);
+    $this->assertEquals($entity->reveal(), $destination->getEntity($row, []));
+  }
+
+  /**
+   * Test that new revisions are flagged to be written as new.
+   *
+   * @covers ::getEntity
+   */
+  public function testGetEntityNewRevision() {
+    $destination = $this->getEntityRevisionDestination([]);
+    $entity = $this->prophesize('\Drupal\Core\Entity\EntityInterface')
+      ->willImplement('\Drupal\Core\Entity\RevisionableInterface');
+
+    $entity_type = $this->prophesize('\Drupal\Core\Entity\EntityTypeInterface');
+    $entity_type->getKey('id')->willReturn('nid');
+    $entity_type->getKey('revision')->willReturn('vid');
+    $this->storage->getEntityType()->willReturn($entity_type->reveal());
+
+    // Enforce is new should be disabled.
+    $entity->enforceIsNew(FALSE)->shouldBeCalled();
+    // And toggle this as new revision but not the default revision.
+    $entity->setNewRevision(TRUE)->shouldBeCalled();
+    $entity->isDefaultRevision(FALSE)->shouldBeCalled();
+
+    // Assert we load the correct revision.
+    $this->storage->load(1)
+      ->shouldBeCalled()
+      ->willReturn($entity->reveal());
+
+    $row = new Row(['nid' => 1, 'vid' => 2], ['nid' => 1, 'vid' => 2]);
+    $row->setDestinationProperty('nid', 1);
+    $this->assertEquals($entity->reveal(), $destination->getEntity($row, []));
+  }
+
+  /**
+   * Test entity load failure.
+   *
+   * @covers ::getEntity
+   */
+  public function testGetEntityLoadFailure() {
+    $destination = $this->getEntityRevisionDestination([]);
+
+    $entity_type = $this->prophesize('\Drupal\Core\Entity\EntityTypeInterface');
+    $entity_type->getKey('id')->willReturn('nid');
+    $entity_type->getKey('revision')->willReturn('vid');
+    $this->storage->getEntityType()->willReturn($entity_type->reveal());
+
+    // Return a failed load and make sure we don't fail and we return FALSE.
+    $this->storage->load(1)
+      ->shouldBeCalled()
+      ->willReturn(FALSE);
+
+    $row = new Row(['nid' => 1, 'vid' => 2], ['nid' => 1, 'vid' => 2]);
+    $row->setDestinationProperty('nid', 1);
+    $this->assertFalse($destination->getEntity($row, []));
+  }
+
+  /**
+   * Test entity revision save.
+   *
+   * @covers ::save
+   */
+  public function testSave() {
+    $entity = $this->prophesize('\Drupal\Core\Entity\ContentEntityInterface');
+    $entity->save()
+      ->shouldBeCalled();
+    $entity->getRevisionId()
+      ->shouldBeCalled()
+      ->willReturn(1234);
+    $destination = $this->getEntityRevisionDestination();
+    $this->assertEquals([1234], $destination->save($entity->reveal(), []));
+  }
+
+
+  /**
+   * Helper method to create an entity revision destination with mock services.
+   *
+   * @see \Drupal\Tests\migrate\Unit\Destination\EntityRevision
+   *
+   * @param $configuration
+   *   Configuration for the destination.
+   * @param string $plugin_id
+   *   The plugin id.
+   * @param array $plugin_definition
+   *   The plugin definition.
+   *
+   * @return \Drupal\Tests\migrate\Unit\destination\EntityRevision
+   *   Mocked destination.
+   */
+  protected function getEntityRevisionDestination(array $configuration = [], $plugin_id = 'entity_revision', array $plugin_definition = []) {
+    return new EntityRevision($configuration, $plugin_id, $plugin_definition,
+      $this->migration->reveal(),
+      $this->storage->reveal(),
+      [],
+      $this->entityManager->reveal(),
+      $this->fieldTypeManager->reveal()
+    );
+  }
+
+}
+
+/**
+ * Mock that exposes from internal methods for testing.
+ */
+class EntityRevision extends RealEntityRevision {
+
+  /**
+   * Allow public access for testing.
+   */
+  public function getEntity(Row $row, array $old_destination_id_values) {
+    return parent::getEntity($row, $old_destination_id_values);
+  }
+
+  /**
+   * Allow public access for testing.
+   */
+  public function save(ContentEntityInterface $entity, array $old_destination_id_values = array()) {
+    return parent::save($entity, $old_destination_id_values);
+  }
+
+  /**
+   * Don't test method from base class.
+   *
+   * This method is from the parent and we aren't concerned with the inner
+   * workings of its implementation which would trickle into mock assertions. An
+   * empty implementation avoids this.
+   */
+  protected function updateEntity(EntityInterface $entity, Row $row) {}
+
+}

web/core/modules/migrate/tests/src/Unit/destination/PerComponentEntityDisplayTest.php

@@ -0,0 +1,67 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\migrate\Unit\destination\PerComponentEntityDisplayTest.
+ */
+
+namespace Drupal\Tests\migrate\Unit\destination;
+
+use Drupal\migrate\Plugin\migrate\destination\ComponentEntityDisplayBase;
+use Drupal\migrate\Row;
+use Drupal\Tests\migrate\Unit\MigrateTestCase;
+
+/**
+ * Tests the entity display destination plugin.
+ *
+ * @group migrate
+ */
+class PerComponentEntityDisplayTest extends MigrateTestCase {
+
+  /**
+   * Tests the entity display import method.
+   */
+  public function testImport() {
+    $values = array(
+      'entity_type' => 'entity_type_test',
+      'bundle' => 'bundle_test',
+      'view_mode' => 'view_mode_test',
+      'field_name' => 'field_name_test',
+      'options' => array('test setting'),
+    );
+    $row = new Row();
+    foreach ($values as $key => $value) {
+      $row->setDestinationProperty($key, $value);
+    }
+    $entity = $this->getMockBuilder('Drupal\Core\Entity\Entity\EntityViewDisplay')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $entity->expects($this->once())
+      ->method('setComponent')
+      ->with('field_name_test', array('test setting'))
+      ->will($this->returnSelf());
+    $entity->expects($this->once())
+      ->method('save')
+      ->with();
+    $plugin = new TestPerComponentEntityDisplay($entity);
+    $this->assertSame($plugin->import($row), array('entity_type_test', 'bundle_test', 'view_mode_test', 'field_name_test'));
+    $this->assertSame($plugin->getTestValues(), array('entity_type_test', 'bundle_test', 'view_mode_test'));
+  }
+
+}
+
+class TestPerComponentEntityDisplay extends ComponentEntityDisplayBase {
+  const MODE_NAME = 'view_mode';
+  protected $testValues;
+  public function __construct($entity) {
+    $this->entity = $entity;
+  }
+  protected function getEntity($entity_type, $bundle, $view_mode) {
+    $this->testValues = func_get_args();
+    return $this->entity;
+  }
+  public function getTestValues() {
+    return $this->testValues;
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/destination/PerComponentEntityFormDisplayTest.php

@@ -0,0 +1,67 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\migrate\Unit\destination\PerComponentEntityFormDisplayTest.
+ */
+
+namespace Drupal\Tests\migrate\Unit\destination;
+
+use Drupal\migrate\Plugin\migrate\destination\PerComponentEntityFormDisplay;
+use Drupal\migrate\Row;
+use Drupal\Tests\migrate\Unit\MigrateTestCase;
+
+/**
+ * Tests the entity display destination plugin.
+ *
+ * @group migrate
+ */
+class PerComponentEntityFormDisplayTest extends MigrateTestCase {
+
+  /**
+   * Tests the entity display import method.
+   */
+  public function testImport() {
+    $values = array(
+      'entity_type' => 'entity_type_test',
+      'bundle' => 'bundle_test',
+      'form_mode' => 'form_mode_test',
+      'field_name' => 'field_name_test',
+      'options' => array('test setting'),
+    );
+    $row = new Row();
+    foreach ($values as $key => $value) {
+      $row->setDestinationProperty($key, $value);
+    }
+    $entity = $this->getMockBuilder('Drupal\Core\Entity\Entity\EntityFormDisplay')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $entity->expects($this->once())
+      ->method('setComponent')
+      ->with('field_name_test', array('test setting'))
+      ->will($this->returnSelf());
+    $entity->expects($this->once())
+      ->method('save')
+      ->with();
+    $plugin = new TestPerComponentEntityFormDisplay($entity);
+    $this->assertSame($plugin->import($row), array('entity_type_test', 'bundle_test', 'form_mode_test', 'field_name_test'));
+    $this->assertSame($plugin->getTestValues(), array('entity_type_test', 'bundle_test', 'form_mode_test'));
+  }
+
+}
+
+class TestPerComponentEntityFormDisplay extends PerComponentEntityFormDisplay {
+  const MODE_NAME = 'form_mode';
+  protected $testValues;
+  public function __construct($entity) {
+    $this->entity = $entity;
+  }
+  protected function getEntity($entity_type, $bundle, $form_mode) {
+    $this->testValues = func_get_args();
+    return $this->entity;
+  }
+  public function getTestValues() {
+    return $this->testValues;
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/process/ArrayBuildTest.php

@@ -0,0 +1,82 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit\process;
+
+use Drupal\migrate\MigrateException;
+use Drupal\migrate\Plugin\migrate\process\ArrayBuild;
+
+/**
+ * @coversDefaultClass \Drupal\migrate\Plugin\migrate\process\ArrayBuild
+ * @group migrate
+ */
+class ArrayBuildTest extends MigrateProcessTestCase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    $configuration = [
+      'key' => 'foo',
+      'value' => 'bar',
+    ];
+    $this->plugin = new ArrayBuild($configuration, 'map', []);
+    parent::setUp();
+  }
+
+  /**
+   * Tests successful transformation.
+   */
+  public function testTransform() {
+    $source = [
+      ['foo' => 'Foo', 'bar' => 'Bar'],
+      ['foo' => 'foo bar', 'bar' => 'bar foo'],
+    ];
+    $expected = [
+      'Foo' => 'Bar',
+      'foo bar' => 'bar foo',
+    ];
+    $value = $this->plugin->transform($source, $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame($value, $expected);
+  }
+
+  /**
+   * Tests non-existent key for the key configuration.
+   */
+  public function testNonExistentKey() {
+    $source = [
+      ['bar' => 'foo'],
+    ];
+    $this->setExpectedException(MigrateException::class, "The key 'foo' does not exist");
+    $this->plugin->transform($source, $this->migrateExecutable, $this->row, 'destinationproperty');
+  }
+
+  /**
+   * Tests non-existent key for the value configuration.
+   */
+  public function testNonExistentValue() {
+    $source = [
+      ['foo' => 'bar'],
+    ];
+    $this->setExpectedException(MigrateException::class, "The key 'bar' does not exist");
+    $this->plugin->transform($source, $this->migrateExecutable, $this->row, 'destinationproperty');
+  }
+
+  /**
+   * Tests one-dimensional array input.
+   */
+  public function testOneDimensionalArrayInput() {
+    $source = ['foo' => 'bar'];
+    $this->setExpectedException(MigrateException::class, 'The input should be an array of arrays');
+    $this->plugin->transform($source, $this->migrateExecutable, $this->row, 'destinationproperty');
+  }
+
+  /**
+   * Tests string input.
+   */
+  public function testStringInput() {
+    $source = 'foo';
+    $this->setExpectedException(MigrateException::class, 'The input should be an array of arrays');
+    $this->plugin->transform($source, $this->migrateExecutable, $this->row, 'destinationproperty');
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/process/CallbackTest.php

@@ -0,0 +1,55 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\migrate\Unit\process\CallbackTest.
+ */
+
+namespace Drupal\Tests\migrate\Unit\process;
+
+use Drupal\migrate\Plugin\migrate\process\Callback;
+
+/**
+ * Tests the callback process plugin.
+ *
+ * @group migrate
+ */
+class CallbackTest extends MigrateProcessTestCase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    $this->plugin = new TestCallback();
+    parent::setUp();
+  }
+
+  /**
+   * Test callback with a function as callable.
+   */
+  public function testCallbackWithFunction() {
+    $this->plugin->setCallable('strtolower');
+    $value = $this->plugin->transform('FooBar', $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame($value, 'foobar');
+  }
+
+  /**
+   * Test callback with a class method as callable.
+   */
+  public function testCallbackWithClassMethod() {
+    $this->plugin->setCallable(array('\Drupal\Component\Utility\Unicode', 'strtolower'));
+    $value = $this->plugin->transform('FooBar', $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame($value, 'foobar');
+  }
+
+}
+
+class TestCallback extends Callback {
+  public function __construct() {
+  }
+
+  public function setCallable($callable) {
+    $this->configuration['callable'] = $callable;
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/process/ConcatTest.php

@@ -0,0 +1,69 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\migrate\Unit\process\ConcatTest.
+ */
+
+namespace Drupal\Tests\migrate\Unit\process;
+
+use Drupal\migrate\Plugin\migrate\process\Concat;
+
+/**
+ * Tests the concat process plugin.
+ *
+ * @group migrate
+ */
+class ConcatTest extends MigrateProcessTestCase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    $this->plugin = new TestConcat();
+    parent::setUp();
+  }
+
+  /**
+   * Test concat works without a delimiter.
+   */
+  public function testConcatWithoutDelimiter() {
+    $value = $this->plugin->transform(array('foo', 'bar'), $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame($value, 'foobar');
+  }
+
+  /**
+   * Test concat fails properly on non-arrays.
+   *
+   * @expectedException \Drupal\migrate\MigrateException
+   */
+  public function testConcatWithNonArray() {
+    $this->plugin->transform('foo', $this->migrateExecutable, $this->row, 'destinationproperty');
+  }
+
+  /**
+   * Test concat works without a delimiter.
+   */
+  public function testConcatWithDelimiter() {
+    $this->plugin->setDelimiter('_');
+    $value = $this->plugin->transform(array('foo', 'bar'), $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame($value, 'foo_bar');
+  }
+
+}
+
+class TestConcat extends Concat {
+  public function __construct() {
+  }
+
+  /**
+   * Set the delimiter.
+   *
+   * @param string $delimiter
+   *   The new delimiter.
+   */
+  public function setDelimiter($delimiter) {
+    $this->configuration['delimiter'] = $delimiter;
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/process/DedupeEntityTest.php

@@ -0,0 +1,208 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit\process;
+
+use Drupal\Core\Entity\Query\QueryInterface;
+use Drupal\migrate\Plugin\migrate\process\DedupeEntity;
+use Drupal\Component\Utility\Unicode;
+
+/**
+ * @coversDefaultClass \Drupal\migrate\Plugin\migrate\process\DedupeEntity
+ * @group migrate
+ */
+class DedupeEntityTest extends MigrateProcessTestCase {
+
+  /**
+   * The mock entity query.
+   *
+   * @var \Drupal\Core\Entity\Query\QueryInterface
+   * @var \Drupal\Core\Entity\Query\QueryFactory
+   */
+  protected $entityQuery;
+
+  /**
+   * The mock entity query factory.
+   *
+   * @var \Drupal\Core\Entity\Query\QueryFactory|\PHPUnit_Framework_MockObject_MockObject
+   */
+  protected $entityQueryFactory;
+
+  /**
+   * The migration configuration, initialized to set the ID to test.
+   *
+   * @var array
+   */
+  protected $migrationConfiguration = array(
+    'id' => 'test',
+  );
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    $this->entityQuery = $this->getMockBuilder('Drupal\Core\Entity\Query\QueryInterface')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $this->entityQueryFactory = $this->getMockBuilder('Drupal\Core\Entity\Query\QueryFactory')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $this->entityQueryFactory->expects($this->any())
+      ->method('get')
+      ->will($this->returnValue($this->entityQuery));
+    parent::setUp();
+  }
+
+  /**
+   * Tests entity based deduplication based on providerTestDedupe() values.
+   *
+   * @dataProvider providerTestDedupe
+   */
+  public function testDedupe($count, $postfix = '', $start = NULL, $length = NULL) {
+    $configuration = array(
+      'entity_type' => 'test_entity_type',
+      'field' => 'test_field',
+    );
+    if ($postfix) {
+      $configuration['postfix'] = $postfix;
+    }
+    $configuration['start'] = isset($start) ? $start : NULL;
+    $configuration['length'] = isset($length) ? $length : NULL;
+    $plugin = new DedupeEntity($configuration, 'dedupe_entity', array(), $this->getMigration(), $this->entityQueryFactory);
+    $this->entityQueryExpects($count);
+    $value = $this->randomMachineName(32);
+    $actual = $plugin->transform($value, $this->migrateExecutable, $this->row, 'testproperty');
+    $expected = Unicode::substr($value, $start, $length);
+    $expected .= $count ? $postfix . $count : '';
+    $this->assertSame($expected, $actual);
+  }
+
+  /**
+   * Tests that invalid start position throws an exception.
+   */
+  public function testDedupeEntityInvalidStart() {
+    $configuration = array(
+      'entity_type' => 'test_entity_type',
+      'field' => 'test_field',
+      'start' => 'foobar',
+    );
+    $plugin = new DedupeEntity($configuration, 'dedupe_entity', array(), $this->getMigration(), $this->entityQueryFactory);
+    $this->setExpectedException('Drupal\migrate\MigrateException', 'The start position configuration key should be an integer. Omit this key to capture from the beginning of the string.');
+    $plugin->transform('test_start', $this->migrateExecutable, $this->row, 'testproperty');
+  }
+
+  /**
+   * Tests that invalid length option throws an exception.
+   */
+  public function testDedupeEntityInvalidLength() {
+    $configuration = array(
+      'entity_type' => 'test_entity_type',
+      'field' => 'test_field',
+      'length' => 'foobar',
+    );
+    $plugin = new DedupeEntity($configuration, 'dedupe_entity', array(), $this->getMigration(), $this->entityQueryFactory);
+    $this->setExpectedException('Drupal\migrate\MigrateException', 'The character length configuration key should be an integer. Omit this key to capture the entire string.');
+    $plugin->transform('test_length', $this->migrateExecutable, $this->row, 'testproperty');
+  }
+
+  /**
+   * Data provider for testDedupe().
+   */
+  public function providerTestDedupe() {
+    return array(
+      // Tests no duplication.
+      array(0),
+      // Tests no duplication and start position.
+      array(0, NULL, 10),
+      // Tests no duplication, start position, and length.
+      array(0, NULL, 5, 10),
+      // Tests no duplication and length.
+      array(0, NULL, NULL, 10),
+      // Tests duplication.
+      array(3),
+      // Tests duplication and start position.
+      array(3, NULL, 10),
+      // Tests duplication, start position, and length.
+      array(3, NULL, 5, 10),
+      // Tests duplication and length.
+      array(3, NULL, NULL, 10),
+      // Tests no duplication and postfix.
+      array(0, '_'),
+      // Tests no duplication, postfix, and start position.
+      array(0, '_', 5),
+      // Tests no duplication, postfix, start position, and length.
+      array(0, '_', 5, 10),
+      // Tests no duplication, postfix, and length.
+      array(0, '_', NULL, 10),
+      // Tests duplication and postfix.
+      array(2, '_'),
+      // Tests duplication, postfix, and start position.
+      array(2, '_', 5),
+      // Tests duplication, postfix, start position, and length.
+      array(2, '_', 5, 10),
+      // Tests duplication, postfix, and length.
+      array(2, '_', NULL, 10),
+    );
+  }
+
+  /**
+   * Helper function to add expectations to the mock entity query object.
+   *
+   * @param int $count
+   *   The number of deduplications to be set up.
+   */
+  protected function entityQueryExpects($count) {
+    $this->entityQuery->expects($this->exactly($count + 1))
+      ->method('condition')
+      ->will($this->returnValue($this->entityQuery));
+    $this->entityQuery->expects($this->exactly($count + 1))
+      ->method('count')
+      ->will($this->returnValue($this->entityQuery));
+    $this->entityQuery->expects($this->exactly($count + 1))
+      ->method('execute')
+      ->will($this->returnCallback(function () use (&$count) { return $count--;}));
+  }
+
+  /**
+   * Test deduplicating only migrated entities.
+   */
+  public function testDedupeMigrated() {
+    $configuration = array(
+      'entity_type' => 'test_entity_type',
+      'field' => 'test_field',
+      'migrated' => TRUE,
+    );
+    $plugin = new DedupeEntity($configuration, 'dedupe_entity', array(), $this->getMigration(), $this->entityQueryFactory);
+
+    // Setup the entityQuery used in DedupeEntity::exists. The map, $map, is
+    // an array consisting of the four input parameters to the query condition
+    // method and then the query to return. Both 'forum' and
+    // 'test_vocab' are existing entities. There is no 'test_vocab1'.
+    $map = [];
+    foreach (['forums', 'test_vocab', 'test_vocab1'] as $id) {
+      $query = $this->prophesize(QueryInterface::class);
+      $query->willBeConstructedWith([]);
+      $query->execute()->willReturn($id === 'test_vocab1' ? [] : [$id]);
+      $map[] = ['test_field', $id, NULL, NULL, $query->reveal()];
+    }
+    $this->entityQuery
+      ->method('condition')
+      ->will($this->returnValueMap($map));
+
+    // Entity 'forums' is pre-existing, entity 'test_vocab' was migrated.
+    $this->idMap
+      ->method('lookupSourceID')
+      ->will($this->returnValueMap([
+        [['test_field' => 'forums'], FALSE],
+        [['test_field' => 'test_vocab'], ['source_id' => 42]],
+      ]));
+
+    // Existing entity 'forums' was not migrated, it should not be deduplicated.
+    $actual = $plugin->transform('forums', $this->migrateExecutable, $this->row, 'testproperty');
+    $this->assertEquals('forums', $actual, 'Pre-existing name is re-used');
+
+    // Entity 'test_vocab' was migrated, should be deduplicated.
+    $actual = $plugin->transform('test_vocab', $this->migrateExecutable, $this->row, 'testproperty');
+    $this->assertEquals('test_vocab1', $actual, 'Migrated name is deduplicated');
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/process/ExplodeTest.php

@@ -0,0 +1,77 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit\process;
+
+use Drupal\migrate\Plugin\migrate\process\Explode;
+use Drupal\migrate\Plugin\migrate\process\Concat;
+
+/**
+ * Tests the Explode process plugin.
+ *
+ * @group migrate
+ */
+class ExplodeTest extends MigrateProcessTestCase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    $configuration = [
+      'delimiter' => ',',
+    ];
+    $this->plugin = new Explode($configuration, 'map', []);
+    parent::setUp();
+  }
+
+  /**
+   * Test explode transform process works.
+   */
+  public function testTransform() {
+    $value = $this->plugin->transform('foo,bar,tik', $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame($value, ['foo', 'bar', 'tik']);
+  }
+
+  /**
+   * Test explode transform process works with a limit.
+   */
+  public function testTransformLimit() {
+    $plugin = new Explode(['delimiter' => '_', 'limit' => 2], 'map', []);
+    $value = $plugin->transform('foo_bar_tik', $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame($value, ['foo', 'bar_tik']);
+  }
+
+  /**
+   * Test if the explode process can be chained with a handles_multiple process.
+   */
+  public function testChainedTransform() {
+    $exploded = $this->plugin->transform('foo,bar,tik', $this->migrateExecutable, $this->row, 'destinationproperty');
+
+    $concat = new Concat([], 'map', []);
+    $concatenated = $concat->transform($exploded, $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame($concatenated, 'foobartik');
+  }
+
+  /**
+   * Test explode fails properly on non-strings.
+   *
+   * @expectedException \Drupal\migrate\MigrateException
+   *
+   * @expectedExceptionMessage is not a string
+   */
+  public function testExplodeWithNonString() {
+    $this->plugin->transform(['foo'], $this->migrateExecutable, $this->row, 'destinationproperty');
+  }
+
+  /**
+   * Test explode fails with empty delimiter.
+   *
+   * @expectedException \Drupal\migrate\MigrateException
+   *
+   * @expectedExceptionMessage delimiter is empty
+   */
+  public function testExplodeWithEmptyDelimiter() {
+    $plugin = new Explode(['delimiter' => ''], 'map', []);
+    $plugin->transform('foo,bar', $this->migrateExecutable, $this->row, 'destinationproperty');
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/process/ExtractTest.php

@@ -0,0 +1,59 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit\process;
+
+use Drupal\migrate\Plugin\migrate\process\Extract;
+
+/**
+ * @coversDefaultClass \Drupal\migrate\Plugin\migrate\process\Extract
+ * @group migrate
+ */
+class ExtractTest extends MigrateProcessTestCase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    $configuration['index'] = array('foo');
+    $this->plugin = new Extract($configuration, 'map', array());
+    parent::setUp();
+  }
+
+  /**
+   * Tests successful extraction.
+   */
+  public function testExtract() {
+    $value = $this->plugin->transform(array('foo' => 'bar'), $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame($value, 'bar');
+  }
+
+  /**
+   * Tests invalid input.
+   *
+   * @expectedException \Drupal\migrate\MigrateException
+   * @expectedExceptionMessage Input should be an array.
+   */
+  public function testExtractFromString() {
+    $this->plugin->transform('bar', $this->migrateExecutable, $this->row, 'destinationproperty');
+  }
+
+  /**
+   * Tests unsuccessful extraction.
+   *
+   * @expectedException \Drupal\migrate\MigrateException
+   * @expectedExceptionMessage Array index missing, extraction failed.
+   */
+  public function testExtractFail() {
+    $this->plugin->transform(array('bar' => 'foo'), $this->migrateExecutable, $this->row, 'destinationproperty');
+  }
+
+  /**
+   * Tests unsuccessful extraction.
+   */
+  public function testExtractFailDefault() {
+    $plugin = new Extract(['index' => ['foo'], 'default' => 'test'], 'map', []);
+    $value = $plugin->transform(['bar' => 'foo'], $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame($value, 'test', '');
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/process/FlattenTest.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit\process;
+use Drupal\migrate\Plugin\migrate\process\Flatten;
+
+
+/**
+ * Tests the flatten plugin.
+ *
+ * @group migrate
+ */
+class FlattenTest extends MigrateProcessTestCase {
+
+  /**
+   * Test that various array flatten operations work properly.
+   */
+  public function testFlatten() {
+    $plugin = new Flatten(array(), 'flatten', array());
+    $flattened = $plugin->transform(array(1, 2, array(3, 4, array(5)), array(), array(7, 8)), $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame($flattened, array(1, 2, 3, 4, 5, 7, 8));
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/process/GetTest.php

@@ -0,0 +1,119 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\migrate\Unit\process\GetTest.
+ */
+
+namespace Drupal\Tests\migrate\Unit\process;
+
+use Drupal\migrate\Plugin\migrate\process\TestGet;
+
+/**
+ * Tests the get process plugin.
+ *
+ * @group migrate
+ */
+class GetTest extends MigrateProcessTestCase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    $this->plugin = new TestGet();
+    parent::setUp();
+  }
+
+  /**
+   * Tests the Get plugin when source is a string.
+   */
+  public function testTransformSourceString() {
+    $this->row->expects($this->once())
+      ->method('getSourceProperty')
+      ->with('test')
+      ->will($this->returnValue('source_value'));
+    $this->plugin->setSource('test');
+    $value = $this->plugin->transform(NULL, $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame($value, 'source_value');
+  }
+
+  /**
+   * Tests the Get plugin when source is an array.
+   */
+  public function testTransformSourceArray() {
+    $map = array(
+      'test1' => 'source_value1',
+      'test2' => 'source_value2',
+    );
+    $this->plugin->setSource(array('test1', 'test2'));
+    $this->row->expects($this->exactly(2))
+      ->method('getSourceProperty')
+      ->will($this->returnCallback(function ($argument)  use ($map) { return $map[$argument]; } ));
+    $value = $this->plugin->transform(NULL, $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame($value, array('source_value1', 'source_value2'));
+  }
+
+  /**
+   * Tests the Get plugin when source is a string pointing to destination.
+   */
+  public function testTransformSourceStringAt() {
+    $this->row->expects($this->once())
+      ->method('getSourceProperty')
+      ->with('@test')
+      ->will($this->returnValue('source_value'));
+    $this->plugin->setSource('@@test');
+    $value = $this->plugin->transform(NULL, $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame($value, 'source_value');
+  }
+
+  /**
+   * Tests the Get plugin when source is an array pointing to destination.
+   */
+  public function testTransformSourceArrayAt() {
+    $map = array(
+      'test1' => 'source_value1',
+      '@test2' => 'source_value2',
+      '@test3' => 'source_value3',
+      'test4' => 'source_value4',
+    );
+    $this->plugin->setSource(array('test1', '@@test2', '@@test3', 'test4'));
+    $this->row->expects($this->exactly(4))
+      ->method('getSourceProperty')
+      ->will($this->returnCallback(function ($argument)  use ($map) { return $map[$argument]; } ));
+    $value = $this->plugin->transform(NULL, $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame($value, array('source_value1', 'source_value2', 'source_value3', 'source_value4'));
+  }
+
+  /**
+   * Tests the Get plugin when source has integer values.
+   */
+  public function testIntegerValues() {
+    $this->row->expects($this->exactly(2))
+      ->method('getSourceProperty')
+      ->willReturnOnConsecutiveCalls('val1', 'val2');
+
+    $this->plugin->setSource([0 => 0, 1 => 'test']);
+    $return = $this->plugin->transform(NULL, $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame([0 => 'val1', 1 => 'val2'], $return);
+
+    $this->plugin->setSource([FALSE]);
+    $return = $this->plugin->transform(NULL, $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame([NULL], $return);
+
+    $this->plugin->setSource([NULL]);
+    $return = $this->plugin->transform(NULL, $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame([NULL], $return);
+  }
+
+}
+
+namespace Drupal\migrate\Plugin\migrate\process;
+
+class TestGet extends Get {
+  public function __construct() {
+  }
+  public function setSource($source) {
+    $this->configuration['source'] = $source;
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/process/IteratorTest.php

@@ -0,0 +1,82 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit\process;
+
+use Drupal\migrate\MigrateExecutable;
+use Drupal\migrate\Plugin\migrate\process\Get;
+use Drupal\migrate\Plugin\migrate\process\Iterator;
+use Drupal\migrate\Row;
+use Drupal\Tests\migrate\Unit\MigrateTestCase;
+
+/**
+ * Tests the iterator process plugin.
+ *
+ * @group migrate
+ */
+class IteratorTest extends MigrateTestCase {
+
+  /**
+   * The iterator plugin being tested.
+   *
+   * @var \Drupal\migrate\Plugin\migrate\process\TestIterator
+   */
+  protected $plugin;
+
+  /**
+   * @var array
+   */
+  protected $migrationConfiguration = array(
+    'id' => 'test',
+  );
+
+  /**
+   * Tests the iterator process plugin.
+   */
+  public function testIterator() {
+    $migration = $this->getMigration();
+    // Set up the properties for the iterator.
+    $configuration = array(
+      'process' => array(
+        'foo' => 'source_foo',
+        'id' => 'source_id',
+      ),
+      'key' => '@id',
+    );
+    $plugin = new Iterator($configuration, 'iterator', array());
+    // Manually create the plugins. Migration::getProcessPlugins does this
+    // normally but the plugin system is not available.
+    foreach ($configuration['process'] as $destination => $source) {
+      $iterator_plugins[$destination][] = new Get(array('source' => $source), 'get', array());
+    }
+    $migration->expects($this->at(1))
+      ->method('getProcessPlugins')
+      ->will($this->returnValue($iterator_plugins));
+    // Set up the key plugins.
+    $key_plugin['key'][] = new Get(array('source' => '@id'), 'get', array());
+    $migration->expects($this->at(2))
+      ->method('getProcessPlugins')
+      ->will($this->returnValue($key_plugin));
+    $event_dispatcher = $this->getMock('Symfony\Component\EventDispatcher\EventDispatcherInterface');
+    $migrate_executable = new MigrateExecutable($migration, $this->getMock('Drupal\migrate\MigrateMessageInterface'), $event_dispatcher);
+
+    // The current value of the pipeline.
+    $current_value = array(
+      array(
+        'source_foo' => 'test',
+        'source_id' => 42,
+      ),
+    );
+    // This is not used but the interface requires it, so create an empty row.
+    $row = new Row();
+
+    // After transformation, check to make sure that source_foo and source_id's
+    // values ended up in the proper destinations, and that the value of the
+    // key (@id) is the same as the destination ID (42).
+    $new_value = $plugin->transform($current_value, $migrate_executable, $row, 'test');
+    $this->assertSame(count($new_value), 1);
+    $this->assertSame(count($new_value[42]), 2);
+    $this->assertSame($new_value[42]['foo'], 'test');
+    $this->assertSame($new_value[42]['id'], 42);
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/process/MachineNameTest.php

@@ -0,0 +1,61 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit\process;
+
+use Drupal\migrate\Plugin\migrate\process\MachineName;
+
+/**
+ * Tests the machine name process plugin.
+ *
+ * @group migrate
+ */
+class MachineNameTest extends MigrateProcessTestCase {
+
+  /**
+   * The mock transliteration.
+   *
+   * @var \Drupal\Component\Transliteration\TransliterationInterface
+   */
+  protected $transliteration;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    $this->transliteration = $this->getMockBuilder('Drupal\Component\Transliteration\TransliterationInterface')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $this->row = $this->getMockBuilder('Drupal\migrate\Row')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $this->migrateExecutable = $this->getMockBuilder('Drupal\migrate\MigrateExecutable')
+      ->disableOriginalConstructor()
+      ->getMock();
+    parent::setUp();
+  }
+
+  /**
+   * Tests machine name transformation of non-alphanumeric characters.
+   */
+  public function testMachineNames() {
+
+    // Tests the following transformations:
+    // - non-alphanumeric character (including spaces) -> underscore,
+    // - Uppercase -> lowercase,
+    // - Multiple consecutive underscore -> single underscore.
+    $human_name_ascii = 'foo2, the.bar;2*&the%baz!YEE____HaW ';
+    $human_name = $human_name_ascii . 'áéő';
+    $expected_result = 'foo2_the_bar_2_the_baz_yee_haw_aeo';
+    // Test for calling transliterate on mock object.
+    $this->transliteration
+      ->expects($this->once())
+      ->method('transliterate')
+      ->with($human_name)
+      ->will($this->returnValue($human_name_ascii . 'aeo'));
+
+    $plugin = new MachineName(array(), 'machine_name', array(), $this->transliteration);
+    $value = $plugin->transform($human_name, $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertEquals($expected_result, $value);
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/process/MigrateProcessTestCase.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit\process;
+
+use Drupal\Tests\migrate\Unit\MigrateTestCase;
+
+abstract class MigrateProcessTestCase extends MigrateTestCase {
+
+  /**
+   * @var \Drupal\migrate\Plugin\MigrateProcessInterface
+   */
+  protected $plugin;
+
+  /**
+   * @var \Drupal\migrate\Row
+   */
+  protected $row;
+
+  /**
+   * @var \Drupal\migrate\MigrateExecutable|\PHPUnit_Framework_MockObject_MockObject
+   */
+  protected $migrateExecutable;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    $this->row = $this->getMockBuilder('Drupal\migrate\Row')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $this->migrateExecutable = $this->getMockBuilder('Drupal\migrate\MigrateExecutable')
+      ->disableOriginalConstructor()
+      ->getMock();
+
+    parent::setUp();
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/process/MigrationTest.php

@@ -0,0 +1,202 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit\process;
+
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate\Plugin\migrate\process\Migration;
+use Drupal\migrate\Plugin\MigrateDestinationInterface;
+use Drupal\migrate\Plugin\MigrateIdMapInterface;
+use Drupal\migrate\Plugin\MigratePluginManager;
+use Drupal\migrate\Plugin\MigrateSourceInterface;
+use Drupal\migrate\Plugin\MigrationPluginManagerInterface;
+use Prophecy\Argument;
+
+/**
+ * @coversDefaultClass \Drupal\migrate\Plugin\migrate\process\Migration
+ * @group migrate
+ */
+class MigrationTest extends MigrateProcessTestCase {
+
+  /**
+   * @covers ::transform
+   */
+  public function testTransformWithStubSkipping() {
+    $migration_plugin = $this->prophesize(MigrationInterface::class);
+    $migration_plugin_manager = $this->prophesize(MigrationPluginManagerInterface::class);
+    $process_plugin_manager = $this->prophesize(MigratePluginManager::class);
+
+    $destination_id_map = $this->prophesize(MigrateIdMapInterface::class);
+    $destination_migration = $this->prophesize(MigrationInterface::class);
+    $destination_migration->getIdMap()->willReturn($destination_id_map->reveal());
+    $destination_id_map->lookupDestinationId([1])->willReturn(NULL);
+
+    // Ensure the migration plugin manager returns our migration.
+    $migration_plugin_manager->createInstances(Argument::exact(['destination_migration']))
+      ->willReturn(['destination_migration' => $destination_migration->reveal()]);
+
+    $configuration = [
+      'no_stub' => TRUE,
+      'migration' => 'destination_migration',
+    ];
+
+    $migration_plugin->id()->willReturn('actual_migration');
+    $destination_migration->getDestinationPlugin(TRUE)->shouldNotBeCalled();
+
+    $migration = new Migration($configuration, '', [], $migration_plugin->reveal(), $migration_plugin_manager->reveal(), $process_plugin_manager->reveal());
+    $result = $migration->transform(1, $this->migrateExecutable, $this->row, '');
+    $this->assertNull($result);
+  }
+
+  /**
+   * @covers ::transform
+   */
+  public function testTransformWithStubbing() {
+    $migration_plugin = $this->prophesize(MigrationInterface::class);
+    $migration_plugin_manager = $this->prophesize(MigrationPluginManagerInterface::class);
+    $process_plugin_manager = $this->prophesize(MigratePluginManager::class);
+
+    $destination_id_map = $this->prophesize(MigrateIdMapInterface::class);
+    $destination_migration = $this->prophesize('Drupal\migrate\Plugin\Migration');
+    $destination_migration->getIdMap()->willReturn($destination_id_map->reveal());
+    $migration_plugin_manager->createInstances(['destination_migration'])
+      ->willReturn(['destination_migration' => $destination_migration->reveal()]);
+    $destination_id_map->lookupDestinationId([1])->willReturn(NULL);
+    $destination_id_map->saveIdMapping(Argument::any(), Argument::any(), MigrateIdMapInterface::STATUS_NEEDS_UPDATE)->willReturn(NULL);
+
+    $configuration = [
+      'no_stub' => FALSE,
+      'migration' => 'destination_migration',
+    ];
+
+    $migration_plugin->id()->willReturn('actual_migration');
+    $destination_migration->id()->willReturn('destination_migration');
+    $destination_migration->getDestinationPlugin(TRUE)->shouldBeCalled();
+    $destination_migration->getProcess()->willReturn([]);
+    $destination_migration->getSourceConfiguration()->willReturn([]);
+
+    $source_plugin = $this->prophesize(MigrateSourceInterface::class);
+    $source_plugin->getIds()->willReturn(['nid']);
+    $destination_migration->getSourcePlugin()->willReturn($source_plugin->reveal());
+    $destination_plugin = $this->prophesize(MigrateDestinationInterface::class);
+    $destination_plugin->import(Argument::any())->willReturn([2]);
+    $destination_migration->getDestinationPlugin(TRUE)->willReturn($destination_plugin->reveal());
+
+    $migration = new Migration($configuration, '', [], $migration_plugin->reveal(), $migration_plugin_manager->reveal(), $process_plugin_manager->reveal());
+    $result = $migration->transform(1, $this->migrateExecutable, $this->row, '');
+    $this->assertEquals(2, $result);
+  }
+
+  /**
+   * Tests that processing is skipped when the input value is empty.
+   *
+   * @expectedException \Drupal\migrate\MigrateSkipProcessException
+   */
+  public function testSkipOnEmpty() {
+    $migration_plugin = $this->prophesize(MigrationInterface::class);
+    $migration_plugin_manager = $this->prophesize(MigrationPluginManagerInterface::class);
+    $process_plugin_manager = $this->prophesize(MigratePluginManager::class);
+
+    $configuration = [
+      'migration' => 'foobaz',
+    ];
+    $migration_plugin->id()->willReturn(uniqid());
+    $migration = new Migration($configuration, 'migration', [], $migration_plugin->reveal(), $migration_plugin_manager->reveal(), $process_plugin_manager->reveal());
+    $migration->transform(0, $this->migrateExecutable, $this->row, 'foo');
+  }
+
+  /**
+   * Tests a successful lookup.
+   *
+   * @dataProvider successfulLookupDataProvider
+   *
+   * @param array $source_id_values
+   *   The source id(s) of the migration map.
+   * @param array $destination_id_values
+   *   The destination id(s) of the migration map.
+   * @param string|array $source_value
+   *   The source value(s) for the migration process plugin.
+   * @param string|array $expected_value
+   *   The expected value(s) of the migration process plugin.
+   */
+  public function testSuccessfulLookup($source_id_values, $destination_id_values, $source_value, $expected_value) {
+    $migration_plugin = $this->prophesize(MigrationInterface::class);
+    $migration_plugin_manager = $this->prophesize(MigrationPluginManagerInterface::class);
+    $process_plugin_manager = $this->prophesize(MigratePluginManager::class);
+
+    $configuration = [
+      'migration' => 'foobaz',
+    ];
+    $migration_plugin->id()->willReturn(uniqid());
+
+    $id_map = $this->prophesize(MigrateIdMapInterface::class);
+    $id_map->lookupDestinationId($source_id_values)->willReturn($destination_id_values);
+    $migration_plugin->getIdMap()->willReturn($id_map->reveal());
+
+    $migration_plugin_manager->createInstances(['foobaz'])
+      ->willReturn(['foobaz' => $migration_plugin->reveal()]);
+
+    $migrationStorage = $this->prophesize(EntityStorageInterface::class);
+    $migrationStorage
+      ->loadMultiple(['foobaz'])
+      ->willReturn([$migration_plugin->reveal()]);
+
+    $migration = new Migration($configuration, 'migration', [], $migration_plugin->reveal(), $migration_plugin_manager->reveal(), $process_plugin_manager->reveal());
+    $this->assertSame($expected_value, $migration->transform($source_value, $this->migrateExecutable, $this->row, 'foo'));
+  }
+
+  /**
+   * Provides data for the successful lookup test.
+   *
+   * @return array
+   */
+  public function successfulLookupDataProvider() {
+    return [
+      // Test data for scalar to scalar.
+      [
+        // Source ID of the migration map.
+        [1],
+        // Destination ID of the migration map.
+        [3],
+        // Input value for the migration plugin.
+        1,
+        // Expected output value of the migration plugin.
+        3,
+      ],
+      // Test data for scalar to array.
+      [
+        // Source ID of the migration map.
+        [1],
+        // Destination IDs of the migration map.
+        [3, 'foo'],
+        // Input value for the migration plugin.
+        1,
+        // Expected output values of the migration plugin.
+        [3, 'foo'],
+      ],
+      // Test data for array to scalar.
+      [
+        // Source IDs of the migration map.
+        [1, 3],
+        // Destination ID of the migration map.
+        ['foo'],
+        // Input values for the migration plugin.
+        [1, 3],
+        // Expected output value of the migration plugin.
+        'foo',
+      ],
+      // Test data for array to array.
+      [
+        // Source IDs of the migration map.
+        [1, 3],
+        // Destination IDs of the migration map.
+        [3, 'foo'],
+        // Input values for the migration plugin.
+        [1, 3],
+        // Expected output values of the migration plugin.
+        [3, 'foo'],
+      ],
+    ];
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/process/SkipOnEmptyTest.php

@@ -0,0 +1,54 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit\process;
+use Drupal\migrate\Plugin\migrate\process\SkipOnEmpty;
+
+/**
+ * Tests the skip on empty process plugin.
+ *
+ * @group migrate
+ * @coversDefaultClass \Drupal\migrate\Plugin\migrate\process\SkipOnEmpty
+ */
+class SkipOnEmptyTest extends MigrateProcessTestCase {
+
+  /**
+   * @covers ::process
+   * @expectedException \Drupal\migrate\MigrateSkipProcessException
+   */
+  public function testProcessSkipsOnEmpty() {
+    $configuration['method'] = 'process';
+    (new SkipOnEmpty($configuration, 'skip_on_empty', []))
+      ->transform('', $this->migrateExecutable, $this->row, 'destinationproperty');
+  }
+
+  /**
+   * @covers ::process
+   */
+  public function testProcessBypassesOnNonEmpty() {
+    $configuration['method'] = 'process';
+    $value = (new SkipOnEmpty($configuration, 'skip_on_empty', []))
+      ->transform(' ', $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame($value, ' ');
+  }
+
+  /**
+   * @covers ::row
+   * @expectedException \Drupal\migrate\MigrateSkipRowException
+   */
+  public function testRowSkipsOnEmpty() {
+    $configuration['method'] = 'row';
+    (new SkipOnEmpty($configuration, 'skip_on_empty', []))
+      ->transform('', $this->migrateExecutable, $this->row, 'destinationproperty');
+  }
+
+  /**
+   * @covers ::row
+   */
+  public function testRowBypassesOnNonEmpty() {
+    $configuration['method'] = 'row';
+    $value = (new SkipOnEmpty($configuration, 'skip_on_empty', []))
+      ->transform(' ', $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame($value, ' ');
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/process/StaticMapTest.php

@@ -0,0 +1,93 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit\process;
+
+use Drupal\migrate\Plugin\migrate\process\StaticMap;
+
+/**
+ * Tests the static map process plugin.
+ *
+ * @group migrate
+ */
+class StaticMapTest extends MigrateProcessTestCase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    $configuration['map']['foo']['bar'] = 'baz';
+    $this->plugin = new StaticMap($configuration, 'map', array());
+    parent::setUp();
+  }
+
+  /**
+   * Tests map when the source is a string.
+   */
+  public function testMapWithSourceString() {
+    $value = $this->plugin->transform('foo', $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame($value, array('bar' => 'baz'));
+  }
+
+  /**
+   * Tests map when the source is a list.
+   */
+  public function testMapWithSourceList() {
+    $value = $this->plugin->transform(array('foo', 'bar'), $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame($value, 'baz');
+  }
+
+  /**
+   * Tests when the source is empty.
+   *
+   * @expectedException \Drupal\migrate\MigrateException
+   */
+  public function testMapwithEmptySource() {
+    $this->plugin->transform(array(), $this->migrateExecutable, $this->row, 'destinationproperty');
+  }
+
+  /**
+   * Tests when the source is invalid.
+   *
+   * @expectedException \Drupal\migrate\MigrateSkipRowException
+   */
+  public function testMapwithInvalidSource() {
+    $this->plugin->transform(array('bar'), $this->migrateExecutable, $this->row, 'destinationproperty');
+  }
+
+  /**
+   * Tests when the source is invalid but there's a default.
+   */
+  public function testMapWithInvalidSourceWithADefaultValue() {
+    $configuration['map']['foo']['bar'] = 'baz';
+    $configuration['default_value'] = 'test';
+    $this->plugin = new StaticMap($configuration, 'map', array());
+    $value = $this->plugin->transform(array('bar'), $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame($value, 'test');
+  }
+
+  /**
+   * Tests when the source is invalid but there's a default value of NULL.
+   */
+  public function testMapWithInvalidSourceWithANullDefaultValue() {
+    $configuration['map']['foo']['bar'] = 'baz';
+    $configuration['default_value'] = NULL;
+    $this->plugin = new StaticMap($configuration, 'map', []);
+    $value = $this->plugin->transform(array('bar'), $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertNull($value);
+  }
+
+  /**
+   * Tests when the source is invalid and bypass is enabled.
+   *
+   * @expectedException \Drupal\migrate\MigrateException
+   * @expectedExceptionMessage Setting both default_value and bypass is invalid.
+   */
+  public function testMapWithInvalidSourceAndBypass() {
+    $configuration['map']['foo']['bar'] = 'baz';
+    $configuration['default_value'] = 'test';
+    $configuration['bypass'] = TRUE;
+    $this->plugin = new StaticMap($configuration, 'map', array());
+    $this->plugin->transform(array('bar'), $this->migrateExecutable, $this->row, 'destinationproperty');
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/process/SubstrTest.php

@@ -0,0 +1,92 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit\process;
+
+use Drupal\migrate\Plugin\migrate\process\Substr;
+
+/**
+ * Tests the substr plugin.
+ *
+ * @coversDefaultClass \Drupal\migrate\Plugin\migrate\process\Substr
+ *
+ * @group migrate
+ */
+class SubstrTest extends MigrateProcessTestCase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+  }
+
+  /**
+   * Tests Substr plugin based on providerTestSubstr() values.
+   *
+   * @dataProvider providerTestSubstr
+   */
+  public function testSubstr($start = NULL, $length = NULL, $expected = NULL) {
+    $configuration['start'] = $start;
+    $configuration['length'] = $length;
+    $this->plugin = new Substr($configuration, 'map', []);
+    $value = $this->plugin->transform('Captain Janeway', $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame($expected, $value);
+  }
+
+  /**
+   * Data provider for testSubstr().
+   */
+  public function providerTestSubstr() {
+    return [
+      // Tests with valid start and length values.
+      [0, 7, 'Captain'],
+      // Tests with valid start > 0 and valid length.
+      [6, 3, 'n J'],
+      // Tests with valid start < 0 and valid length.
+      [-7, 4, 'Jane'],
+      // Tests without start value and valid length value.
+      [NULL, 7, 'Captain'],
+      // Tests with valid start value and no length value.
+      [1, NULL, 'aptain Janeway'],
+      // Tests without both start and length values.
+      [NULL, NULL, 'Captain Janeway'],
+    ];
+  }
+
+  /**
+   * Tests invalid input type.
+   *
+   * @expectedException \Drupal\migrate\MigrateException
+   * @expectedExceptionMessage The input value must be a string.
+   */
+  public function testSubstrFail() {
+    $configuration = [];
+    $this->plugin = new Substr($configuration, 'map', []);
+    $this->plugin->transform(['Captain Janeway'], $this->migrateExecutable, $this->row, 'destinationproperty');
+  }
+
+  /**
+   * Tests that the start parameter is an integer.
+   *
+   * @expectedException \Drupal\migrate\MigrateException
+   * @expectedExceptionMessage The start position configuration value should be an integer. Omit this key to capture from the beginning of the string.
+   */
+  public function testStartIsString() {
+    $configuration['start'] = '2';
+    $this->plugin = new Substr($configuration, 'map', []);
+    $this->plugin->transform(['foo'], $this->migrateExecutable, $this->row, 'destinationproperty');
+  }
+
+  /**
+   * Tests that the length parameter is an integer.
+   *
+   * @expectedException \Drupal\migrate\MigrateException
+   * @expectedExceptionMessage The character length configuration value should be an integer. Omit this key to capture from the start position to the end of the string.
+   */
+  public function testLengthIsString() {
+    $configuration['length'] = '1';
+    $this->plugin = new Substr($configuration, 'map', []);
+    $this->plugin->transform(['foo'], $this->migrateExecutable, $this->row, 'destinationproperty');
+  }
+
+}

web/core/modules/migrate/tests/src/Unit/process/UrlEncodeTest.php

@@ -0,0 +1,66 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit\process;
+
+use Drupal\migrate\Plugin\migrate\process\UrlEncode;
+use Drupal\migrate\MigrateExecutable;
+use Drupal\migrate\MigrateMessage;
+use Drupal\migrate\Row;
+use Drupal\Tests\migrate\Unit\MigrateTestCase;
+
+/**
+ * @coversDefaultClass \Drupal\migrate\Plugin\migrate\process\UrlEncode
+ * @group file
+ */
+class UrlEncodeTest extends MigrateTestCase {
+
+  /**
+   * @inheritdoc
+   */
+  protected $migrationConfiguration = [
+    'id' => 'test',
+  ];
+
+  /**
+   * The data provider for testing URL encoding scenarios.
+   *
+   * @return array
+   *   An array of URLs to test.
+   */
+  public function urlDataProvider() {
+    return array(
+      'A URL with no characters requiring encoding' => array('http://example.com/normal_url.html', 'http://example.com/normal_url.html'),
+      'The definitive use case - encoding spaces in URLs' => array('http://example.com/url with spaces.html', 'http://example.com/url%20with%20spaces.html'),
+      'Definitive use case 2 - spaces in directories' => array('http://example.com/dir with spaces/foo.html', 'http://example.com/dir%20with%20spaces/foo.html'),
+      'Local filespecs without spaces should not be transformed' => array('/tmp/normal.txt', '/tmp/normal.txt'),
+      'Local filespecs with spaces should not be transformed' => array('/tmp/with spaces.txt', '/tmp/with spaces.txt'),
+      'Make sure URL characters (:, ?, &) are not encoded but others are.' => array('https://example.com/?a=b@c&d=e+f%', 'https://example.com/?a%3Db%40c&d%3De%2Bf%25'),
+    );
+  }
+
+  /**
+   * Cover various encoding scenarios.
+   * @dataProvider urlDataProvider
+   */
+  public function testUrls($input, $output) {
+    $this->assertEquals($output, $this->doTransform($input));
+  }
+
+  /**
+   * Perform the urlencode process plugin over the given value.
+   *
+   * @param string $value
+   *   URL to be encoded.
+   *
+   * @return string
+   *   Encoded URL.
+   */
+  protected function doTransform($value) {
+    $executable = new MigrateExecutable($this->getMigration(), new MigrateMessage());
+    $row = new Row();
+
+    return (new UrlEncode([], 'urlencode', []))
+      ->transform($value, $executable, $row, 'foobaz');
+  }
+
+}