Update to Drupal 8.2.2. For more information, see https://www.drupal.org/project/drupal/releases/8.2.2

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

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'),
+    ];
+  }
+
+}

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

@@ -18,9 +18,11 @@ function migrate_prepare_row_test_migrate_prepare_row(Row $row, MigrateSourceInt
   // 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') {
-    throw new MigrateSkipRowException('', FALSE);
+    // Don't record mapping but record a message.
+    throw new MigrateSkipRowException('skip_and_dont_record message', FALSE);
   }
 }

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;
+  }
+
+}