Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

core/modules/path/tests/src/Unit/Migrate/UrlAliasTestBase.php

@@ -0,0 +1,25 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\path\Unit\Migrate\UrlAliasTestBase.
+ */
+
+namespace Drupal\Tests\path\Unit\Migrate;
+
+use Drupal\Tests\migrate\Unit\MigrateSqlSourceTestCase;
+
+/**
+ * Base class for url_alias source tests.
+ */
+abstract class UrlAliasTestBase extends MigrateSqlSourceTestCase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    $this->databaseContents['url_alias'] = $this->expectedResults;
+    parent::setUp();
+  }
+
+}

core/modules/path/tests/src/Unit/Migrate/d6/UrlAliasTest.php

@@ -7,14 +7,14 @@
 
 namespace Drupal\Tests\path\Unit\Migrate\d6;
 
-use Drupal\Tests\migrate\Unit\MigrateSqlSourceTestCase;
+use Drupal\Tests\path\Unit\Migrate\UrlAliasTestBase;
 
 /**
- * Tests the D6 url alias migrations.
+ * Tests the d6_url_alias source plugin.
  *
  * @group path
  */
-class UrlAliasTest extends MigrateSqlSourceTestCase {
+class UrlAliasTest extends UrlAliasTestBase {
 
   const PLUGIN_CLASS = 'Drupal\path\Plugin\migrate\source\d6\UrlAlias';
 
@@ -41,14 +41,4 @@ class UrlAliasTest extends MigrateSqlSourceTestCase {
     ),
   );
 
-  /**
-   * {@inheritdoc}
-   */
-  protected function setUp() {
-    foreach ($this->expectedResults as $row) {
-      $this->databaseContents['url_alias'][] = $row;
-    }
-    parent::setUp();
-  }
-
 }

core/modules/path/tests/src/Unit/Migrate/d7/UrlAliasTest.php

@@ -0,0 +1,43 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\path\Unit\Migrate\d7\UrlAliasTest.
+ */
+
+namespace Drupal\Tests\path\Unit\Migrate\d7;
+
+use Drupal\Tests\path\Unit\Migrate\UrlAliasTestBase;
+
+/**
+ * Tests the d7_url_alias source plugin.
+ *
+ * @group path
+ */
+class UrlAliasTest extends UrlAliasTestBase {
+
+  const PLUGIN_CLASS = 'Drupal\path\Plugin\migrate\source\d7\UrlAlias';
+
+  protected $migrationConfiguration = array(
+    'id' => 'test',
+    'source' => array(
+      'plugin' => 'd7_url_alias',
+    ),
+  );
+
+  protected $expectedResults = array(
+    array(
+      'pid' => 1,
+      'source' => 'node/1',
+      'alias' => 'test-article',
+      'language' => 'en',
+    ),
+    array(
+      'pid' => 2,
+      'source' => 'node/2',
+      'alias' => 'another-alias',
+      'language' => 'en',
+    ),
+  );
+
+}