reverted:
--- b/core/modules/menu_link_content/tests/src/Unit/Plugin/migrate/source/d6/I18nMenuLinkSourceTest.php
+++ /dev/null
@@ -1,175 +0,0 @@
-<?php
-
-namespace Drupal\Tests\menu_link_content\Unit\Plugin\migrate\source\d6;
-
-use Drupal\Tests\migrate\Unit\MigrateSqlSourceTestCase;
-
-/**
- * Tests i18n menu link source plugin.
- *
- * @group config_translation
- */
-class I18nMenuLinkSourceTest extends MigrateSqlSourceTestCase {
-
-  const PLUGIN_CLASS = 'Drupal\menu_link_content\Plugin\migrate\source\d6\I18nMenuLink';
-
-  protected $migrationConfiguration = [
-    'id' => 'id',
-    'source' => [
-      'plugin' => 'test',
-    ],
-  ];
-
-  protected $menu_links = [
-    [
-      'menu_name' => 'menu-test-menu',
-      'mlid' => 138,
-      'plid' => 0,
-      'link_path' => 'admin',
-      'router_path' => 'admin',
-      'link_title' => 'Test 1',
-      'options' => ['attributes' => ['title' => 'Test menu link 1']],
-      'module' => 'menu',
-      'hidden' => 0,
-      'external' => 0,
-      'has_children' => 1,
-      'expanded' => 0,
-      'weight' => 15,
-      'depth' => 1,
-      'customized' => 1,
-      'p1' => '138',
-      'p2' => '0',
-      'p3' => '0',
-      'p4' => '0',
-      'p5' => '0',
-      'p6' => '0',
-      'p7' => '0',
-      'p8' => '0',
-      'p9' => '0',
-      'updated' => '0',
-      'description' => 'Test menu link 1',
-    ],
-    [
-      'menu_name' => 'menu-test-menu',
-      'mlid' => 139,
-      'plid' => 138,
-      'link_path' => 'admin/modules',
-      'router_path' => 'admin/modules',
-      'link_title' => 'Test 2',
-      'options' => ['attributes' => ['title' => 'Test menu link 2']],
-      'module' => 'menu',
-      'hidden' => 0,
-      'external' => 0,
-      'has_children' => 0,
-      'expanded' => 0,
-      'weight' => 12,
-      'depth' => 2,
-      'customized' => 1,
-      'p1' => '138',
-      'p2' => '139',
-      'p3' => '0',
-      'p4' => '0',
-      'p5' => '0',
-      'p6' => '0',
-      'p7' => '0',
-      'p8' => '0',
-      'p9' => '0',
-      'updated' => '0',
-      'description' => 'Test menu link 2',
-    ],
-  ];
-
-  protected $i18n_strings = [
-    [
-      'lid' => 1,
-      'objectid' => 139,
-      'type' => 'item',
-      'property' => 'title',
-      'objectindex' => 0,
-      'format' => 0,
-    ],
-    [
-      'lid' => 2,
-      'objectid' => 139,
-      'type' => 'item',
-      'property' => 'description',
-      'objectindex' => 0,
-      'format' => 0,
-    ],
-    [
-      'lid' => 3,
-      'objectid' => 138,
-      'type' => 'item',
-      'property' => 'description',
-      'objectindex' => 0,
-      'format' => 0,
-    ]
-  ];
-
-  protected $locales_target = [
-    [
-      'lid' => 1,
-      'language' => 'fr',
-      'translation' => 'fr - title translation',
-      'plid' => 0,
-      'plural' => 0,
-      'u18n_status' => 0,
-    ],
-    [
-      'lid' => 2,
-      'language' => 'fr',
-      'translation' => 'fr - description translation',
-      'plid' => 0,
-      'plural' => 0,
-      'u18n_status' => 0,
-    ],
-    [
-      'lid' => 3,
-      'language' => 'zu',
-      'translation' => 'zu - description translation',
-      'plid' => 0,
-      'plural' => 0,
-      'u18n_status' => 0,
-    ],
-  ];
-
-  protected $expectedResults = [
-    [
-      'mlid' => 138,
-      'link_path' => 'admin',
-      'options' => 'a:1:{s:10:"attributes";a:1:{s:5:"title";s:16:"Test menu link 1";}}',
-      'objectid' => 138,
-      'language' => 'zu',
-      'ltlid' => 3,
-      'title' => 'Test 1',
-      'description' => 'zu - description translation',
-
-    ],
-    [
-      'mlid' => 139,
-      'link_path' => 'admin/modules',
-      'options' => 'a:1:{s:10:"attributes";a:1:{s:5:"title";s:16:"Test menu link 2";}}',
-      'objectid' => 139,
-      'language' => 'fr',
-      'ltlid' => 1,
-      'title' => 'fr - title translation',
-      'description' => 'fr - description translation',
-    ],
-  ];
-
-  /**
-   * {@inheritdoc}
-   */
-  protected function setUp() {
-    $this->databaseContents['menu_links'] = $this->menu_links;
-    $this->databaseContents['i18n_strings'] = $this->i18n_strings;
-    $this->databaseContents['locales_target'] = $this->locales_target;
-
-    array_walk($this->databaseContents['menu_links'], function (&$row) {
-      $row['options'] = serialize($row['options']);
-    });
-
-    parent::setUp();
-  }
-
-}
only in patch2:
unchanged:
--- /dev/null
+++ b/core/modules/menu_link_content/tests/src/Kernel/Plugin/migrate/source/d6/I18nMenuLinkSourceTest.php
@@ -0,0 +1,173 @@
+<?php
+
+namespace Drupal\Tests\menu_link_content\Unit\Plugin\migrate\source\d6;
+
+use Drupal\Tests\migrate\Kernel\MigrateSqlSourceTestBase;
+
+/**
+ * Tests i18n menu link source plugin.
+ *
+ * @covers \Drupal\menu_link_content\Plugin\migrate\source\d6\I18nMenuLink
+ * @group config_translation
+ */
+class I18nMenuLinkSourceTest extends MigrateSqlSourceTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['menu_link_content', 'migrate_drupal'];
+
+  protected $menu_links = [
+    [
+      'menu_name' => 'menu-test-menu',
+      'mlid' => 138,
+      'plid' => 0,
+      'link_path' => 'admin',
+      'router_path' => 'admin',
+      'link_title' => 'Test 1',
+      'options' => ['attributes' => ['title' => 'Test menu link 1']],
+      'module' => 'menu',
+      'hidden' => 0,
+      'external' => 0,
+      'has_children' => 1,
+      'expanded' => 0,
+      'weight' => 15,
+      'depth' => 1,
+      'customized' => 1,
+      'p1' => '138',
+      'p2' => '0',
+      'p3' => '0',
+      'p4' => '0',
+      'p5' => '0',
+      'p6' => '0',
+      'p7' => '0',
+      'p8' => '0',
+      'p9' => '0',
+      'updated' => '0',
+      'description' => 'Test menu link 1',
+    ],
+    [
+      'menu_name' => 'menu-test-menu',
+      'mlid' => 139,
+      'plid' => 138,
+      'link_path' => 'admin/modules',
+      'router_path' => 'admin/modules',
+      'link_title' => 'Test 2',
+      'options' => ['attributes' => ['title' => 'Test menu link 2']],
+      'module' => 'menu',
+      'hidden' => 0,
+      'external' => 0,
+      'has_children' => 0,
+      'expanded' => 0,
+      'weight' => 12,
+      'depth' => 2,
+      'customized' => 1,
+      'p1' => '138',
+      'p2' => '139',
+      'p3' => '0',
+      'p4' => '0',
+      'p5' => '0',
+      'p6' => '0',
+      'p7' => '0',
+      'p8' => '0',
+      'p9' => '0',
+      'updated' => '0',
+      'description' => 'Test menu link 2',
+    ],
+  ];
+
+  protected $i18n_strings = [
+    [
+      'lid' => 1,
+      'objectid' => 139,
+      'type' => 'item',
+      'property' => 'title',
+      'objectindex' => 0,
+      'format' => 0,
+    ],
+    [
+      'lid' => 2,
+      'objectid' => 139,
+      'type' => 'item',
+      'property' => 'description',
+      'objectindex' => 0,
+      'format' => 0,
+    ],
+    [
+      'lid' => 3,
+      'objectid' => 138,
+      'type' => 'item',
+      'property' => 'description',
+      'objectindex' => 0,
+      'format' => 0,
+    ]
+  ];
+
+  protected $locales_target = [
+    [
+      'lid' => 1,
+      'language' => 'fr',
+      'translation' => 'fr - title translation',
+      'plid' => 0,
+      'plural' => 0,
+      'u18n_status' => 0,
+    ],
+    [
+      'lid' => 2,
+      'language' => 'fr',
+      'translation' => 'fr - description translation',
+      'plid' => 0,
+      'plural' => 0,
+      'u18n_status' => 0,
+    ],
+    [
+      'lid' => 3,
+      'language' => 'zu',
+      'translation' => 'zu - description translation',
+      'plid' => 0,
+      'plural' => 0,
+      'u18n_status' => 0,
+    ],
+  ];
+
+  protected $expectedResults = [
+    [
+      'mlid' => 138,
+      'link_path' => 'admin',
+      'options' => 'a:1:{s:10:"attributes";a:1:{s:5:"title";s:16:"Test menu link 1";}}',
+      'objectid' => 138,
+      'language' => 'zu',
+      'ltlid' => 3,
+      'title' => 'Test 1',
+      'description' => 'zu - description translation',
+
+    ],
+    [
+      'mlid' => 139,
+      'link_path' => 'admin/modules',
+      'options' => 'a:1:{s:10:"attributes";a:1:{s:5:"title";s:16:"Test menu link 2";}}',
+      'objectid' => 139,
+      'language' => 'fr',
+      'ltlid' => 1,
+      'title' => 'fr - title translation',
+      'description' => 'fr - description translation',
+    ],
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  public function providerSource() {
+    $test[0][0]['menu_links'] = $this->menu_links;
+    $test[0][0]['i18n_strings'] = $this->i18n_strings;
+    $test[0][0]['locales_target'] = $this->locales_target;
+
+    array_walk($test[0][0]['menu_links'], function (&$row) {
+      $row['options'] = serialize($row['options']);
+    });
+
+    $test[0][1] = $this->expectedResults;
+    return $test;
+  }
+
+}