diff -u b/core/modules/migrate_drupal/tests/src/Unit/source/d6/MenuLinkSourceTest.php b/core/modules/migrate_drupal/tests/src/Unit/source/d6/MenuLinkSourceTest.php
--- b/core/modules/migrate_drupal/tests/src/Unit/source/d6/MenuLinkSourceTest.php
+++ b/core/modules/migrate_drupal/tests/src/Unit/source/d6/MenuLinkSourceTest.php
@@ -29,19 +29,6 @@
     'source' => array(
       'plugin' => 'drupal6_menu_link',
     ),
-    'sourceIds' => array(
-      'mlid' => array(
-        // This is where the field schema would go but for now we need to
-        // specify the table alias for the key. Most likely this will be the
-        // same as BASE_ALIAS.
-        'alias' => 'ml',
-      ),
-    ),
-    'destinationIds' => array(
-      'mlid' => array(
-        // This is where the field schema would go.
-      ),
-    ),
   );
 
   protected $expectedResults = array(
diff -u b/core/modules/migrate_drupal/tests/src/Unit/source/d6/NodeRevisionByNodeTypeTest.php b/core/modules/migrate_drupal/tests/src/Unit/source/d6/NodeRevisionByNodeTypeTest.php
--- b/core/modules/migrate_drupal/tests/src/Unit/source/d6/NodeRevisionByNodeTypeTest.php
+++ b/core/modules/migrate_drupal/tests/src/Unit/source/d6/NodeRevisionByNodeTypeTest.php
@@ -26,16 +26,6 @@
       'plugin' => 'd6_node_revision',
       'node_type' => 'page',
     ],
-    'sourceIds' => [
-      'vid' => [
-        'alias' => 'v',
-      ],
-    ],
-    'destinationIds' => [
-      'vid' => [
-        // This is where the field schema would go.
-      ],
-    ],
   ];
 
   protected $databaseContents = [
diff -u b/core/modules/migrate_drupal/tests/src/Unit/source/d6/NodeRevisionTest.php b/core/modules/migrate_drupal/tests/src/Unit/source/d6/NodeRevisionTest.php
--- b/core/modules/migrate_drupal/tests/src/Unit/source/d6/NodeRevisionTest.php
+++ b/core/modules/migrate_drupal/tests/src/Unit/source/d6/NodeRevisionTest.php
@@ -25,16 +25,6 @@
     'source' => [
       'plugin' => 'd6_node_revision',
     ],
-    'sourceIds' => [
-      'vid' => [
-        'alias' => 'v',
-      ],
-    ],
-    'destinationIds' => [
-      'vid' => [
-        // This is where the field schema would go.
-      ],
-    ],
   ];
 
   protected $databaseContents = [