diff --git a/core/modules/action/src/Tests/Migrate/d6/MigrateActionConfigsTest.php b/core/modules/action/src/Tests/Migrate/d6/MigrateActionConfigsTest.php
index b4b2540..779db2f 100644
--- a/core/modules/action/src/Tests/Migrate/d6/MigrateActionConfigsTest.php
+++ b/core/modules/action/src/Tests/Migrate/d6/MigrateActionConfigsTest.php
@@ -31,7 +31,6 @@ class MigrateActionConfigsTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_action_settings');
   }
 
diff --git a/core/modules/aggregator/src/Tests/Migrate/d6/MigrateAggregatorConfigsTest.php b/core/modules/aggregator/src/Tests/Migrate/d6/MigrateAggregatorConfigsTest.php
index 33d0893..7cef210 100644
--- a/core/modules/aggregator/src/Tests/Migrate/d6/MigrateAggregatorConfigsTest.php
+++ b/core/modules/aggregator/src/Tests/Migrate/d6/MigrateAggregatorConfigsTest.php
@@ -31,7 +31,6 @@ class MigrateAggregatorConfigsTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_aggregator_settings');
   }
 
diff --git a/core/modules/aggregator/src/Tests/Migrate/d6/MigrateAggregatorFeedTest.php b/core/modules/aggregator/src/Tests/Migrate/d6/MigrateAggregatorFeedTest.php
index 2264e28..77f6127 100644
--- a/core/modules/aggregator/src/Tests/Migrate/d6/MigrateAggregatorFeedTest.php
+++ b/core/modules/aggregator/src/Tests/Migrate/d6/MigrateAggregatorFeedTest.php
@@ -25,7 +25,6 @@ class MigrateAggregatorFeedTest extends MigrateDrupal6TestBase {
   protected function setUp() {
     parent::setUp();
     $this->installEntitySchema('aggregator_feed');
-    $this->loadDumps(['AggregatorFeed.php']);
     $this->executeMigration('d6_aggregator_feed');
   }
 
diff --git a/core/modules/aggregator/src/Tests/Migrate/d6/MigrateAggregatorItemTest.php b/core/modules/aggregator/src/Tests/Migrate/d6/MigrateAggregatorItemTest.php
index 20e4ad7..3d5716c 100644
--- a/core/modules/aggregator/src/Tests/Migrate/d6/MigrateAggregatorItemTest.php
+++ b/core/modules/aggregator/src/Tests/Migrate/d6/MigrateAggregatorItemTest.php
@@ -45,7 +45,6 @@ protected function setUp() {
     ));
     $entity->enforceIsNew();
     $entity->save();
-    $this->loadDumps(['AggregatorItem.php']);
     $this->executeMigration('d6_aggregator_item');
   }
 
diff --git a/core/modules/aggregator/src/Tests/Migrate/d7/MigrateAggregatorSettingsTest.php b/core/modules/aggregator/src/Tests/Migrate/d7/MigrateAggregatorSettingsTest.php
index b95835f..37c77dc 100644
--- a/core/modules/aggregator/src/Tests/Migrate/d7/MigrateAggregatorSettingsTest.php
+++ b/core/modules/aggregator/src/Tests/Migrate/d7/MigrateAggregatorSettingsTest.php
@@ -24,7 +24,6 @@ class MigrateAggregatorSettingsTest extends MigrateDrupal7TestBase {
   protected function setUp() {
     parent::setUp();
     $this->installConfig(static::$modules);
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d7_aggregator_settings');
   }
 
diff --git a/core/modules/ban/src/Tests/Migrate/d7/MigrateBlockedIPsTest.php b/core/modules/ban/src/Tests/Migrate/d7/MigrateBlockedIPsTest.php
index 3efa4a9..6a635fb 100644
--- a/core/modules/ban/src/Tests/Migrate/d7/MigrateBlockedIPsTest.php
+++ b/core/modules/ban/src/Tests/Migrate/d7/MigrateBlockedIPsTest.php
@@ -32,7 +32,6 @@ class MigrateBlockedIPsTest extends MigrateDrupal7TestBase {
   protected function setUp() {
     parent::setUp();
     $this->installSchema('ban', ['ban_ip']);
-    $this->loadDumps(['BlockedIps.php']);
     $this->executeMigration('d7_blocked_ips');
   }
 
diff --git a/core/modules/block/src/Tests/Migrate/d6/MigrateBlockTest.php b/core/modules/block/src/Tests/Migrate/d6/MigrateBlockTest.php
index 232fa4a..d1d3696 100644
--- a/core/modules/block/src/Tests/Migrate/d6/MigrateBlockTest.php
+++ b/core/modules/block/src/Tests/Migrate/d6/MigrateBlockTest.php
@@ -71,7 +71,6 @@ protected function setUp() {
     // Install one of D8's test themes.
     \Drupal::service('theme_handler')->install(array('test_theme'));
 
-    $this->loadDumps(['Blocks.php', 'BlocksRoles.php', 'AggregatorFeed.php']);
     $this->executeMigration('d6_block');
   }
 
diff --git a/core/modules/block_content/src/Tests/Migrate/d6/MigrateBlockContentTest.php b/core/modules/block_content/src/Tests/Migrate/d6/MigrateBlockContentTest.php
index 3a68161..a4c5a57 100644
--- a/core/modules/block_content/src/Tests/Migrate/d6/MigrateBlockContentTest.php
+++ b/core/modules/block_content/src/Tests/Migrate/d6/MigrateBlockContentTest.php
@@ -35,7 +35,6 @@ protected function setUp() {
         array(array(2), array('full_html'))
       )
     ));
-    $this->loadDumps(['Boxes.php']);
     $this->executeMigration('d6_custom_block');
   }
 
diff --git a/core/modules/book/src/Tests/Migrate/d6/MigrateBookConfigsTest.php b/core/modules/book/src/Tests/Migrate/d6/MigrateBookConfigsTest.php
index 9ae1030..9d7a229 100644
--- a/core/modules/book/src/Tests/Migrate/d6/MigrateBookConfigsTest.php
+++ b/core/modules/book/src/Tests/Migrate/d6/MigrateBookConfigsTest.php
@@ -31,7 +31,6 @@ class MigrateBookConfigsTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_book_settings');
   }
 
diff --git a/core/modules/book/src/Tests/Migrate/d6/MigrateBookTest.php b/core/modules/book/src/Tests/Migrate/d6/MigrateBookTest.php
index ea7846e..b0ebebb 100644
--- a/core/modules/book/src/Tests/Migrate/d6/MigrateBookTest.php
+++ b/core/modules/book/src/Tests/Migrate/d6/MigrateBookTest.php
@@ -42,8 +42,6 @@ protected function setUp() {
       $id_mappings['d6_node'][] = array(array($i), array($i));
     }
     $this->prepareMigrations($id_mappings);
-    // Load database dumps to provide source data.
-    $this->loadDumps(['Book.php', 'MenuLinks.php']);
     $this->executeMigration('d6_book');
   }
 
diff --git a/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentTest.php b/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentTest.php
index 19e74fe..cd23f6a 100644
--- a/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentTest.php
+++ b/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentTest.php
@@ -56,16 +56,6 @@ protected function setUp() {
       'd6_comment_entity_form_display' => array(array(array('story'), array('node', 'story', 'default', 'comment'))),
     );
     $this->prepareMigrations($id_mappings);
-
-    $this->loadDumps([
-      'Node.php',
-      'NodeRevisions.php',
-      'ContentTypeStory.php',
-      'ContentTypeTestPlanet.php',
-      'Variable.php',
-      'NodeType.php',
-      'Comments.php',
-    ]);
     $this->executeMigration('d6_comment');
   }
 
diff --git a/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentTypeTest.php b/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentTypeTest.php
index fd0b3f1..8d25d1c 100644
--- a/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentTypeTest.php
+++ b/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentTypeTest.php
@@ -24,12 +24,9 @@ class MigrateCommentTypeTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-
     $this->installEntitySchema('node');
     $this->installEntitySchema('comment');
     $this->installConfig(['node', 'comment']);
-
-    $this->loadDumps(['Variable.php', 'NodeType.php']);
     $this->executeMigration('d6_comment_type');
   }
 
diff --git a/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentVariableDisplayBase.php b/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentVariableDisplayBase.php
index d36dd03..0995df0 100644
--- a/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentVariableDisplayBase.php
+++ b/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentVariableDisplayBase.php
@@ -64,7 +64,6 @@ protected function setUp() {
       ),
     );
     $this->prepareMigrations($id_mappings);
-    $this->loadDumps(['Variable.php', 'NodeType.php']);
     $this->executeMigration(static::MIGRATION);
 
   }
diff --git a/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentVariableEntityFormDisplaySubjectTest.php b/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentVariableEntityFormDisplaySubjectTest.php
index 6a7f27f..9212f72 100644
--- a/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentVariableEntityFormDisplaySubjectTest.php
+++ b/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentVariableEntityFormDisplaySubjectTest.php
@@ -42,7 +42,6 @@ protected function setUp() {
       ),
     );
     $this->prepareMigrations($id_mappings);
-    $this->loadDumps(['Variable.php', 'NodeType.php']);
     $this->executeMigration('d6_comment_entity_form_display_subject');
   }
 
diff --git a/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentVariableFieldTest.php b/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentVariableFieldTest.php
index 3d55fb5..468c18d 100644
--- a/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentVariableFieldTest.php
+++ b/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentVariableFieldTest.php
@@ -41,7 +41,6 @@ protected function setUp() {
       ),
     );
     $this->prepareMigrations($id_mappings);
-    $this->loadDumps(['Variable.php', 'NodeType.php']);
     $this->executeMigration('d6_comment_field');
   }
 
diff --git a/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentVariableInstanceTest.php b/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentVariableInstanceTest.php
index 45b0950..1daf99f 100644
--- a/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentVariableInstanceTest.php
+++ b/core/modules/comment/src/Tests/Migrate/d6/MigrateCommentVariableInstanceTest.php
@@ -49,7 +49,6 @@ protected function setUp() {
       'type' => 'comment',
       'translatable' => '0',
     ))->save();
-    $this->loadDumps(['Variable.php', 'NodeType.php']);
     $this->executeMigration('d6_comment_field_instance');
   }
 
diff --git a/core/modules/contact/src/Tests/Migrate/d6/MigrateContactCategoryTest.php b/core/modules/contact/src/Tests/Migrate/d6/MigrateContactCategoryTest.php
index 459b515..669ea7c 100644
--- a/core/modules/contact/src/Tests/Migrate/d6/MigrateContactCategoryTest.php
+++ b/core/modules/contact/src/Tests/Migrate/d6/MigrateContactCategoryTest.php
@@ -29,7 +29,6 @@ class MigrateContactCategoryTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Contact.php']);
     $this->executeMigration('d6_contact_category');
   }
 
diff --git a/core/modules/contact/src/Tests/Migrate/d6/MigrateContactConfigsTest.php b/core/modules/contact/src/Tests/Migrate/d6/MigrateContactConfigsTest.php
index 99eb405..9f9e673 100644
--- a/core/modules/contact/src/Tests/Migrate/d6/MigrateContactConfigsTest.php
+++ b/core/modules/contact/src/Tests/Migrate/d6/MigrateContactConfigsTest.php
@@ -39,7 +39,6 @@ protected function setUp() {
       ),
     );
     $this->prepareMigrations($id_mappings);
-    $this->loadDumps(['Variable.php', 'Contact.php']);
     $this->executeMigration('d6_contact_settings');
   }
 
diff --git a/core/modules/dblog/src/Tests/Migrate/d6/MigrateDblogConfigsTest.php b/core/modules/dblog/src/Tests/Migrate/d6/MigrateDblogConfigsTest.php
index f3dcfa1..4fb4a76 100644
--- a/core/modules/dblog/src/Tests/Migrate/d6/MigrateDblogConfigsTest.php
+++ b/core/modules/dblog/src/Tests/Migrate/d6/MigrateDblogConfigsTest.php
@@ -31,7 +31,6 @@ class MigrateDblogConfigsTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_dblog_settings');
   }
 
diff --git a/core/modules/dblog/src/Tests/Migrate/d7/MigrateDblogConfigsTest.php b/core/modules/dblog/src/Tests/Migrate/d7/MigrateDblogConfigsTest.php
index 7d1f28a..6e088f2 100644
--- a/core/modules/dblog/src/Tests/Migrate/d7/MigrateDblogConfigsTest.php
+++ b/core/modules/dblog/src/Tests/Migrate/d7/MigrateDblogConfigsTest.php
@@ -29,7 +29,6 @@ class MigrateDblogConfigsTest extends MigrateDrupal7TestBase {
   protected function setUp() {
     parent::setUp();
     $this->installConfig(static::$modules);
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d7_dblog_settings');
   }
 
diff --git a/core/modules/field/src/Tests/Migrate/d6/MigrateFieldFormatterSettingsTest.php b/core/modules/field/src/Tests/Migrate/d6/MigrateFieldFormatterSettingsTest.php
index b556dcf..9198d06 100644
--- a/core/modules/field/src/Tests/Migrate/d6/MigrateFieldFormatterSettingsTest.php
+++ b/core/modules/field/src/Tests/Migrate/d6/MigrateFieldFormatterSettingsTest.php
@@ -64,14 +64,6 @@ protected function setUp() {
       ),
     );
     $this->prepareMigrations($id_mappings);
-
-    $this->loadDumps([
-      'ContentNodeFieldInstance.php',
-      'ContentNodeField.php',
-      'ContentFieldTest.php',
-      'ContentFieldTestTwo.php',
-      'ContentFieldMultivalue.php',
-    ]);
     $this->executeMigration('d6_field_formatter_settings');
   }
 
diff --git a/core/modules/field/src/Tests/Migrate/d6/MigrateFieldInstanceTest.php b/core/modules/field/src/Tests/Migrate/d6/MigrateFieldInstanceTest.php
index ca21557..61bf944 100644
--- a/core/modules/field/src/Tests/Migrate/d6/MigrateFieldInstanceTest.php
+++ b/core/modules/field/src/Tests/Migrate/d6/MigrateFieldInstanceTest.php
@@ -66,13 +66,6 @@ protected function setUp() {
     entity_create('node_type', array('type' => 'story'))->save();
     entity_create('node_type', array('type' => 'test_page'))->save();
 
-    $this->loadDumps([
-      'ContentNodeFieldInstance.php',
-      'ContentNodeField.php',
-      'ContentFieldTest.php',
-      'ContentFieldTestTwo.php',
-      'ContentFieldMultivalue.php',
-    ]);
     $this->createFields();
     $this->executeMigration('d6_field_instance');
   }
diff --git a/core/modules/field/src/Tests/Migrate/d6/MigrateFieldTest.php b/core/modules/field/src/Tests/Migrate/d6/MigrateFieldTest.php
index 907bba5..30ce60a 100644
--- a/core/modules/field/src/Tests/Migrate/d6/MigrateFieldTest.php
+++ b/core/modules/field/src/Tests/Migrate/d6/MigrateFieldTest.php
@@ -29,13 +29,6 @@ class MigrateFieldTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps([
-      'ContentNodeFieldInstance.php',
-      'ContentNodeField.php',
-      'ContentFieldTest.php',
-      'ContentFieldTestTwo.php',
-      'ContentFieldMultivalue.php',
-    ]);
     $this->executeMigration('d6_field');
   }
 
diff --git a/core/modules/field/src/Tests/Migrate/d6/MigrateFieldWidgetSettingsTest.php b/core/modules/field/src/Tests/Migrate/d6/MigrateFieldWidgetSettingsTest.php
index a3232c4..37586a2 100644
--- a/core/modules/field/src/Tests/Migrate/d6/MigrateFieldWidgetSettingsTest.php
+++ b/core/modules/field/src/Tests/Migrate/d6/MigrateFieldWidgetSettingsTest.php
@@ -61,13 +61,6 @@ protected function setUp() {
       ),
     );
     $this->prepareMigrations($id_mappings);
-    $this->loadDumps([
-      'ContentNodeFieldInstance.php',
-      'ContentNodeField.php',
-      'ContentFieldTest.php',
-      'ContentFieldTestTwo.php',
-      'ContentFieldMultivalue.php',
-    ]);
     $this->executeMigration('d6_field_instance_widget_settings');
   }
 
diff --git a/core/modules/file/src/Tests/Migrate/d6/MigrateFileConfigsTest.php b/core/modules/file/src/Tests/Migrate/d6/MigrateFileConfigsTest.php
index c7964e4..c78c8b7 100644
--- a/core/modules/file/src/Tests/Migrate/d6/MigrateFileConfigsTest.php
+++ b/core/modules/file/src/Tests/Migrate/d6/MigrateFileConfigsTest.php
@@ -31,7 +31,6 @@ class MigrateFileConfigsTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_file_settings');
   }
 
diff --git a/core/modules/file/src/Tests/Migrate/d6/MigrateFileTest.php b/core/modules/file/src/Tests/Migrate/d6/MigrateFileTest.php
index c5b68fc..2f68b2d 100644
--- a/core/modules/file/src/Tests/Migrate/d6/MigrateFileTest.php
+++ b/core/modules/file/src/Tests/Migrate/d6/MigrateFileTest.php
@@ -44,7 +44,6 @@ protected function setUp() {
     $this->installEntitySchema('file');
     $this->installConfig(['file']);
 
-    $this->loadDumps(['Files.php']);
     /** @var \Drupal\migrate\Entity\MigrationInterface $migration */
     $migration = entity_load('migration', 'd6_file');
     $source = $migration->get('source');
@@ -74,8 +73,6 @@ public function testFiles() {
     // Test that we can re-import and also test with file_directory_path set.
     db_truncate(entity_load('migration', 'd6_file')->getIdMap()->mapTableName())->execute();
 
-    $this->loadDumps(['Variable.php']);
-
     // Update the file_directory_path.
     Database::getConnection('default', 'migrate')
       ->update('variable')
diff --git a/core/modules/file/src/Tests/Migrate/d6/MigrateUploadBase.php b/core/modules/file/src/Tests/Migrate/d6/MigrateUploadBase.php
index 17ea473..5cff822 100644
--- a/core/modules/file/src/Tests/Migrate/d6/MigrateUploadBase.php
+++ b/core/modules/file/src/Tests/Migrate/d6/MigrateUploadBase.php
@@ -94,13 +94,6 @@ protected function setUp() {
         $node->save();
       }
     }
-    $this->loadDumps([
-      'Node.php',
-      'NodeRevisions.php',
-      'ContentTypeStory.php',
-      'ContentTypeTestPlanet.php',
-      'Upload.php',
-    ]);
   }
 
 }
diff --git a/core/modules/file/src/Tests/Migrate/d6/MigrateUploadEntityDisplayTest.php b/core/modules/file/src/Tests/Migrate/d6/MigrateUploadEntityDisplayTest.php
index ff170a3..83eb0af 100644
--- a/core/modules/file/src/Tests/Migrate/d6/MigrateUploadEntityDisplayTest.php
+++ b/core/modules/file/src/Tests/Migrate/d6/MigrateUploadEntityDisplayTest.php
@@ -39,8 +39,6 @@ protected function setUp() {
       ),
     );
     $this->prepareMigrations($id_mappings);
-
-    $this->loadDumps(['NodeType.php', 'Variable.php']);
     $this->executeMigration('d6_upload_entity_display');
   }
 
diff --git a/core/modules/file/src/Tests/Migrate/d6/MigrateUploadEntityFormDisplayTest.php b/core/modules/file/src/Tests/Migrate/d6/MigrateUploadEntityFormDisplayTest.php
index b72f645..6023f51 100644
--- a/core/modules/file/src/Tests/Migrate/d6/MigrateUploadEntityFormDisplayTest.php
+++ b/core/modules/file/src/Tests/Migrate/d6/MigrateUploadEntityFormDisplayTest.php
@@ -39,8 +39,6 @@ protected function setUp() {
       ),
     );
     $this->prepareMigrations($id_mappings);
-
-    $this->loadDumps(['NodeType.php', 'Variable.php']);
     $this->executeMigration('d6_upload_entity_form_display');
   }
 
diff --git a/core/modules/file/src/Tests/Migrate/d6/MigrateUploadInstanceTest.php b/core/modules/file/src/Tests/Migrate/d6/MigrateUploadInstanceTest.php
index 1a61af7..998912a 100644
--- a/core/modules/file/src/Tests/Migrate/d6/MigrateUploadInstanceTest.php
+++ b/core/modules/file/src/Tests/Migrate/d6/MigrateUploadInstanceTest.php
@@ -51,7 +51,6 @@ protected function setUp() {
       'translatable' => '0',
     ))->save();
 
-    $this->loadDumps(['NodeType.php', 'Variable.php']);
     $this->executeMigration('d6_upload_field_instance');
   }
 
diff --git a/core/modules/file/src/Tests/Migrate/d7/MigrateFileTest.php b/core/modules/file/src/Tests/Migrate/d7/MigrateFileTest.php
index 4dedfbb..da1a6d2 100644
--- a/core/modules/file/src/Tests/Migrate/d7/MigrateFileTest.php
+++ b/core/modules/file/src/Tests/Migrate/d7/MigrateFileTest.php
@@ -26,7 +26,6 @@ class MigrateFileTest extends MigrateDrupal7TestBase {
   protected function setUp() {
     parent::setUp();
 
-    $this->loadDumps(['FileManaged.php', 'Variable.php']);
     $this->installEntitySchema('file');
 
     $fs = \Drupal::service('file_system');
diff --git a/core/modules/filter/src/Tests/Migrate/d6/MigrateFilterFormatTest.php b/core/modules/filter/src/Tests/Migrate/d6/MigrateFilterFormatTest.php
index 62f374b..ac5e1ce 100644
--- a/core/modules/filter/src/Tests/Migrate/d6/MigrateFilterFormatTest.php
+++ b/core/modules/filter/src/Tests/Migrate/d6/MigrateFilterFormatTest.php
@@ -26,7 +26,6 @@ class MigrateFilterFormatTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Filters.php', 'FilterFormats.php', 'Variable.php']);
     $this->executeMigration('d6_filter_format');
   }
 
diff --git a/core/modules/filter/src/Tests/Migrate/d7/MigrateFilterFormatTest.php b/core/modules/filter/src/Tests/Migrate/d7/MigrateFilterFormatTest.php
index ffb3ea5..ef4a574 100644
--- a/core/modules/filter/src/Tests/Migrate/d7/MigrateFilterFormatTest.php
+++ b/core/modules/filter/src/Tests/Migrate/d7/MigrateFilterFormatTest.php
@@ -28,7 +28,6 @@ class MigrateFilterFormatTest extends MigrateDrupal7TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Filter.php', 'FilterFormat.php', 'Variable.php']);
     $this->executeMigration('d7_filter_format');
   }
 
diff --git a/core/modules/forum/src/Tests/Migrate/d6/MigrateForumConfigsTest.php b/core/modules/forum/src/Tests/Migrate/d6/MigrateForumConfigsTest.php
index 803de4b..8062538 100644
--- a/core/modules/forum/src/Tests/Migrate/d6/MigrateForumConfigsTest.php
+++ b/core/modules/forum/src/Tests/Migrate/d6/MigrateForumConfigsTest.php
@@ -36,7 +36,6 @@ protected function setUp() {
         array(array(1), array('vocabulary_1_i_0_')),
       )
     ));
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_forum_settings');
   }
 
diff --git a/core/modules/locale/src/Tests/Migrate/MigrateLocaleConfigsTest.php b/core/modules/locale/src/Tests/Migrate/MigrateLocaleConfigsTest.php
index ffa5277..ceb34cd 100644
--- a/core/modules/locale/src/Tests/Migrate/MigrateLocaleConfigsTest.php
+++ b/core/modules/locale/src/Tests/Migrate/MigrateLocaleConfigsTest.php
@@ -31,7 +31,6 @@ class MigrateLocaleConfigsTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('locale_settings');
   }
 
diff --git a/core/modules/menu_link_content/src/Tests/Migrate/d6/MigrateMenuLinkTest.php b/core/modules/menu_link_content/src/Tests/Migrate/d6/MigrateMenuLinkTest.php
index cf21ebd..5fd0cbf 100644
--- a/core/modules/menu_link_content/src/Tests/Migrate/d6/MigrateMenuLinkTest.php
+++ b/core/modules/menu_link_content/src/Tests/Migrate/d6/MigrateMenuLinkTest.php
@@ -42,7 +42,6 @@ protected function setUp() {
       ),
     ));
 
-    $this->loadDumps(['MenuLinks.php']);
     $this->executeMigration('d6_menu_links');
   }
 
diff --git a/core/modules/menu_ui/src/Tests/Migrate/MigrateMenuSettingsTest.php b/core/modules/menu_ui/src/Tests/Migrate/MigrateMenuSettingsTest.php
index 46de706..c1655c6 100644
--- a/core/modules/menu_ui/src/Tests/Migrate/MigrateMenuSettingsTest.php
+++ b/core/modules/menu_ui/src/Tests/Migrate/MigrateMenuSettingsTest.php
@@ -24,7 +24,6 @@ class MigrateMenuSettingsTest extends MigrateDrupal7TestBase {
   protected function setUp() {
     parent::setUp();
     $this->installConfig(['menu_ui']);
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('menu_settings');
   }
 
diff --git a/core/modules/migrate_drupal/src/Tests/MigrateDrupalTestBase.php b/core/modules/migrate_drupal/src/Tests/MigrateDrupalTestBase.php
index 9d4e1a2..f007b31 100644
--- a/core/modules/migrate_drupal/src/Tests/MigrateDrupalTestBase.php
+++ b/core/modules/migrate_drupal/src/Tests/MigrateDrupalTestBase.php
@@ -30,7 +30,8 @@
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['System.php']);
+    $tables = file_scan_directory($this->getDumpDirectory(), '/.php$/', array('recurse' => FALSE));
+    $this->loadDumps(array_keys($tables));
 
     $this->installEntitySchema('user');
     $this->installConfig(['migrate_drupal', 'system']);
@@ -47,14 +48,6 @@ protected function getDumpDirectory() {
   }
 
   /**
-   * {@inheritdoc}
-   */
-  protected function loadDumps(array $files, $method = 'load') {
-    $files = array_map(function($file) { return $this->getDumpDirectory() . '/' . $file; }, $files);
-    parent::loadDumps($files, $method);
-  }
-
-  /**
    * Turn all the migration templates for the specified drupal version into
    * real migration entities so we can test them.
    *
diff --git a/core/modules/migrate_drupal/src/Tests/MigrateFullDrupalTestBase.php b/core/modules/migrate_drupal/src/Tests/MigrateFullDrupalTestBase.php
index 98289c0..acbb24b 100644
--- a/core/modules/migrate_drupal/src/Tests/MigrateFullDrupalTestBase.php
+++ b/core/modules/migrate_drupal/src/Tests/MigrateFullDrupalTestBase.php
@@ -29,14 +29,6 @@
   protected static $blacklist = [];
 
   /**
-   * Get the dump classes required for this migration test.
-   *
-   * @return array
-   *   The list of files containing dumps.
-   */
-  protected abstract function getDumps();
-
-  /**
    * Get the test classes that needs to be run for this test.
    *
    * @return array
@@ -73,14 +65,10 @@ protected function tearDown() {
     parent::tearDown();
   }
 
-
   /**
    * Test the complete Drupal migration.
    */
   public function testDrupal() {
-    $dumps = $this->getDumps();
-    $this->loadDumps($dumps);
-
     $classes = $this->getTestClassesList();
     foreach ($classes as $class) {
       if (is_subclass_of($class, '\Drupal\migrate\Tests\MigrateDumpAlterInterface')) {
diff --git a/core/modules/migrate_drupal/src/Tests/d6/MigrateDrupal6Test.php b/core/modules/migrate_drupal/src/Tests/d6/MigrateDrupal6Test.php
index fb4f0ea..9f3482c 100644
--- a/core/modules/migrate_drupal/src/Tests/d6/MigrateDrupal6Test.php
+++ b/core/modules/migrate_drupal/src/Tests/d6/MigrateDrupal6Test.php
@@ -209,52 +209,6 @@ protected function setUp() {
   }
 
   /**
-   * {@inheritdoc}
-   */
-  protected function getDumps() {
-    return array(
-      'AggregatorFeed.php',
-      'AggregatorItem.php',
-      'Blocks.php',
-      'BlocksRoles.php',
-      'Book.php',
-      'Boxes.php',
-      'Comments.php',
-      'Contact.php',
-      'ContentFieldMultivalue.php',
-      'ContentFieldTest.php',
-      'ContentFieldTestTwo.php',
-      'ContentNodeField.php',
-      'ContentNodeFieldInstance.php',
-      'ContentTypeStory.php',
-      'ContentTypeTestPlanet.php',
-      'EventTimezones.php',
-      'Files.php',
-      'FilterFormats.php',
-      'Filters.php',
-      'MenuCustom.php',
-      'MenuLinks.php',
-      'Node.php',
-      'NodeRevisions.php',
-      'NodeType.php',
-      'Permission.php',
-      'ProfileFields.php',
-      'ProfileValues.php',
-      'Role.php',
-      'TermData.php',
-      'TermHierarchy.php',
-      'TermNode.php',
-      'Upload.php',
-      'UrlAlias.php',
-      'Users.php',
-      'UsersRoles.php',
-      'Variable.php',
-      'Vocabulary.php',
-      'VocabularyNodeTypes.php',
-    );
-  }
-
-  /**
    * Returns the path to the dump directory.
    *
    * @return string
diff --git a/core/modules/migrate_drupal/src/Tests/dependencies/MigrateDependenciesTest.php b/core/modules/migrate_drupal/src/Tests/dependencies/MigrateDependenciesTest.php
index 81842c1..d4b3a53 100644
--- a/core/modules/migrate_drupal/src/Tests/dependencies/MigrateDependenciesTest.php
+++ b/core/modules/migrate_drupal/src/Tests/dependencies/MigrateDependenciesTest.php
@@ -55,7 +55,6 @@ public function testMigrateDependenciesOrder() {
   public function testAggregatorMigrateDependencies() {
     /** @var \Drupal\migrate\entity\Migration $migration */
     $migration = entity_load('migration', 'd6_aggregator_item');
-    $this->loadDumps(['AggregatorItem.php']);
     $executable = new MigrateExecutable($migration, $this);
     $this->startCollectingMessages();
     $executable->import();
diff --git a/core/modules/node/src/Tests/Migrate/d6/MigrateNodeBuilderTest.php b/core/modules/node/src/Tests/Migrate/d6/MigrateNodeBuilderTest.php
index 33625eb..d19061b 100644
--- a/core/modules/node/src/Tests/Migrate/d6/MigrateNodeBuilderTest.php
+++ b/core/modules/node/src/Tests/Migrate/d6/MigrateNodeBuilderTest.php
@@ -17,18 +17,6 @@ class MigrateNodeBuilderTest extends MigrateDrupal6TestBase {
   public static $modules = ['migrate', 'migrate_drupal', 'node'];
 
   /**
-   * {@inheritdoc}
-   */
-  public function setUp() {
-    parent::setUp();
-    $this->loadDumps([
-      'ContentNodeField.php',
-      'ContentNodeFieldInstance.php',
-      'NodeType.php',
-    ]);
-  }
-
-  /**
    * Tests creating migrations from a template, using a builder plugin.
    */
   public function testCreateMigrations() {
diff --git a/core/modules/node/src/Tests/Migrate/d6/MigrateNodeBundleSettingsTest.php b/core/modules/node/src/Tests/Migrate/d6/MigrateNodeBundleSettingsTest.php
index fc6e4e5..454040d 100644
--- a/core/modules/node/src/Tests/Migrate/d6/MigrateNodeBundleSettingsTest.php
+++ b/core/modules/node/src/Tests/Migrate/d6/MigrateNodeBundleSettingsTest.php
@@ -57,7 +57,6 @@ public function setUp() {
     );
     $this->prepareMigrations($id_mappings);
 
-    $this->loadDumps(['NodeType.php', 'Variable.php']);
     $this->executeMigration('d6_node_setting_promote');
     $this->executeMigration('d6_node_setting_status');
     $this->executeMigration('d6_node_setting_sticky');
diff --git a/core/modules/node/src/Tests/Migrate/d6/MigrateNodeConfigsTest.php b/core/modules/node/src/Tests/Migrate/d6/MigrateNodeConfigsTest.php
index 291c42a..af540f7 100644
--- a/core/modules/node/src/Tests/Migrate/d6/MigrateNodeConfigsTest.php
+++ b/core/modules/node/src/Tests/Migrate/d6/MigrateNodeConfigsTest.php
@@ -31,7 +31,6 @@ class MigrateNodeConfigsTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_node_settings');
   }
 
diff --git a/core/modules/node/src/Tests/Migrate/d6/MigrateNodeRevisionTest.php b/core/modules/node/src/Tests/Migrate/d6/MigrateNodeRevisionTest.php
index b10083e..27a5dcd 100644
--- a/core/modules/node/src/Tests/Migrate/d6/MigrateNodeRevisionTest.php
+++ b/core/modules/node/src/Tests/Migrate/d6/MigrateNodeRevisionTest.php
@@ -29,8 +29,6 @@ protected function setUp() {
     );
     $this->prepareMigrations($id_mappings);
 
-    $this->loadDumps(['Users.php']);
-
     // Create our users for the node authors.
     $query = Database::getConnection('default', 'migrate')->query('SELECT * FROM {users} WHERE uid NOT IN (0, 1)');
     while(($row = $query->fetchAssoc()) !== FALSE) {
diff --git a/core/modules/node/src/Tests/Migrate/d6/MigrateNodeTestBase.php b/core/modules/node/src/Tests/Migrate/d6/MigrateNodeTestBase.php
index f011a90..a47df1f 100644
--- a/core/modules/node/src/Tests/Migrate/d6/MigrateNodeTestBase.php
+++ b/core/modules/node/src/Tests/Migrate/d6/MigrateNodeTestBase.php
@@ -94,20 +94,6 @@ protected function setUp() {
     ));
     $node->enforceIsNew();
     $node->save();
-
-    $this->loadDumps([
-      'Node.php',
-      'NodeRevisions.php',
-      'ContentTypeStory.php',
-      'ContentTypeTestPlanet.php',
-      'NodeType.php',
-      'Variable.php',
-      'ContentNodeFieldInstance.php',
-      'ContentNodeField.php',
-      'ContentFieldTest.php',
-      'ContentFieldTestTwo.php',
-      'ContentFieldMultivalue.php',
-    ]);
   }
 
 }
diff --git a/core/modules/node/src/Tests/Migrate/d6/MigrateNodeTypeTest.php b/core/modules/node/src/Tests/Migrate/d6/MigrateNodeTypeTest.php
index 1ef267d..f7c5832 100644
--- a/core/modules/node/src/Tests/Migrate/d6/MigrateNodeTypeTest.php
+++ b/core/modules/node/src/Tests/Migrate/d6/MigrateNodeTypeTest.php
@@ -30,9 +30,7 @@ class MigrateNodeTypeTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-
     $this->installConfig(array('node'));
-    $this->loadDumps(['NodeType.php', 'Variable.php']);
     $this->executeMigration('d6_node_type');
   }
 
diff --git a/core/modules/node/src/Tests/Migrate/d6/MigrateViewModesTest.php b/core/modules/node/src/Tests/Migrate/d6/MigrateViewModesTest.php
index aa4337f..310a0c9 100644
--- a/core/modules/node/src/Tests/Migrate/d6/MigrateViewModesTest.php
+++ b/core/modules/node/src/Tests/Migrate/d6/MigrateViewModesTest.php
@@ -29,13 +29,6 @@ class MigrateViewModesTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps([
-      'ContentNodeFieldInstance.php',
-      'ContentNodeField.php',
-      'ContentFieldTest.php',
-      'ContentFieldTestTwo.php',
-      'ContentFieldMultivalue.php',
-    ]);
     $this->executeMigration('d6_view_modes');
   }
 
diff --git a/core/modules/path/src/Tests/Migrate/d6/MigrateUrlAliasTest.php b/core/modules/path/src/Tests/Migrate/d6/MigrateUrlAliasTest.php
index 200019c..bf08192 100644
--- a/core/modules/path/src/Tests/Migrate/d6/MigrateUrlAliasTest.php
+++ b/core/modules/path/src/Tests/Migrate/d6/MigrateUrlAliasTest.php
@@ -31,9 +31,7 @@ class MigrateUrlAliasTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-
     $this->installSchema('system', ['url_alias']);
-    $this->loadDumps(['UrlAlias.php']);
     $this->executeMigration('d6_url_alias');
   }
 
diff --git a/core/modules/search/src/Tests/Migrate/d6/MigrateSearchPageTest.php b/core/modules/search/src/Tests/Migrate/d6/MigrateSearchPageTest.php
index 81fc6e1..c330d2f 100644
--- a/core/modules/search/src/Tests/Migrate/d6/MigrateSearchPageTest.php
+++ b/core/modules/search/src/Tests/Migrate/d6/MigrateSearchPageTest.php
@@ -30,7 +30,6 @@ class MigrateSearchPageTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_search_page');
   }
 
diff --git a/core/modules/search/src/Tests/Migrate/d6/MigrateSearchSettingsTest.php b/core/modules/search/src/Tests/Migrate/d6/MigrateSearchSettingsTest.php
index 6b08fe5..d872d16 100644
--- a/core/modules/search/src/Tests/Migrate/d6/MigrateSearchSettingsTest.php
+++ b/core/modules/search/src/Tests/Migrate/d6/MigrateSearchSettingsTest.php
@@ -31,7 +31,6 @@ class MigrateSearchSettingsTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_search_settings');
   }
 
diff --git a/core/modules/search/src/Tests/Migrate/d7/MigrateSearchSettingsTest.php b/core/modules/search/src/Tests/Migrate/d7/MigrateSearchSettingsTest.php
index dc31d15..5adff41 100644
--- a/core/modules/search/src/Tests/Migrate/d7/MigrateSearchSettingsTest.php
+++ b/core/modules/search/src/Tests/Migrate/d7/MigrateSearchSettingsTest.php
@@ -23,7 +23,6 @@ class MigrateSearchSettingsTest extends MigrateDrupal7TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d7_search_settings');
   }
 
diff --git a/core/modules/simpletest/src/Tests/Migrate/d6/MigrateSimpletestConfigsTest.php b/core/modules/simpletest/src/Tests/Migrate/d6/MigrateSimpletestConfigsTest.php
index c44578d..43344dc 100644
--- a/core/modules/simpletest/src/Tests/Migrate/d6/MigrateSimpletestConfigsTest.php
+++ b/core/modules/simpletest/src/Tests/Migrate/d6/MigrateSimpletestConfigsTest.php
@@ -33,7 +33,6 @@ protected function setUp() {
     parent::setUp();
 
     $this->installConfig(['simpletest']);
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_simpletest_settings');
   }
 
diff --git a/core/modules/simpletest/src/Tests/Migrate/d7/MigrateSimpletestSettingsTest.php b/core/modules/simpletest/src/Tests/Migrate/d7/MigrateSimpletestSettingsTest.php
index 121c86c..0528cc1 100644
--- a/core/modules/simpletest/src/Tests/Migrate/d7/MigrateSimpletestSettingsTest.php
+++ b/core/modules/simpletest/src/Tests/Migrate/d7/MigrateSimpletestSettingsTest.php
@@ -24,7 +24,6 @@ class MigrateSimpletestSettingsTest extends MigrateDrupal7TestBase {
   protected function setUp() {
     parent::setUp();
     $this->installConfig(static::$modules);
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d7_simpletest_settings');
   }
 
diff --git a/core/modules/statistics/src/Tests/Migrate/d6/MigrateStatisticsConfigsTest.php b/core/modules/statistics/src/Tests/Migrate/d6/MigrateStatisticsConfigsTest.php
index ea0be9d..9a0a9d2 100644
--- a/core/modules/statistics/src/Tests/Migrate/d6/MigrateStatisticsConfigsTest.php
+++ b/core/modules/statistics/src/Tests/Migrate/d6/MigrateStatisticsConfigsTest.php
@@ -31,7 +31,6 @@ class MigrateStatisticsConfigsTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_statistics_settings');
   }
 
diff --git a/core/modules/syslog/src/Tests/Migrate/d6/MigrateSyslogConfigsTest.php b/core/modules/syslog/src/Tests/Migrate/d6/MigrateSyslogConfigsTest.php
index 19d9505..0ed8593 100644
--- a/core/modules/syslog/src/Tests/Migrate/d6/MigrateSyslogConfigsTest.php
+++ b/core/modules/syslog/src/Tests/Migrate/d6/MigrateSyslogConfigsTest.php
@@ -31,7 +31,6 @@ class MigrateSyslogConfigsTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_syslog_settings');
   }
 
diff --git a/core/modules/syslog/src/Tests/Migrate/d7/MigrateSyslogConfigsTest.php b/core/modules/syslog/src/Tests/Migrate/d7/MigrateSyslogConfigsTest.php
index 234a52f..f7ae205 100644
--- a/core/modules/syslog/src/Tests/Migrate/d7/MigrateSyslogConfigsTest.php
+++ b/core/modules/syslog/src/Tests/Migrate/d7/MigrateSyslogConfigsTest.php
@@ -32,7 +32,6 @@ class MigrateSyslogConfigsTest extends MigrateDrupal7TestBase {
   protected function setUp() {
     parent::setUp();
     $this->installConfig(static::$modules);
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d7_syslog_settings');
   }
 
diff --git a/core/modules/system/src/Tests/Migrate/d6/MigrateDateFormatTest.php b/core/modules/system/src/Tests/Migrate/d6/MigrateDateFormatTest.php
index c1d5c8f..8ba6c95 100644
--- a/core/modules/system/src/Tests/Migrate/d6/MigrateDateFormatTest.php
+++ b/core/modules/system/src/Tests/Migrate/d6/MigrateDateFormatTest.php
@@ -23,7 +23,6 @@ class MigrateDateFormatTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_date_formats');
   }
 
diff --git a/core/modules/system/src/Tests/Migrate/d6/MigrateMenuTest.php b/core/modules/system/src/Tests/Migrate/d6/MigrateMenuTest.php
index 279e2b7..b868f2a 100644
--- a/core/modules/system/src/Tests/Migrate/d6/MigrateMenuTest.php
+++ b/core/modules/system/src/Tests/Migrate/d6/MigrateMenuTest.php
@@ -24,7 +24,6 @@ class MigrateMenuTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['MenuCustom.php']);
     $this->executeMigration('d6_menu');
   }
 
diff --git a/core/modules/system/src/Tests/Migrate/d6/MigrateSystemCronTest.php b/core/modules/system/src/Tests/Migrate/d6/MigrateSystemCronTest.php
index c39f11e..77831b0 100644
--- a/core/modules/system/src/Tests/Migrate/d6/MigrateSystemCronTest.php
+++ b/core/modules/system/src/Tests/Migrate/d6/MigrateSystemCronTest.php
@@ -21,7 +21,6 @@ class MigrateSystemCronTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_system_cron');
   }
 
diff --git a/core/modules/system/src/Tests/Migrate/d6/MigrateSystemFileTest.php b/core/modules/system/src/Tests/Migrate/d6/MigrateSystemFileTest.php
index 9a9ff2a..6b7e0c2 100644
--- a/core/modules/system/src/Tests/Migrate/d6/MigrateSystemFileTest.php
+++ b/core/modules/system/src/Tests/Migrate/d6/MigrateSystemFileTest.php
@@ -21,7 +21,6 @@ class MigrateSystemFileTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_system_file');
   }
 
diff --git a/core/modules/system/src/Tests/Migrate/d6/MigrateSystemImageGdTest.php b/core/modules/system/src/Tests/Migrate/d6/MigrateSystemImageGdTest.php
index cdf9eae..57f30a4 100644
--- a/core/modules/system/src/Tests/Migrate/d6/MigrateSystemImageGdTest.php
+++ b/core/modules/system/src/Tests/Migrate/d6/MigrateSystemImageGdTest.php
@@ -21,7 +21,6 @@ class MigrateSystemImageGdTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_system_image_gd');
   }
 
diff --git a/core/modules/system/src/Tests/Migrate/d6/MigrateSystemImageTest.php b/core/modules/system/src/Tests/Migrate/d6/MigrateSystemImageTest.php
index e91e7cb..a2e5d80 100644
--- a/core/modules/system/src/Tests/Migrate/d6/MigrateSystemImageTest.php
+++ b/core/modules/system/src/Tests/Migrate/d6/MigrateSystemImageTest.php
@@ -21,7 +21,6 @@ class MigrateSystemImageTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_system_image');
   }
 
diff --git a/core/modules/system/src/Tests/Migrate/d6/MigrateSystemLoggingTest.php b/core/modules/system/src/Tests/Migrate/d6/MigrateSystemLoggingTest.php
index 963f58b..c352910 100644
--- a/core/modules/system/src/Tests/Migrate/d6/MigrateSystemLoggingTest.php
+++ b/core/modules/system/src/Tests/Migrate/d6/MigrateSystemLoggingTest.php
@@ -24,7 +24,6 @@ class MigrateSystemLoggingTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_system_logging');
   }
 
diff --git a/core/modules/system/src/Tests/Migrate/d6/MigrateSystemMaintenanceTest.php b/core/modules/system/src/Tests/Migrate/d6/MigrateSystemMaintenanceTest.php
index 581be5e..82ea483 100644
--- a/core/modules/system/src/Tests/Migrate/d6/MigrateSystemMaintenanceTest.php
+++ b/core/modules/system/src/Tests/Migrate/d6/MigrateSystemMaintenanceTest.php
@@ -21,7 +21,6 @@ class MigrateSystemMaintenanceTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_system_maintenance');
   }
 
diff --git a/core/modules/system/src/Tests/Migrate/d6/MigrateSystemPerformanceTest.php b/core/modules/system/src/Tests/Migrate/d6/MigrateSystemPerformanceTest.php
index 54e72fa..f6defe9 100644
--- a/core/modules/system/src/Tests/Migrate/d6/MigrateSystemPerformanceTest.php
+++ b/core/modules/system/src/Tests/Migrate/d6/MigrateSystemPerformanceTest.php
@@ -21,7 +21,6 @@ class MigrateSystemPerformanceTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_system_performance');
   }
 
diff --git a/core/modules/system/src/Tests/Migrate/d6/MigrateSystemRssTest.php b/core/modules/system/src/Tests/Migrate/d6/MigrateSystemRssTest.php
index 6295a56..21b04c2 100644
--- a/core/modules/system/src/Tests/Migrate/d6/MigrateSystemRssTest.php
+++ b/core/modules/system/src/Tests/Migrate/d6/MigrateSystemRssTest.php
@@ -21,7 +21,6 @@ class MigrateSystemRssTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_system_rss');
   }
 
diff --git a/core/modules/system/src/Tests/Migrate/d6/MigrateSystemSiteTest.php b/core/modules/system/src/Tests/Migrate/d6/MigrateSystemSiteTest.php
index 7591063..2b68764 100644
--- a/core/modules/system/src/Tests/Migrate/d6/MigrateSystemSiteTest.php
+++ b/core/modules/system/src/Tests/Migrate/d6/MigrateSystemSiteTest.php
@@ -21,7 +21,6 @@ class MigrateSystemSiteTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_system_site');
   }
 
diff --git a/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateTaxonomyConfigsTest.php b/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateTaxonomyConfigsTest.php
index 08b12a9..ef17ea6 100644
--- a/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateTaxonomyConfigsTest.php
+++ b/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateTaxonomyConfigsTest.php
@@ -31,7 +31,6 @@ class MigrateTaxonomyConfigsTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_taxonomy_settings');
   }
 
diff --git a/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateTaxonomyTermTest.php b/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateTaxonomyTermTest.php
index 8cf7560..eefcceb 100644
--- a/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateTaxonomyTermTest.php
+++ b/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateTaxonomyTermTest.php
@@ -33,12 +33,6 @@ protected function setUp() {
         array(array(2), array('vocabulary_2_i_1_')),
         array(array(3), array('vocabulary_3_i_2_')),
     )));
-    $this->loadDumps([
-      'TermData.php',
-      'TermHierarchy.php',
-      'Vocabulary.php',
-      'VocabularyNodeTypes.php',
-    ]);
     $this->executeMigration('d6_taxonomy_term');
   }
 
diff --git a/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateTaxonomyVocabularyTest.php b/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateTaxonomyVocabularyTest.php
index e199238..af2fdba 100644
--- a/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateTaxonomyVocabularyTest.php
+++ b/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateTaxonomyVocabularyTest.php
@@ -29,7 +29,6 @@ class MigrateTaxonomyVocabularyTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Vocabulary.php', 'VocabularyNodeTypes.php']);
     $this->executeMigration('d6_taxonomy_vocabulary');
   }
 
diff --git a/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateTermNodeTestBase.php b/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateTermNodeTestBase.php
index c54377b..0d51f64 100644
--- a/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateTermNodeTestBase.php
+++ b/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateTermNodeTestBase.php
@@ -82,17 +82,6 @@ protected function setUp() {
         $node->save();
       }
     }
-    $this->loadDumps([
-      'Node.php',
-      'NodeRevisions.php',
-      'ContentTypeStory.php',
-      'ContentTypeTestPlanet.php',
-      'TermNode.php',
-      'TermHierarchy.php',
-      'TermData.php',
-      'Vocabulary.php',
-      'VocabularyNodeTypes.php',
-    ]);
   }
 
 }
diff --git a/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateVocabularyEntityDisplayTest.php b/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateVocabularyEntityDisplayTest.php
index 5c266e6..bcf6b69 100644
--- a/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateVocabularyEntityDisplayTest.php
+++ b/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateVocabularyEntityDisplayTest.php
@@ -69,8 +69,6 @@ protected function setUp() {
       )
     );
     $this->prepareMigrations($id_mappings);
-
-    $this->loadDumps(['Vocabulary.php', 'VocabularyNodeTypes.php']);
     $this->executeMigration('d6_vocabulary_entity_display');
   }
 
diff --git a/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateVocabularyEntityFormDisplayTest.php b/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateVocabularyEntityFormDisplayTest.php
index 1691438..80efa09 100644
--- a/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateVocabularyEntityFormDisplayTest.php
+++ b/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateVocabularyEntityFormDisplayTest.php
@@ -69,8 +69,6 @@ protected function setUp() {
       )
     );
     $this->prepareMigrations($id_mappings);
-
-    $this->loadDumps(['Vocabulary.php', 'VocabularyNodeTypes.php']);
     $this->executeMigration('d6_vocabulary_entity_form_display');
   }
 
diff --git a/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateVocabularyFieldInstanceTest.php b/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateVocabularyFieldInstanceTest.php
index 0154063..f5c02ad 100644
--- a/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateVocabularyFieldInstanceTest.php
+++ b/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateVocabularyFieldInstanceTest.php
@@ -68,7 +68,6 @@ protected function setUp() {
       ),
     ))->save();
 
-    $this->loadDumps(['Vocabulary.php', 'VocabularyNodeTypes.php']);
     $this->executeMigration('d6_vocabulary_field_instance');
   }
 
diff --git a/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateVocabularyFieldTest.php b/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateVocabularyFieldTest.php
index 9859d59..0c588c8 100644
--- a/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateVocabularyFieldTest.php
+++ b/core/modules/taxonomy/src/Tests/Migrate/d6/MigrateVocabularyFieldTest.php
@@ -44,7 +44,6 @@ protected function setUp() {
       'vid' => 'test_vocab',
     ))->save();
 
-    $this->loadDumps(['Vocabulary.php', 'VocabularyNodeTypes.php']);
     $this->executeMigration('d6_vocabulary_field');
   }
 
diff --git a/core/modules/text/src/Tests/Migrate/d6/MigrateTextConfigsTest.php b/core/modules/text/src/Tests/Migrate/d6/MigrateTextConfigsTest.php
index 929d72d..440ffc0 100644
--- a/core/modules/text/src/Tests/Migrate/d6/MigrateTextConfigsTest.php
+++ b/core/modules/text/src/Tests/Migrate/d6/MigrateTextConfigsTest.php
@@ -31,7 +31,6 @@ class MigrateTextConfigsTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_text_settings');
   }
 
diff --git a/core/modules/tracker/src/Tests/Migrate/d7/MigrateTrackerSettingsTest.php b/core/modules/tracker/src/Tests/Migrate/d7/MigrateTrackerSettingsTest.php
index 3dd67b3..f37871e 100644
--- a/core/modules/tracker/src/Tests/Migrate/d7/MigrateTrackerSettingsTest.php
+++ b/core/modules/tracker/src/Tests/Migrate/d7/MigrateTrackerSettingsTest.php
@@ -24,7 +24,6 @@ class MigrateTrackerSettingsTest extends MigrateDrupal7TestBase {
   protected function setUp() {
     parent::setUp();
     $this->installConfig(['tracker']);
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d7_tracker_settings');
   }
 
diff --git a/core/modules/update/src/Tests/Migrate/d6/MigrateUpdateConfigsTest.php b/core/modules/update/src/Tests/Migrate/d6/MigrateUpdateConfigsTest.php
index 9cea4fc..fedf182 100644
--- a/core/modules/update/src/Tests/Migrate/d6/MigrateUpdateConfigsTest.php
+++ b/core/modules/update/src/Tests/Migrate/d6/MigrateUpdateConfigsTest.php
@@ -31,7 +31,6 @@ class MigrateUpdateConfigsTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_update_settings');
   }
 
diff --git a/core/modules/user/src/Tests/Migrate/ProfileValuesBuilderTest.php b/core/modules/user/src/Tests/Migrate/ProfileValuesBuilderTest.php
index a7f152d..747edc9 100644
--- a/core/modules/user/src/Tests/Migrate/ProfileValuesBuilderTest.php
+++ b/core/modules/user/src/Tests/Migrate/ProfileValuesBuilderTest.php
@@ -17,14 +17,6 @@ class ProfileValuesBuilderTest extends MigrateDrupal6TestBase {
   public static $modules = ['migrate', 'migrate_drupal', 'user'];
 
   /**
-   * {@inheritdoc}
-   */
-  protected function setUp() {
-    parent::setUp();
-    $this->loadDumps(['ProfileFields.php', 'ProfileValues.php']);
-  }
-
-  /**
    * Tests that profile fields are merged into the d6_profile_values migration's
    * process pipeline by the d6_profile_values builder.
    */
diff --git a/core/modules/user/src/Tests/Migrate/d6/MigrateUserConfigsTest.php b/core/modules/user/src/Tests/Migrate/d6/MigrateUserConfigsTest.php
index 9fa2bab..a087bbd 100644
--- a/core/modules/user/src/Tests/Migrate/d6/MigrateUserConfigsTest.php
+++ b/core/modules/user/src/Tests/Migrate/d6/MigrateUserConfigsTest.php
@@ -24,7 +24,6 @@ class MigrateUserConfigsTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps(['Variable.php']);
     $this->executeMigration('d6_user_mail');
     $this->executeMigration('d6_user_settings');
   }
diff --git a/core/modules/user/src/Tests/Migrate/d6/MigrateUserContactSettingsTest.php b/core/modules/user/src/Tests/Migrate/d6/MigrateUserContactSettingsTest.php
index 33637af..dec0153 100644
--- a/core/modules/user/src/Tests/Migrate/d6/MigrateUserContactSettingsTest.php
+++ b/core/modules/user/src/Tests/Migrate/d6/MigrateUserContactSettingsTest.php
@@ -29,13 +29,6 @@ protected function setUp() {
 
     $this->installSchema('user', array('users_data'));
 
-    $this->loadDumps([
-      'Users.php',
-      'ProfileValues.php',
-      'UsersRoles.php',
-      'EventTimezones.php',
-    ]);
-
     $id_mappings = array(
       'd6_user' => array(
         array(array(2), array(2)),
diff --git a/core/modules/user/src/Tests/Migrate/d6/MigrateUserPictureFileTest.php b/core/modules/user/src/Tests/Migrate/d6/MigrateUserPictureFileTest.php
index 650e6f2..54a8456 100644
--- a/core/modules/user/src/Tests/Migrate/d6/MigrateUserPictureFileTest.php
+++ b/core/modules/user/src/Tests/Migrate/d6/MigrateUserPictureFileTest.php
@@ -31,12 +31,6 @@ protected function setUp() {
     parent::setUp();
 
     $this->installEntitySchema('file');
-    $this->loadDumps([
-      'Users.php',
-      'ProfileValues.php',
-      'UsersRoles.php',
-      'EventTimezones.php',
-    ]);
 
     /** @var \Drupal\migrate\Entity\MigrationInterface $migration */
     $migration = entity_load('migration', 'd6_user_picture_file');
diff --git a/core/modules/user/src/Tests/Migrate/d6/MigrateUserProfileEntityDisplayTest.php b/core/modules/user/src/Tests/Migrate/d6/MigrateUserProfileEntityDisplayTest.php
index a1e9d16..059230f 100644
--- a/core/modules/user/src/Tests/Migrate/d6/MigrateUserProfileEntityDisplayTest.php
+++ b/core/modules/user/src/Tests/Migrate/d6/MigrateUserProfileEntityDisplayTest.php
@@ -73,14 +73,6 @@ protected function setUp() {
       'type' => 'boolean',
     ))->save();
 
-    $this->loadDumps([
-      'ProfileFields.php',
-      'Users.php',
-      'ProfileValues.php',
-      'UsersRoles.php',
-      'EventTimezones.php',
-    ]);
-
     $field_data = Database::getConnection('default', 'migrate')
       ->select('profile_fields', 'u')
       ->fields('u')
diff --git a/core/modules/user/src/Tests/Migrate/d6/MigrateUserProfileEntityFormDisplayTest.php b/core/modules/user/src/Tests/Migrate/d6/MigrateUserProfileEntityFormDisplayTest.php
index a863abe..0adb061 100644
--- a/core/modules/user/src/Tests/Migrate/d6/MigrateUserProfileEntityFormDisplayTest.php
+++ b/core/modules/user/src/Tests/Migrate/d6/MigrateUserProfileEntityFormDisplayTest.php
@@ -68,14 +68,6 @@ protected function setUp() {
       'type' => 'boolean',
     ))->save();
 
-    $this->loadDumps([
-      'ProfileFields.php',
-      'Users.php',
-      'ProfileValues.php',
-      'UsersRoles.php',
-      'EventTimezones.php',
-    ]);
-
     $field_data = Database::getConnection('default', 'migrate')
       ->select('profile_fields', 'u')
       ->fields('u')
diff --git a/core/modules/user/src/Tests/Migrate/d6/MigrateUserProfileFieldInstanceTest.php b/core/modules/user/src/Tests/Migrate/d6/MigrateUserProfileFieldInstanceTest.php
index 2b775ed..e4bbee1 100644
--- a/core/modules/user/src/Tests/Migrate/d6/MigrateUserProfileFieldInstanceTest.php
+++ b/core/modules/user/src/Tests/Migrate/d6/MigrateUserProfileFieldInstanceTest.php
@@ -32,13 +32,6 @@ protected function setUp() {
     );
     $this->prepareMigrations($id_mappings);
     $this->createFields();
-    $this->loadDumps(array(
-      'ProfileFields.php',
-      'Users.php',
-      'ProfileValues.php',
-      'UsersRoles.php',
-      'EventTimezones.php',
-    ));
     $this->executeMigration('d6_user_profile_field_instance');
   }
 
diff --git a/core/modules/user/src/Tests/Migrate/d6/MigrateUserProfileFieldTest.php b/core/modules/user/src/Tests/Migrate/d6/MigrateUserProfileFieldTest.php
index fd739ae..12bb0a2 100644
--- a/core/modules/user/src/Tests/Migrate/d6/MigrateUserProfileFieldTest.php
+++ b/core/modules/user/src/Tests/Migrate/d6/MigrateUserProfileFieldTest.php
@@ -24,13 +24,6 @@ class MigrateUserProfileFieldTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->loadDumps([
-      'ProfileFields.php',
-      'Users.php',
-      'ProfileValues.php',
-      'UsersRoles.php',
-      'EventTimezones.php',
-    ]);
     $this->executeMigration('d6_user_profile_field');
   }
 
diff --git a/core/modules/user/src/Tests/Migrate/d6/MigrateUserProfileValuesTest.php b/core/modules/user/src/Tests/Migrate/d6/MigrateUserProfileValuesTest.php
index 303013f..f07b919 100644
--- a/core/modules/user/src/Tests/Migrate/d6/MigrateUserProfileValuesTest.php
+++ b/core/modules/user/src/Tests/Migrate/d6/MigrateUserProfileValuesTest.php
@@ -105,14 +105,6 @@ protected function setUp() {
     );
     $this->prepareMigrations($id_mappings);
 
-    $this->loadDumps([
-      'ProfileFields.php',
-      'Users.php',
-      'ProfileValues.php',
-      'UsersRoles.php',
-      'EventTimezones.php',
-    ]);
-
     $field_data = Database::getConnection('default', 'migrate')
       ->select('profile_fields', 'u')
       ->fields('u')
diff --git a/core/modules/user/src/Tests/Migrate/d6/MigrateUserRoleTest.php b/core/modules/user/src/Tests/Migrate/d6/MigrateUserRoleTest.php
index 1d637e7..caf1ca9 100644
--- a/core/modules/user/src/Tests/Migrate/d6/MigrateUserRoleTest.php
+++ b/core/modules/user/src/Tests/Migrate/d6/MigrateUserRoleTest.php
@@ -37,14 +37,6 @@ protected function setUp() {
       ),
     );
     $this->prepareMigrations($id_mappings);
-
-    $this->loadDumps([
-      'Permission.php',
-      'Role.php',
-      'Filters.php',
-      'FilterFormats.php',
-      'Variable.php',
-    ]);
     $this->executeMigration('d6_user_role');
   }
 
diff --git a/core/modules/user/src/Tests/Migrate/d6/MigrateUserTest.php b/core/modules/user/src/Tests/Migrate/d6/MigrateUserTest.php
index dcc387c..7fa3236 100644
--- a/core/modules/user/src/Tests/Migrate/d6/MigrateUserTest.php
+++ b/core/modules/user/src/Tests/Migrate/d6/MigrateUserTest.php
@@ -87,19 +87,6 @@ protected function setUp() {
     file_put_contents($file->getFileUri(), file_get_contents('core/modules/simpletest/files/image-2.jpg'));
     $file->save();
 
-    $this->loadDumps([
-      'Filters.php',
-      'FilterFormats.php',
-      'Variable.php',
-      'ProfileFields.php',
-      'Permission.php',
-      'Role.php',
-      'Users.php',
-      'ProfileValues.php',
-      'UsersRoles.php',
-      'EventTimezones.php',
-    ]);
-
     $id_mappings = array(
       'd6_user_role' => array(
         array(array(1), array('anonymous user')),
