diff -u b/core/modules/system/tests/modules/ajax_test/ajax_test.module b/core/modules/system/tests/modules/ajax_test/ajax_test.module
--- b/core/modules/system/tests/modules/ajax_test/ajax_test.module
+++ b/core/modules/system/tests/modules/ajax_test/ajax_test.module
@@ -1,15 +1,13 @@
 <?php
 
-use Drupal\Core\Ajax\AjaxResponse;
-use Drupal\Core\Ajax\OpenModalDialogCommand;
-use Drupal\Core\Ajax\CloseDialogCommand;
-
 /**
  * @file
  * Helper module for Ajax framework tests.
  */
 
 use Drupal\Core\Ajax\AjaxResponse;
+use Drupal\Core\Ajax\OpenModalDialogCommand;
+use Drupal\Core\Ajax\CloseDialogCommand;
 use Drupal\Core\Ajax\HtmlCommand;
 
 /**