diff --git a/core/modules/system/tests/modules/ajax_test/js/insert-ajax.js b/core/modules/system/tests/modules/ajax_test/js/insert-ajax.js
index c261bca..6088b2d 100644
--- a/core/modules/system/tests/modules/ajax_test/js/insert-ajax.js
+++ b/core/modules/system/tests/modules/ajax_test/js/insert-ajax.js
@@ -28,7 +28,9 @@
           wrapper: 'ajax-target-inline',
           base: false,
           element: false,
-          method: event.currentTarget.getAttribute('data-method')
+          method: event.currentTarget.getAttribute('data-method'),
+          effect: 'slide',
+          speed: 5000
         };
         var myAjaxObject = Drupal.ajax(ajaxSettings);
         myAjaxObject.execute();