diff -u b/core/tests/Drupal/FunctionalJavascriptTests/Ajax/AjaxFormPageCacheTest.php b/core/tests/Drupal/FunctionalJavascriptTests/Ajax/AjaxFormPageCacheTest.php
--- b/core/tests/Drupal/FunctionalJavascriptTests/Ajax/AjaxFormPageCacheTest.php
+++ b/core/tests/Drupal/FunctionalJavascriptTests/Ajax/AjaxFormPageCacheTest.php
@@ -46,7 +46,6 @@
 
     // Changing the value of a select input element, triggers a AJAX
     // request/response.
-
     // The callback on the form responds with three AJAX command :-
     // - UpdateBuildIdCommand
     // - HtmlCommand