only in patch2:
unchanged:
--- a/core/modules/node/src/Tests/NodeFormButtonsTest.php
+++ b/core/modules/node/src/Tests/NodeFormButtonsTest.php
@@ -158,7 +158,7 @@ public function assertButtons($buttons, $dropbutton = TRUE) {
       $this->assertTrue(empty($save_button));
 
       // Dropbutton elements.
-      $elements = $this->xpath('//div[@class="dropbutton-wrapper"]//input[@type="submit"]');
+      $elements = $this->xpath('//div[@class="js-dropbutton-wrapper"]//input[@type="submit"]');
       $this->assertEqual($count, count($elements));
       foreach ($elements as $element) {
         $value = isset($element['value']) ? (string) $element['value'] : '';