diff -u b/core/tests/Drupal/Tests/Core/Form/FormElementHelperTest.php b/core/tests/Drupal/Tests/Core/Form/FormElementHelperTest.php
--- b/core/tests/Drupal/Tests/Core/Form/FormElementHelperTest.php
+++ b/core/tests/Drupal/Tests/Core/Form/FormElementHelperTest.php
@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Contains \Drupal\Tests\Core\Form\FormBuilderTest.
+ * Contains \Drupal\Tests\Core\Form\FormElementHelperTest.
  */
 
 namespace Drupal\Tests\Core\Form;
only in patch2:
unchanged:
--- a/core/modules/content_translation/src/Tests/ContentTranslationUITestBase.php
+++ b/core/modules/content_translation/src/Tests/ContentTranslationUITestBase.php
@@ -242,7 +242,7 @@ protected function doTestAuthoringInfo() {
       'content_translation[created]' => '19/11/1978',
     );
     $this->drupalPostForm($entity->urlInfo('edit-form'), $edit, $this->getFormSubmitAction($entity, $langcode));
-    $this->assertTrue($this->xpath('//div[contains(@class, "error")]//ul'), 'Invalid values generate a list of form errors.');
+    $this->assertTrue($this->xpath('//div[contains(concat(" ", normalize-space(@class), " "), :class)]', array(':class' => ' messages--error ')), 'Invalid values generate a form error message.');
     $metadata = $this->manager->getTranslationMetadata($entity->getTranslation($langcode));
     $this->assertEqual($metadata->getAuthor()->id(), $values[$langcode]['uid'], 'Translation author correctly kept.');
     $this->assertEqual($metadata->getCreatedTime(), $values[$langcode]['created'], 'Translation date correctly kept.');