Fatal error: Uncaught Error: Class "Drupal\Tests\content_translation\Functional\ContentTranslationTestBase" not found in /home/www/drupal8/test/core/modules/content_translation/tests/src/Functional/ContentTranslationSyncImageTest.php:16 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/content_translation/tests/src/Functional/ContentTranslationSyncImageTest.php on line 16