Fatal error: Uncaught Error: Class "Drupal\Core\Entity\ContentEntityBase" not found in /home/www/drupal8/test/core/modules/language/tests/language_test/src/Entity/NoLanguageEntityTest.php:26 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/language/tests/language_test/src/Entity/NoLanguageEntityTest.php on line 26