Fatal error: Uncaught Error: Class "Drupal\Core\Config\Entity\ConfigEntityBase" not found in /home/www/drupal8/test/core/modules/config/tests/config_test/src/Entity/ConfigTest.php:40 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/config/tests/config_test/src/Entity/ConfigTest.php on line 40