Fatal error: Uncaught Error: Class "Drupal\KernelTests\Core\Config\ConfigEntityValidationTestBase" not found in /home/qcsvlel/www/core/tests/Drupal/KernelTests/Core/Entity/EntityViewModeValidationTest.php:16 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/tests/Drupal/KernelTests/Core/Entity/EntityViewModeValidationTest.php on line 16