Fatal error: Uncaught Error: Class "Drupal\KernelTests\Core\Entity\EntityKernelTestBase" not found in /home/qcsvlel/www/core/modules/editor/tests/src/Kernel/EditorFileUsageTest.php:22 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/editor/tests/src/Kernel/EditorFileUsageTest.php on line 22