Fatal error: Uncaught Error: Class "Drupal\KernelTests\Core\Entity\EntityKernelTestBase" not found in /home/qcsvlel/www/core/modules/field/tests/src/Kernel/EntityReference/EntityReferenceFormatterTest.php:26 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/field/tests/src/Kernel/EntityReference/EntityReferenceFormatterTest.php on line 26