Fatal error: Uncaught Error: Class "Drupal\KernelTests\Core\Entity\EntityKernelTestBase" not found in /home/qcsvlel/www/core/modules/layout_builder/tests/src/Kernel/LayoutBuilderBreadcrumbAlterTest.php:17 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/layout_builder/tests/src/Kernel/LayoutBuilderBreadcrumbAlterTest.php on line 17