Fatal error: Uncaught Error: Class "Drupal\KernelTests\Core\Entity\EntityKernelTestBase" not found in /home/www/drupal8/test/core/tests/Drupal/KernelTests/Core/Entity/EntityCrudHookTest.php:34
Stack trace:
#0 {main}
thrown in /home/www/drupal8/test/core/tests/Drupal/KernelTests/Core/Entity/EntityCrudHookTest.php on line 34