Fatal error: Uncaught Error: Class "Drupal\Tests\views\Kernel\ViewsKernelTestBase" not found in /home/www/drupal8/test/core/modules/field/tests/src/Kernel/EntityReference/Views/EntityReferenceRelationshipTest.php:21 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/field/tests/src/Kernel/EntityReference/Views/EntityReferenceRelationshipTest.php on line 21