Fatal error: Uncaught Error: Class "Drupal\Tests\user\Functional\Views\UserTestBase" not found in /home/www/drupal8/test/core/modules/user/tests/src/Functional/Views/HandlerFieldRoleTest.php:14 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/user/tests/src/Functional/Views/HandlerFieldRoleTest.php on line 14