Fatal error: Uncaught Error: Class "Drupal\Tests\user\Functional\Rest\RoleResourceTestBase" not found in /home/www/drupal8/test/core/modules/rest/tests/src/Functional/EntityResource/Role/RoleResourceTestBase.php:15 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/rest/tests/src/Functional/EntityResource/Role/RoleResourceTestBase.php on line 15