Fatal error: Uncaught Error: Class "Drupal\Tests\rdf\Functional\Rest\RdfMappingResourceTestBase" not found in /home/www/drupal8/test/core/modules/rdf/tests/src/Functional/Hal/RdfMappingHalJsonCookieTest.php:11 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/rdf/tests/src/Functional/Hal/RdfMappingHalJsonCookieTest.php on line 11