Fatal error: Uncaught Error: Class "Drupal\Tests\jsonapi\Functional\ResourceTestBase" not found in /home/qcsvlel/www/core/modules/jsonapi/tests/src/Functional/MediaTest.php:21 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/jsonapi/tests/src/Functional/MediaTest.php on line 21