Fatal error: Uncaught Error: Class "Drupal\Tests\BrowserTestBase" not found in /home/qcsvlel/www/core/modules/media/tests/src/Functional/MediaFunctionalTestBase.php:13 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/media/tests/src/Functional/MediaFunctionalTestBase.php on line 13