Fatal error: Uncaught Error: Class "Drupal\FunctionalJavascriptTests\WebDriverTestBase" not found in /home/qcsvlel/www/core/modules/media_library/tests/src/FunctionalJavascript/TranslationsTest.php:21 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/media_library/tests/src/FunctionalJavascript/TranslationsTest.php on line 21