Fatal error: Uncaught Error: Class "Drupal\FunctionalJavascriptTests\WebDriverTestBase" not found in /home/qcsvlel/www/core/modules/media_library/tests/src/FunctionalJavascript/EmbeddedFormWidgetTest.php:18 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/media_library/tests/src/FunctionalJavascript/EmbeddedFormWidgetTest.php on line 18