Fatal error: Uncaught Error: Class 'Drupal\FunctionalJavascriptTests\WebDriverTestBase' not found in /var/www/html/tmp/contrib/flag/tests/src/FunctionalJavascript/ModalFormTest.php:14 Stack trace: #0 {main} thrown in /var/www/html/tmp/contrib/flag/tests/src/FunctionalJavascript/ModalFormTest.php on line 14