Fatal error: Uncaught Error: Class "Drupal\FunctionalJavascriptTests\JavascriptTestBase" not found in /home/www/drupal8/test/core/tests/Drupal/FunctionalJavascriptTests/LegacyJavascriptTestBase.php:13 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/tests/Drupal/FunctionalJavascriptTests/LegacyJavascriptTestBase.php on line 13