Fatal error: Uncaught Error: Class "Drupal\Tests\settings_tray\FunctionalJavascript\SettingsTrayTestBase" not found in /home/www/drupal8/test/core/modules/settings_tray/tests/src/FunctionalJavascript/OverriddenConfigurationTest.php:14 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/settings_tray/tests/src/FunctionalJavascript/OverriddenConfigurationTest.php on line 14