Fatal error: Uncaught Error: Class "Drupal\Tests\shortcut\Functional\ShortcutTestBase" not found in /home/www/drupal8/test/core/modules/shortcut/tests/src/Functional/ShortcutLinksTest.php:18 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/shortcut/tests/src/Functional/ShortcutLinksTest.php on line 18