Fatal error: Uncaught Error: Class "Drupal\Tests\tour\Functional\TourTestBase" not found in /home/www/drupal8/test/core/modules/views_ui/tests/src/Functional/ViewsUITourTest.php:13 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/views_ui/tests/src/Functional/ViewsUITourTest.php on line 13