Fatal error: Uncaught Error: Class "Drupal\Tests\tour\Functional\TourTestBase" not found in /home/www/drupal8/test/core/modules/tour/tests/src/Functional/TourTestBasic.php:8 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/tour/tests/src/Functional/TourTestBasic.php on line 8