Fatal error: Uncaught Error: Class "Drupal\Tests\Core\Routing\UrlGeneratorTest" not found in /home/www/drupal8/test/core/tests/Drupal/Tests/Core/Render/MetadataBubblingUrlGeneratorTest.php:16 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/tests/Drupal/Tests/Core/Render/MetadataBubblingUrlGeneratorTest.php on line 16