Fatal error: Uncaught Error: Class "Drupal\Tests\tracker\Functional\Views\TrackerTestBase" not found in /home/www/drupal8/test/core/modules/tracker/tests/src/Functional/Views/TrackerUserUidTest.php:12 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/tracker/tests/src/Functional/Views/TrackerUserUidTest.php on line 12