Fatal error: Uncaught Error: Class "Drupal\views\Tests\ViewTestBase" not found in /home/www/drupal8/test/core/modules/views/src/Tests/Handler/HandlerTestBase.php:13 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/views/src/Tests/Handler/HandlerTestBase.php on line 13