Fatal error: Uncaught Error: Class "Drupal\Core\Database\Driver\mysql\Select" not found in /home/www/drupal8/test/core/tests/Drupal/Tests/Core/Database/Stub/Select.php:7 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/tests/Drupal/Tests/Core/Database/Stub/Select.php on line 7