Fatal error: Uncaught Error: Class "Drupal\Core\Database\Connection" not found in /home/qcsvlel/www/core/tests/Drupal/Tests/Core/Database/Stub/StubConnection.php:18 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/tests/Drupal/Tests/Core/Database/Stub/StubConnection.php on line 18