Fatal error: Uncaught Error: Class "Drupal\Core\Database\Database" not found in /home/www/drupal8/test/core/modules/migrate_drupal/tests/fixtures/drupal6.php:12 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/migrate_drupal/tests/fixtures/drupal6.php on line 12