Fatal error: Uncaught Error: Class "Drupal\Tests\Component\DependencyInjection\Dumper\OptimizedPhpArrayDumperTest" not found in /home/www/drupal8/test/core/tests/Drupal/Tests/Component/DependencyInjection/Dumper/PhpArrayDumperTest.php:11 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/tests/Drupal/Tests/Component/DependencyInjection/Dumper/PhpArrayDumperTest.php on line 11