Drupal test run --------------- All tests will run. Test run started: Monday, April 20, 2015 - 23:20 Test summary ------------ Drupal\comment\Tests\CommentPreviewTest 117 passes 2 fails Fatal error: Cannot use 'Null' as class name as it is reserved in /home/berdir/Projekte/d8/core/vendor/symfony/validator/Symfony/Component/Validator/Constraints/Null.php on line 24 FATAL Drupal\system\Tests\TypedData\TypedDataTest: test runner returned a non-zero error code (255). - Found database prefix 'simpletest382910' for test ID 1535. [20-Apr-2015 23:40:22 UTC] PHP Fatal error: Cannot use 'Null' as class name as it is reserved in /home/berdir/Projekte/d8/core/vendor/symfony/validator/Symfony/Component/Validator/Constraints/Null.php on line 24 - Removed test site directory. - Removed 2 leftover tables. Test run duration: 24 min 51 sec