Drupal test run --------------- All tests will run. Test run started: Wednesday, April 29, 2015 - 21:12 Test summary ------------ Drupal\config\Tests\ConfigFormOverrideTest 16 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 'simpletest350141' for test ID 1450. [29-Apr-2015 21:32:22 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. Drupal\update\Tests\UpdateContribTest 174 passes 16 fails Test run duration: 25 min 19 sec