Fatal error: Uncaught Error: Undefined constant "STDOUT" in /home/supratz/www/skyboard-refac/backend/tests/BoardInvariantCheckerTest.php:25 Stack trace: #0 /home/supratz/www/skyboard-refac/backend/tests/BoardInvariantCheckerTest.php(141): BoardInvariantCheckerTest->run() #1 {main} thrown in /home/supratz/www/skyboard-refac/backend/tests/BoardInvariantCheckerTest.php on line 25