Fatal error: Uncaught Error: Class 'PHPUnit_Framework_TestCase' not found in /home/edmedu/www/edmtw.com/dev/vendor/nicmart/tree/tests/Visitor/PreOrderVisitorTest.php:8 Stack trace: #0 {main} thrown in /home/edmedu/www/edmtw.com/dev/vendor/nicmart/tree/tests/Visitor/PreOrderVisitorTest.php on line 8