Fatal error: Uncaught Error: Class 'PHPUnit_Framework_TestCase' not found in /var/www/html/stz-api/vendor/ratchet/rfc6455/tests/unit/Messaging/MessageBufferTest.php:11 Stack trace: #0 {main} thrown in /var/www/html/stz-api/vendor/ratchet/rfc6455/tests/unit/Messaging/MessageBufferTest.php on line 11