Fatal error: Uncaught Error: Class 'Ratchet\AbstractMessageComponentTestCase' not found in /home/soh-works/www/websoket-sample/vendor/cboden/ratchet/tests/unit/Session/SessionComponentTest.php:12 Stack trace: #0 {main} thrown in /home/soh-works/www/websoket-sample/vendor/cboden/ratchet/tests/unit/Session/SessionComponentTest.php on line 12