Fatal error: Uncaught Error: Class 'Ratchet\AbstractMessageComponentTestCase' not found in /home/soh-works/www/websoket-sample/vendor/cboden/ratchet/tests/unit/Http/HttpServerTest.php:8 Stack trace: #0 {main} thrown in /home/soh-works/www/websoket-sample/vendor/cboden/ratchet/tests/unit/Http/HttpServerTest.php on line 8