Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /var/www/html/ng-crm/yiiapp/vendor/ratchet/rfc6455/tests/unit/Handshake/ServerNegotiatorTest.php:10 Stack trace: #0 {main} thrown in /var/www/html/ng-crm/yiiapp/vendor/ratchet/rfc6455/tests/unit/Handshake/ServerNegotiatorTest.php on line 10