Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in E:\www\xmvc\v5.0\composer\vendor\textalk\websocket\tests\ServerTest.php:16 Stack trace: #0 {main} thrown in E:\www\xmvc\v5.0\composer\vendor\textalk\websocket\tests\ServerTest.php on line 16