Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in D:\xampp\htdocs\help.cagpro.cloud\vendor\ratchet\rfc6455\tests\unit\Messaging\MessageBufferTest.php:12 Stack trace: #0 {main} thrown in D:\xampp\htdocs\help.cagpro.cloud\vendor\ratchet\rfc6455\tests\unit\Messaging\MessageBufferTest.php on line 12