Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\gen\ms_core\DiscordApi\vendor\ratchet\rfc6455\tests\unit\Messaging\MessageBufferTest.php:12 Stack trace: #0 {main} thrown in C:\gen\ms_core\DiscordApi\vendor\ratchet\rfc6455\tests\unit\Messaging\MessageBufferTest.php on line 12