Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\cms-propay\vendor\ratchet\pawl\tests\unit\ConnectorTest.php:9 Stack trace: #0 {main} thrown in C:\xampp\htdocs\cms-propay\vendor\ratchet\pawl\tests\unit\ConnectorTest.php on line 9