Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /opt/lampp/htdocs/vendor/symfony/psr-http-message-bridge/Tests/EventListener/PsrResponseListenerTest.php:24 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/vendor/symfony/psr-http-message-bridge/Tests/EventListener/PsrResponseListenerTest.php on line 24