Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /var/www/html/API_Forum/vendor/willdurand/negotiation/tests/Negotiation/Tests/TestCase.php:7 Stack trace: #0 {main} thrown in /var/www/html/API_Forum/vendor/willdurand/negotiation/tests/Negotiation/Tests/TestCase.php on line 7