Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /Applications/XAMPP/xamppfiles/htdocs/Project_April/sp-api/test/AuthorizationSignerTest.php:11 Stack trace: #0 {main} thrown in /Applications/XAMPP/xamppfiles/htdocs/Project_April/sp-api/test/AuthorizationSignerTest.php on line 11