Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /var/www/html/w/vendor/league/oauth2-server/tests/Middleware/AuthorizationServerMiddlewareTest.php:21 Stack trace: #0 {main} thrown in /var/www/html/w/vendor/league/oauth2-server/tests/Middleware/AuthorizationServerMiddlewareTest.php on line 21