Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /var/www/html/w/vendor/league/oauth2-server/tests/Grant/ClientCredentialsGrantTest.php:20 Stack trace: #0 {main} thrown in /var/www/html/w/vendor/league/oauth2-server/tests/Grant/ClientCredentialsGrantTest.php on line 20