Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/devypfrfhn/https.sc/vendor/league/oauth1-client/tests/ClientCredentialsTest.php:9 Stack trace: #0 {main} thrown in /home/devypfrfhn/https.sc/vendor/league/oauth1-client/tests/ClientCredentialsTest.php on line 9