Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/trialog/webhooks/vendor/teknoo/sellsy-client/tests/Sellsy/Client/AbstractClientTest.php:51 Stack trace: #0 {main} thrown in /home/trialog/webhooks/vendor/teknoo/sellsy-client/tests/Sellsy/Client/AbstractClientTest.php on line 51