Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/mohamed/education.mohamed-emad.com/vendor/zircote/swagger-php/tests/Augmenter/RefsTest.php:16 Stack trace: #0 {main} thrown in /home/mohamed/education.mohamed-emad.com/vendor/zircote/swagger-php/tests/Augmenter/RefsTest.php on line 16