Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/alkhalaffamily/public_html/felhal/vendor/sebastian/type/tests/unit/NullTypeTest.php:17 Stack trace: #0 {main} thrown in /home/alkhalaffamily/public_html/felhal/vendor/sebastian/type/tests/unit/NullTypeTest.php on line 17