Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/mohamed/education.mohamed-emad.com/vendor/symfony/process/Tests/ProcessWindowsEnvBlockTest.php:19 Stack trace: #0 {main} thrown in /home/mohamed/education.mohamed-emad.com/vendor/symfony/process/Tests/ProcessWindowsEnvBlockTest.php on line 19