Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /opt/lampp/htdocs/msjframework/vendor/laravel/framework/src/Illuminate/Foundation/Testing/TestCase.php:9 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/msjframework/vendor/laravel/framework/src/Illuminate/Foundation/Testing/TestCase.php on line 9