Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /var/www/html/usophy/vendor/laravel/framework/src/Illuminate/Foundation/Testing/TestCase.php:18 Stack trace: #0 {main} thrown in /var/www/html/usophy/vendor/laravel/framework/src/Illuminate/Foundation/Testing/TestCase.php on line 18