Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /var/www/development/pixtask/vendor/laravel/lumen-framework/src/Testing/TestCase.php:13 Stack trace: #0 {main} thrown in /var/www/development/pixtask/vendor/laravel/lumen-framework/src/Testing/TestCase.php on line 13