Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /data/htmlwww/laravel-system/vendor/intervention/image/tests/PolygonCommandTest.php:6 Stack trace: #0 {main} thrown in /data/htmlwww/laravel-system/vendor/intervention/image/tests/PolygonCommandTest.php on line 6