Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /opt/lampp/htdocs/us/vendor/pion/laravel-chunk-upload/tests/Handler/ContentRangeUploadHandlerTest.php:12 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/us/vendor/pion/laravel-chunk-upload/tests/Handler/ContentRangeUploadHandlerTest.php on line 12