Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/app/htdocs/v2.2.3/vendor/dasprid/enum/test/NullValueTest.php:12 Stack trace: #0 {main} thrown in /home/app/htdocs/v2.2.3/vendor/dasprid/enum/test/NullValueTest.php on line 12