Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/wittyly/public_html/live/hr-witty/vendor/sebastian/environment/tests/RuntimeTest.php:17 Stack trace: #0 {main} thrown in /home/wittyly/public_html/live/hr-witty/vendor/sebastian/environment/tests/RuntimeTest.php on line 17