Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/vtsnised/public_html/anketa2.0/vendor/sebastian/environment/tests/OperatingSystemTest.php:17 Stack trace: #0 {main} thrown in /home/vtsnised/public_html/anketa2.0/vendor/sebastian/environment/tests/OperatingSystemTest.php on line 17