Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/kubalos2/public_html/testtestowy/vendor/symfony/http-foundation/Tests/HeaderUtilsTest.php:17 Stack trace: #0 {main} thrown in /home/kubalos2/public_html/testtestowy/vendor/symfony/http-foundation/Tests/HeaderUtilsTest.php on line 17