Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /lamp/www/quantix/vendor/ralouphie/getallheaders/tests/GetAllHeadersTest.php:7 Stack trace: #0 {main} thrown in /lamp/www/quantix/vendor/ralouphie/getallheaders/tests/GetAllHeadersTest.php on line 7