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