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