Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\public\vendor\apimatic\unirest-php\tests\Unirest\ResponseTest.php:10 Stack trace: #0 {main} thrown in C:\xampp\htdocs\public\vendor\apimatic\unirest-php\tests\Unirest\ResponseTest.php on line 10