Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\www\zdxnew\web\vendor\apimatic\unirest-php\tests\RequestTest.php:14 Stack trace: #0 {main} thrown in C:\xampp\htdocs\www\zdxnew\web\vendor\apimatic\unirest-php\tests\RequestTest.php on line 14