Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\www\zdxnew\web\vendor\apimatic\core\tests\ClientTest.php:25 Stack trace: #0 {main} thrown in C:\xampp\htdocs\www\zdxnew\web\vendor\apimatic\core\tests\ClientTest.php on line 25