Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/demo4ev/public_html/RAUSHAN/vendor/apimatic/core/tests/AuthenticationTest.php:13 Stack trace: #0 {main} thrown in /home/demo4ev/public_html/RAUSHAN/vendor/apimatic/core/tests/AuthenticationTest.php on line 13