Laravel 5.7: Phpunit testing, MethodNotAllowedHttpException

In Laravel 5.7 PHPUnit testing, I am getting MethodNotAllowedHttpException on post a request. I did not understand why.

I am using simple this method to send post request. $this->post('/path', ['body' => 'foobar']);

Please guide, How can I fix this issue.

via Chebli Mohamed