Test to see if the request is a POST, has JSON data in the body and expecting JSON in the response.
Test to see if the request is a POST, has JSON data in the body and expecting JSON in the response. The path, JSON Data and the Req instance are extracted.
A trait that defines the TestPost extractor. Is the request a POST, has JSON or XML data in the post body and something that expects JSON or XML in the response. Subclass this trait to change the behavior