code: def test_api_representation(self, api):
      @api.representation("foo")
      def foo():
          pass
  
      assert api.representations["foo"] == foo
  
imports: from __future__ import unicode_literals
  import flask
  import pytest
  import six
  from json import dumps, JSONEncoder
  from flask import Blueprint, redirect, views
  from werkzeug.exceptions import HTTPException, Unauthorized, BadRequest
  import flask_restplus
label_desc: Use image node_id 8 for calling the APITest obj's underlying member method code with example usage: obj.test_api_representation(api) without return types