code: def test_handle_error_401_no_challenge_by_default(self, api):
      resp = api.handle_error(Unauthorized())
      assert resp.status_code == 401
      assert "WWW-Autheneticate" not in resp.headers
  
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 4 for calling the APITest obj's underlying member method code with example usage: obj.test_handle_error_401_no_challenge_by_default(api) without return types