如何在mocha框架中更正此测试用例？(How to correct this test case in mocha framework?)

 我正在尝试为节点应用程序编写测试用例，它使用mocha作为测试框架。 
 
 test.js 
 
var register = require('../routes/users');
var request = require('request');
var baseUrl = 'http://localhost:5000';

describe('registerUser()', function() {

    it('check email is already registered', function (done) {
        request.post({uri:baseUrl+'/register', form :{
            username: 'test',
            email: 'test@test.com'
        }}, function (e, res, body) {
            res.should.have.property('statusCode', 201);
            res.should.have.property('regErr', 'This email is already taken!');
        })
    });

})
 
 regErr作为render函数registerUser参数给出。 我期望参数regErr将被设置为响应的属性并且可以进入测试。 请检查我在github中的registerUser函数 。 我正在尝试为此功能创建一个测试用例。 
 
 上面的代码在测试用例中获取的响应中没有名为regErr属性。 
 
 如何更正渲染参数也可以作为响应属性？ 
 
 我需要更改实际的函数registerUser才能得到这个吗？ 如果是这样，我怎样才能实现这一目标？ 

I am trying to write test case for node application, which is using mocha as test framework. 
 
test.js
 
var register = require('../routes/users');
var request = require('request');
var baseUrl = 'http://localhost:5000';

describe('registerUser()', function() {

    it('check email is already registered', function (done) {
        request.post({uri:baseUrl+'/register', form :{
            username: 'test',
            email: 'test@test.com'
        }}, function (e, res, body) {
            res.should.have.property('statusCode', 201);
            res.should.have.property('regErr', 'This email is already taken!');
        })
    });

})
 
The regErr is given as parameter in function registerUser on render. I expected the parameterregErr will be set as property of response and can be get in test. Please check my registerUser function in github. I am trying create a test case for this function.
 
Above code doesn't have property called regErr in response fetched in test case.
 
How to correct so that the rendering parameters can also be property in response?
 
Shall I need to change the actual function registerUser to get this? If so, how can I achieve this?

原文：https://stackoverflow.com/questions/15811297