Chai断言不会因request命令而失败

Question

我正在尝试检查从http请求返回的响应代码，但是下面的assert语句始终在传递。最后的陈述 Expect（response.statusCode）应该失败并不确定出什么问题。这是我第一次使用mocha和chai框架进行测试。

const expect = require('chai').expect;
const mocha = require('mocha')
var request = require("request");
var should = require('chai').should();
const assert = require('assert');


var options = { method: 'POST',
  url: 'https://technology.com.au/ing/api/v2/auth',
  headers: 
   { 'Content-Type': 'application/json',
     'xapi-version': '1' },
  body: 
   { application: 'ERD',
     username: 'GerSP',
     password: '1234' },
  json: true };


describe('Login Test' , function () {
    it('should fail', function () {

        request(options, function (error, response, body) {
            if (error) throw new Error(error);
                //console.log(body);
            }).on('response', function(response) {              
                response.on('data', function(data) {
                    console.log('response .. ' + response.statusCode)



                    // Its suppose to fail

                    **expect(response.statusCode).to.equal(601);**
                });
        });      
    });
  })