在对REST API运行npm测试时获取实际=未定义

Question

我正在使用node.js做一个RESTful api，

使用mocha，sinon，chai进行单元测试。

使用ibm DB2的数据库。

问题：

在上一篇文章here中，我询问了如何模拟pool.open(connString, function (err, db)。我已经修改了密码。现在我还有其他问题。

问题1：

我正在根据newsController.js对exports.getNews方法进行单元测试。那么在newsController.spec.js下，方法A是更正确的方法吗？基于我对类似Mockito的单元测试库如何在Java中工作的理解？

问题2：

使用方法A进行测试时，出现此错误消息。

 1) News service
       should list a SINGLE News /news/newsId GET:
     AssertError: expected value to match
    expected = {"result":[{"NEWS_ID":999,"TITLE":"TEST","NEWS_TYPE":"2","DESCRIPTION":"MAINTENANCE","CREATED_BY":"PETER","CREATED_DATE":"2018-08-20"}]}
    actual = undefined

当我设置了存根的返回值时，它怎么可能不确定？

问题3

我可以正确进行req.params.newsId测试吗？

代码：

这些是已经正确运行的文件。

newsRest.js：

module.exports = (app) => {

    const controller = require('../controller/newsController');

    app.route('news/:newsId').get(controller.getNews);

};

newsController.js：

'use strict';

//imports
var connectionString = require('../common/ibmdb2Pool').connectionString;
var connString = connectionString();

var initPool = require('../common/ibmdb2Pool').initPool;
var pool = initPool();

const query = require('../db/query');

/*
 * Restful API starts here
 * */

//get news by id

exports.getNews = (req, res) => {   

    //get from request
    const newsId = req.params.newsId;
    const params = [newsId];

    pool.open(connString, function (err, db) {
        if (err) {
            return console.log(err);
        }

        db.query(query.sqlSelect, params, function (error, result, info) {

            if (error) {
                console.log(error); 
                return false;
            }

            res.status(200).json({
                result: result
            });
        });
    });
};

ibmdb2Pool.js

'use strict';

//imports
require('dotenv').config();

var Pool = require("ibm_db").Pool;

// access the environment variables for this environment
var connString = process.env.CONNSTRING;

//variables
const minPoolSize = 20;
const maxPoolSize = 100;

//return connection string from environment file.
exports.connectionString = function () {
    return connString;
};

//init the db pool with a min and max size
exports.initPool = function () {
    var pool = new Pool();

    var ret = pool.init(minPoolSize, connString);

    if(ret !== true) {

        console.log("Cannot init pool. " + ret);
    }

    pool.setMaxPoolSize(maxPoolSize);

    return pool;
};

这是我的单元测试课：

newsController.spec.js

process.env.NODE_ENV = 'test';

var initPool = require('../common/ibmdb2Pool').initPool;
var pool = initPool();

const sinon = require('sinon');
const request = require('request');
const chai = require('chai');
const chaiHttp = require('chai-http');
const should = chai.should();
let server = require('../../../main.js');

chai.use(chaiHttp);
var poolMock;

describe('news service', () => {
    const req = httpMocks.createRequest();
    var res = httpMocks.createResponse();
    var param;
        beforeEach(() => {

            param = sinon.spy(req, 'param');

            poolMock = sinon.stub(pool, 'open').callsArgWith(
                1, // argument position
                null, // 1st callback argument
                { success: true } // 2d cb argument
            );

            poolMock.returns(
                JSON.stringify(announcements.single.success.body));

            });
        });

        afterEach(() => {
            poolMock.restore();
            param.restore();
        });

        it('should list a SINGLE news /news/newsId GET', (done) => {

            //Method A
            req.params.newsId = 999;
            var result = controller.getNews(req, res);
            sinon.assert.match(req.params.newsId, 999);

            sinon.assert.match(result, 
                JSON.stringify(news.single.success.body));

            //Method B
            chai.request(server) 
                .get('/news/999')
                .end(function(err, res){
                    res.should.have.status(200);
                    res.should.be.json;
                    res.body.should.be.a('object');                                 
                    res.body.result.should.include.keys(
                            'NEWS_ID', 'TITLE', 'NEWS_TYPE', 'DESCRIPTION', 'CREATED_BY', 'CREATED_DATE'
                          );
                   done();
               })
        });
});