node.js - 使用 redis-mock 进行 Nodejs 单元测试导致 ECONNREFUSED

Question

我目前在 NodeJS 中有一个类，它将在实例化时创建一个 Redis 客户端。我正在尝试编写一个单元测试来测试这个类。但是，我不确定是否能让主要代码与单元测试中的 redis-mock 一起使用。

在单元测试过程中，这行代码返回了 redis.createClient(config.get('redis.port'), config.get('redis.ip')); -> 连接ECONNREFUSED

class Socket {

    constructor(socketClient) {

        /** For socket io */
        this.socketClient = socketClient;
        log.info("new socketio client connected... " + socketClient.id);        
        
        /** For redis */
        // a redis client is created and connects
        this.redisClient = redis.createClient(config.get('redis.port'), config.get('redis.ip'));

        this.redisClient.on('connect', function() {
            log.info('Redis client connected ' + socketClient.id);
        });
        this.redisClient.on('error', function (err) {
            log.error('Redis client something went wrong ' + err);
        });
        this.redisClient.on('message', function (channel, message) {
            log.info('Redis message received...' + socketClient.id + " socketio emitting to " + channel + ": " + message);
            socketClient.emit('updatemessage', message)
        });
    }

}

这是单元测试代码:

'use strict'

var expect = require('chai').expect
  , server = require('../index')
  , redis = require('redis-mock')
  , redisClient
  , io = require('socket.io-client')
  , ioOptions = { 
      transports: ['websocket']
    , forceNew: true
    , reconnection: false
  }
  , testMsg = JSON.stringify({message: 'HelloWorld'})
  , sender
  , receiver
  



describe('Chat Events', function(){
  beforeEach(function(done){
    
    redisClient = redis.createClient();
    // start the io server
    //server.start()
    // connect two io clients
    sender = io('http://localhost:3000/', ioOptions)
    receiver = io('http://localhost:3000/', ioOptions)
    
    // finish beforeEach setup
    done()
  })
  afterEach(function(done){
    
    redisClient.disconnect
    // disconnect io clients after each test
    sender.disconnect()
    receiver.disconnect()
    done()
  })

  describe('Message Events', function(){
    it('Clients should receive a message when the `message` event is emited.', function(done){
      sender.emit('message', testMsg)
      receiver.on('ackmessage', function(msg){
        expect(msg).to.contains(testMsg)
        done()
      })
    })
  })
})

Answer 1

虽然您从 redis-mock 库导入 redis，但它不会自动使用它创建 Sockets lib(以及 redisClient用它创建的)在引擎盖下。相反，它继续依赖“正常”redis 模块。

要实现该效果，请尝试在顶部添加一行:

jest.mock('redis', () => redis)

在您需要redis-mock之后。