嘲笑用于MEAN应用程序单元测试的MongoDB连接(Mocking MongoDB connection for MEAN application unit testing)

 我一直在绞尽脑汁，试图找出一种方法来处理我的单元测试MongoDB连接。 我想知道做什么适当的方法是因为我的应用程序布局可能是问题。 这是针对包含大量模块的较大项目。 
 
 总体布局 
 
 package.json
 server.js
-models
    -index.js
    -users.js
    -events.js
    -...
-services
    -index.js
    -userActivity.js
    -...
 +public
+routes
+util
+test
 
 车型/ users.js 
 
"use strict";
modules.export = function(mongoose) {
  var Schema = mongoose.Schema;
  var userSchema = new Schema({ name: String });
  var userModel = mongoose.model('User', userSchema);
  var userDAO {};

  userDAO.addUser(user) {
    var newUser = new userModel(user);
    return newUser.save();
  }

  userDAO.getUser(id) {
    return userModel.findById(id).lean().exec();
  }

  return userDAO;
};
 
 车型/ index.js 
 
"use strict";
var bluebird= require('bluebird');
var mongoose = bluebird.promisifyAll(require('mongoose'));

var Users = require ('./users');
var Events = require('./events');

module.exports.Users = new Users(mongoose);
module.exports.Events = new Events(mongoose);
 
 服务/ userActivity.js 
 
"use strict";
var db = require('../models');

module.exports = function(userID) {
  return db.Events.getEventsForUser(userId)
};
 
 现在问题在哪里 
 
 测试/ test.js 
 
"use strict";
var chai = require('chai');
chai.use(require('chai-as-promised');
var expect = chai.expect;

var mongoose = require('mongoose');
mongoose.connect("mongodb://localhost/testDB")

var db = require('../models');
var services = require('../services')

describe("sample tests", function() {
  var user1, user2;
  var user1TestEvents = [];    

  before(function(done) {
    db.Users.addUser({name:"John"}).
    then(function(john) {
      user1 = john;
      return db.Users.addUser({name: "Mary"});
    }).
    then(function(mary) {
      user2 = mary;
      return db.Events.addEvent{user: user1._id, event: "logged in", time: new Date()});
    }).
    then(function(event) {
     user1TestEvents.push(event);
     done()
    });
  };

  it('gets a users events', function() {
    var events = services.getEventsForUser(user1._id);
    return expect(events).eventually.to.have.length(user1TestEvents.length);
  });
 
 如果我连接到我自己的机器上的活动数据库，但测试工作得很好，但我们的CI服务器没有运行mongo数据库。 我一直在试图找出伪造连接的方法，但我还没有找到任何好的选择 
 
 我一直在尝试使用Mockgoose来模拟数据库，但除非将所有组件都一直向下传递mockgooe的猫鼬对象，否则它将无法工作。 
 
var mockgoose = require('mockgoose');
var mongoose = require('mongoose');
mockgoose(mongoose);

mongoose.connect("mongodb://localhost/test");
 
 当我尝试这样做后，第一个承诺在我的“之前”解决后，所有后续的承诺永远不会解决，摩卡超时。 
 
 我还没有能够让tingoDB工作，而且我感觉我失去了一些明显的东西。 
 
 我见过的所有例子都是非常简单的测试用例，其中模型创建在与猫鼬对象执行连接相同的位置，并且我将应用程序分开，我似乎无法与猫鼬解耦到实际的MongoDB实例。 
 
 如果有人有单元测试没有实际的MongoDB实例的MEAN应用程序的经验，我会很乐意提供一些关于如何修正我的布局和让我的单元测试工作的建议。 

I've been wracking my brains trying to figure out a way to handle mocking my MongoDB connection for my unit tests. I'm wondering what the proper method is for doing this since my application layout may be the issue. This is for a larger project with lots of modules.
 
The general layout
 
 package.json
 server.js
-models
    -index.js
    -users.js
    -events.js
    -...
-services
    -index.js
    -userActivity.js
    -...
 +public
+routes
+util
+test
 
models/users.js
 
"use strict";
modules.export = function(mongoose) {
  var Schema = mongoose.Schema;
  var userSchema = new Schema({ name: String });
  var userModel = mongoose.model('User', userSchema);
  var userDAO {};

  userDAO.addUser(user) {
    var newUser = new userModel(user);
    return newUser.save();
  }

  userDAO.getUser(id) {
    return userModel.findById(id).lean().exec();
  }

  return userDAO;
};
 
models/index.js
 
"use strict";
var bluebird= require('bluebird');
var mongoose = bluebird.promisifyAll(require('mongoose'));

var Users = require ('./users');
var Events = require('./events');

module.exports.Users = new Users(mongoose);
module.exports.Events = new Events(mongoose);
 
services/userActivity.js
 
"use strict";
var db = require('../models');

module.exports = function(userID) {
  return db.Events.getEventsForUser(userId)
};
 
Now here's where the problem is
 
test/test.js
 
"use strict";
var chai = require('chai');
chai.use(require('chai-as-promised');
var expect = chai.expect;

var mongoose = require('mongoose');
mongoose.connect("mongodb://localhost/testDB")

var db = require('../models');
var services = require('../services')

describe("sample tests", function() {
  var user1, user2;
  var user1TestEvents = [];    

  before(function(done) {
    db.Users.addUser({name:"John"}).
    then(function(john) {
      user1 = john;
      return db.Users.addUser({name: "Mary"});
    }).
    then(function(mary) {
      user2 = mary;
      return db.Events.addEvent{user: user1._id, event: "logged in", time: new Date()});
    }).
    then(function(event) {
     user1TestEvents.push(event);
     done()
    });
  };

  it('gets a users events', function() {
    var events = services.getEventsForUser(user1._id);
    return expect(events).eventually.to.have.length(user1TestEvents.length);
  });
 
The tests work just fine if I connect to a live database on my own machine, but our CI servers won't have a mongo database running on them. I have been trying to figure out some way of faking the connection but I haven't found any good alternatives
 
I have been trying to use Mockgoose to get mock the database but unless I pass the mockgooesed mongoose object all the way down through all the components it will not work.
 
var mockgoose = require('mockgoose');
var mongoose = require('mongoose');
mockgoose(mongoose);

mongoose.connect("mongodb://localhost/test");
 
When I tried this, after the first promise resolves in my "before", all subsequent promises never resolve and mocha times out.
 
I haven't been able to get tingoDB working either and I'm feeling like I'm missing something obvious.
 
All of the examples I've seen were very simple test cases where the models were created in the same location that the mongoose object performed the connection and with the way I have the application broken apart I can't seem to get a decoupling from mongoose to the actual MongoDB instance.
 
If anyone has experience with unit testing MEAN applications without an actual MongoDB instance I'd be very happy for some advice on how to fix my layout and get my unit tests working.

原文：https://stackoverflow.com/questions/30902622