Snooker Method / Mongoose Model Modeling

Question

Given a simple Mongoose model:

import mongoose, { Schema } from 'mongoose';

const PostSchema = Schema({
  title:    { type: String },
  postDate: { type: Date, default: Date.now }
}, { timestamps: true });

const Post = mongoose.model('Post', PostSchema);

export default Post;

I want to test this model, but I will hit several obstacles.

My current spec looks something like this (some things are omitted for brevity):

import mongoose from 'mongoose';
import { expect } from 'chai';
import { Post } from '../../app/models';

describe('Post', () => {
  beforeEach((done) => {
    mongoose.connect('mongodb://localhost/node-test');
    done();
  });

  describe('Given a valid post', () => {
    it('should create the post', (done) => {
      const post = new Post({
        title: 'My test post',
        postDate: Date.now()
      });

      post.save((err, doc) => {
        expect(doc.title).to.equal(post.title)
        expect(doc.postDate).to.equal(post.postDate);
        done();
      });
    });
  });
});

However, with this I hit my database every time I run the test, which I would rather avoid.

I tried using Mockgoose , but then my test will not run.

import mockgoose from 'mockgoose';
// in before or beforeEach
mockgoose(mongoose);

The test is stuck and gives an error message: Error: timeout of 2000ms exceeded. Ensure the done() callback is being called in this test.I tried to increase the timeout to 20 seconds, but this did not solve anything.

Then I threw out Mockgoose and tried to use Sinon to drown out the call save.

describe('Given a valid post', () => {
  it('should create the post', (done) => {
    const post = new Post({
      title: 'My test post',
      postDate: Date.now()
    });

    const stub = sinon.stub(post, 'save', function(cb) { cb(null) })
    post.save((err, post) => {
      expect(stub).to.have.been.called;
      done();
    });
  });
});

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Answer 1

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package.json

{
  "name": "xxx",
  "version": "0.1.0",
  "private": true,
  "main": "./src",
  "scripts": {
    "test" : "mocha --recursive"
  },
  "dependencies": {
    "mongoose": "*"
  },
  "devDependencies": {
    "mocha": "*",
    "chai": "*"
  }
}

/post.js

var mongoose = require("mongoose");

var PostSchema = new mongoose.Schema({
    title: { type: String },
    postDate: { type: Date, default: Date.now }
}, {
    timestamps: true
});

module.exports = PostSchema;

/index.js

var model = function(conn, schema, name) {
    var res = conn.models[name];
    return res || conn.model.bind(conn)(name, schema);
};

module.exports = {
    PostSchema: require("./post"),
    model: model
};

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/mock.js

var mongoose = require("mongoose");

// this method is propagated from node-mongodb-native
mongoose.Collection.prototype.insert = function(docs, options, callback) {
    // this is what the API would do if the save succeeds!
    callback(null, docs);
};

module.exports = mongoose;

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/test_model.js

// now we have mongoose with the mocked API
// but it is essential that our models are created AFTER 
// the API was mocked, not in the main source!
var mongoose = require("./mock"),
    assert = require("assert");

var underTest = require("../src");

describe("Post", function() {
    var Post;

    beforeEach(function(done) {
        var conn = mongoose.createConnection();
        Post = underTest.model(conn, underTest.PostSchema, "Post");
        done();
    });

    it("given valid data post.save returns saved document", function(done) {
        var post = new Post({
            title: 'My test post',
            postDate: Date.now()
        });
        post.save(function(err, doc) {
            assert.deepEqual(doc, post);
            done(err);
        });
    });

    it("given valid data Post.create returns saved documents", function(done) {
        var post = new Post({
            title: 'My test post',
            postDate: 876543
        });
        var posts = [ post ];
        Post.create(posts, function(err, docs) {
            try {
                assert.equal(1, docs.length);
                var doc = docs[0];
                assert.equal(post.title, doc.title);
                assert.equal(post.date, doc.date);
                assert.ok(doc._id);
                assert.ok(doc.createdAt);
                assert.ok(doc.updatedAt);
            } catch (ex) {
                err = ex;
            }
            done(err);
        });
    });

    it("Post.create filters out invalid data", function(done) {
        var post = new Post({
            foo: 'Some foo string',
            postDate: 876543
        });
        var posts = [ post ];
        Post.create(posts, function(err, docs) {
            try {
                assert.equal(1, docs.length);
                var doc = docs[0];
                assert.equal(undefined, doc.title);
                assert.equal(undefined, doc.foo);
                assert.equal(post.date, doc.date);
                assert.ok(doc._id);
                assert.ok(doc.createdAt);
                assert.ok(doc.updatedAt);
            } catch (ex) {
                err = ex;
            }
            done(err);
        });
    });

});

, - , -, Post.create post.save.

, :

~/source/web/xxx $npm test

> xxx@0.1.0 test /Users/osklyar/source/web/xxx
> mocha --recursive

Post
  ✓ given valid data post.save returns saved document
  ✓ given valid data Post.create returns saved documents
  ✓ Post.create filters out invalid data

3 passing (52ms)

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Answer 2

static's method's Mongoose, sinon sinon-mongoose. ( , chai)

, Mongo DB.

, , findLast

//If you are using callbacks
PostSchema.static('findLast', function (n, callback) {
  this.find().limit(n).sort('-postDate').exec(callback);
});

//If you are using Promises
PostSchema.static('findLast', function (n) {
  this.find().limit(n).sort('-postDate').exec();
});

,

var Post = mongoose.model('Post');
// If you are using callbacks, use yields so your callback will be called
sinon.mock(Post)
  .expects('find')
  .chain('limit').withArgs(10)
  .chain('sort').withArgs('-postDate')
  .chain('exec')
  .yields(null, 'SUCCESS!');

Post.findLast(10, function (err, res) {
  assert(res, 'SUCCESS!');
});

// If you are using Promises, use 'resolves' (using sinon-as-promised npm) 
sinon.mock(Post)
  .expects('find')
  .chain('limit').withArgs(10)
  .chain('sort').withArgs('-postDate')
  .chain('exec')
  .resolves('SUCCESS!');

Post.findLast(10).then(function (res) {
  assert(res, 'SUCCESS!');
});

( ) sinon-mongoose repo.