CODEWITHSUNDEEP
node.jsmongoosemocha.jssinonchai
Mdd
Mdd

Reputation: 4400

Unit Test Mongoose Promises

I have an express route in a Node application that uses Mongoose for querying a Mongo database. There is a promise used in the get request to find items and I am not sure how to test this promise.

I am not very familiar with unit testing node applications.

Here is the code for the express route, this works but I am not sure how to test it:

var express = require('express');
var router = express.Router();
var promise = require('bluebird');
// bluebird.promisifyAll is used on Mongoose in app.js
var ItemModel = require('./itemModel');

router.get('/', function(req, res, next) {
    ItemModel.findAsync()
        .then(function(items) {
            res.status(200).send(items);
        })
        .catch(function(err) {
            next(err);
        });

});

module.exports = router;

Here is what I have stubbed out in the test so far. I am not sure how to test the promise in the routes.get method :

describe('ItemRoute', function() {
    var express = require('express');
    var bodyParser = require('bodyParser');
    var supertest = require('supertest');
    var sinon = require('sinon');
    var expect = require('chai').expect;
    var assert = require('chai').assert;

    var ItemModel = require('./ItemModel');
    var ItemRoute = require('ItemRoute');

    var uri = '/items/';

    var agent;

    beforeEach(function(done) {
        var app = express();

        app.use(bodyParser.json());
        app.use(bodyParser.urlencoded({extended: false}));
        app.use(uri, releaseNotesRoute);

        agent = supertest.agent(app);

        done();
    });

    describe('GET', function() {
        it('returns an empty array when no items are stored in Mongo', function() {

            // Not sure how to test the route here with a get that
            // uses a promise, ItemModel.findAsync().then

        });
    });

});

Upvotes: 0

Views: 561

Answers (1)

PatBusz
PatBusz

Reputation: 46

to able to use promises in test, you should have to install sinon-as-promises module from npm. Then you can mock ItemModel like this:

var itemModelMock = sinon.mock(ItemModel);
itemModelMock.expects('findAsync').resolves([]);

Upvotes: 2

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