Async testing with node-http-mocks

async-http-mocks.js

'use strict';

var EventEmitter = require('events').EventEmitter;
var httpMocks = require('node-mocks-http');

module.exports = {
    createRequest: httpMocks.createRequest.bind(httpMocks),
    createResponse: function (opts) {
        opts = opts || {};
        opts.eventEmitter = EventEmitter;

        var res = httpMocks.createResponse(opts);

        var emit = res.emit;
        res.emit = function (evt) {
            if (evt === 'end') {
                var data = res._isJSON ? JSON.parse(res._getData()) : res._getData();
                emit.call(res, 'end', data);
            } else {
                emit.apply(res, arguments);
            }
        };

        var end = res.end;
        res.end = function () {
            var args = arguments;
            process.nextTick(function () {
                end.apply(res, args);
            });
        };

        var json = res.json;
        res.json = function () {
            json.apply(res, arguments);
            res._isJSON = true;
            res.end();
        };

        var redirect = res.redirect;
        res.redirect = function () {
            redirect.apply(res, arguments);
            res.end();
        };

        return res;

    }
};

usage.js

var httpMocks = require('./async-http-mocks');
var api = require('./api');

var req = httpMocks.createRequest();
var res = httpMocks.createResponse();

it('gets a list of all users in json format', function (done) {
    
    api.getUsers(req, res);

    res.on('end', function (body) {
        assert.equal(body[0].username, 'foo');
        done();
    });

});