Example from http://twolfson.com/2015-01-11-testing-with-other-services

.gitignore

node_modules/

index.js

// Load in dependencies
var expect = require('chai').expect;
var FixedServer = require('fixed-server');
var httpUtils = require('request-mocha')(require('request'));

// Create a test server factory
// DEV: For logical consistency, we use keys which represent the route
var FixedApi = new FixedServer({port: 1337});
FixedApi.addFixtures({
  'GET 200 /': {
    method: 'get',
    route: '/',
    response: function (req, res) {
      res.send('Hello World');
    }
  },
  'GET 500 /': {
    method: 'get',
    route: '/',
    response: function (req, res) {
      res.status(500).send('An error has occurred');
    }
  }
});

// Start tests
describe('A request to a proxy server', function () {
  describe('with an operating backend', function () {
    // Launch a FixedApi hosting a 200 route
    FixedApi.run(['GET 200 /']);
    httpUtils.save('http://localhost:1337/');

    // Verify against our 200 route
    it('receives a 200 response', function () {
      expect(this.res).to.have.property('statusCode', 200);
    });
  });

  describe('with an non-functional backend', function () {
    // Launch a FixedApi hosting a 500 route
    FixedApi.run(['GET 500 /']);
    httpUtils.save('http://localhost:1337/');

    // Verify against our 500 route
    it('receives a 500 response', function () {
      expect(this.res).to.have.property('statusCode', 500);
    });
  });
});

package.json

{
  "name": "gist-eight-track-article-2",
  "version": "1.0.0",
  "description": "Example from http://twolfson.com/2015-01-11-testing-with-other-services",
  "main": "index.js",
  "author": "Todd Wolfson <todd@twolfson.com> (http://twolfson.com/)",
  "license": "UNLICENSE",
  "scripts": {
    "test": "mocha index.js"
  },
  "dependencies": {
    "chai": "~1.10.0",
    "fixed-server": "~0.4.0",
    "mocha": "~2.1.0",
    "request": "~2.51.0",
    "request-mocha": "~0.2.0"
  }
}