So far, we have not done any testing. This is bad and not a best practice. We will rectify this here. We will only build a few tests, but it will demonstrate how to create tests. Create a directory named tests and create the routes.js file.

Open the file and paste the following code:

var routes = require('../routes'),
  config = require('../config'),
  nodeunit = require('nodeunit'),
  Request = require('./request'),
  Response = require('./response');

exports.indexRouteTest = function(test){
  var res = new Response();
  test.equal(res.view, undefined);
  routes.index({}, res);
  test.equal(res.view, 'index');
  test.equal(res.viewData.title, 'Index');
  test.done();
};

Here, we are testing the index route. It should call render on the response object passing in index as the view and an object that has title set to Index. To test this, we are not going to set up an entire Node.js and Express stack. We are just going to mock up what we need. We need a response object, so...