Feature testing in node.js

productPageSpec.js

feature('Product detail page', function () {
  scenario('User viewing page', function (done) {
    whenUserViewsAProduct(
      thenTheyShouldSeeCommonProductProperties(done)
    );
  });

  function whenUserViewsAProduct(then) {
    var productPath = '/Hurley-Hoodies-Hurley-Mataro-Hoody-Mahogany/Product/223996';
    makeRequest(testRequest(app).get(productPath), then);
  }

  function thenTheyShouldSeeCommonProductProperties(done) {
    return function (window) {
      expect(window.document.body).to.contain.text('Lovely Dress');
      expect(window.document.body).to.contain('img[alt="Lovely Dress"]');
      expect(window.document.body).to.contain.text('£44.99');
      done();
    };
  }
});

specHelper.js

process.env.NODE_ENV = 'test';

// Require our application
global.app = require('../app');

// Setup feature syntax for mocha
global.feature = describe;
global.scenario = it;

// Setup supertest
global.testRequest = require('supertest');

// Setup jsdom
var jsdom = require('jsdom');
var window = jsdom.jsdom().defaultView;
global.NodeList = window.NodeList; // required for chai-dom
global.HTMLElement = window.HTMLElement; // required for chai-dom

// Setup chai and chai-dom
var chai = require('chai');
chai.use(require('chai-dom'));
global.expect = chai.expect;

// Setup easy way to make request and initialise window for assertions
global.makeRequest = function (superTestApp, callback) {
  superTestApp.end(function(err, response) {
    if (err) throw err;

    jsdom.env({
      html: response.text,
      done: function (err, window) {
        if (err) throw err;
        callback(window);
      }
    });
  });
};