old_contents: var request = require('supertest');
  var app = require('../index.js');
  
  describe('GET / in development env', function() {
    it('should return 200 OK', function(done) {
      request(app)
        .get('/')
        .expect(200, done);
    });
  });
  
  describe('GET /about in development env', function() {
    it('should return 404 Page Not Found', function(done) {
      request(app)
        .get('/about')
        .expect(404, done);
    });
  });
  
  app.set('env', 'production');
  
  describe('GET / in production env', function() {
    it('should return 200 OK', function(done) {
      request(app)
        .get('/')
        .expect(200, done);
    });
  });
  
  describe('GET /about in production env', function() {
    it('should return 404 Page Not Found', function(done) {
      request(app)
        .get('/about')
        .expect(404, done);
    });
  });
  
new_contents: var request = require('supertest');
  var app = require('../index.js');
  
  describe('GET /', function() {
    it('should return 200 OK', function(done) {
      request(app)
        .get('/')
        .expect(200, done);
    });
  });
  
  describe('GET /about', function() {
    it('should return 404 Page Not Found', function(done) {
      request(app)
        .get('/about')
        .expect(404, done);
    });
  });
  
subject: Revert back tests