express4.router isolation testing

app.coffee

# app/app.coffee

express = require 'express'
app = express()

app.use require 'controllers/status'
app.listen(80)

status.coffee

# app/controllers/status.coffee

express = require 'express'
module.exports = exports = express.Router()

exports.get '/status', (req, res) ->
  res.json status: 'available', timestamp: new Date().toISOString()

status.spec.coffee

# app/spec/controllers/status.spec.coffee

chai = require('chai')
expect = chai.expect

describe 'controllers', ->
  # ...

  describe 'status', ->
    @controller = require.main.require 'app/controllers/status'

    it 'responds with available and timestamp if everything is up and running', (done) =>
      async_expectations = (data) ->
        expect(data?.status).to.eq 'available'
        done()
      @controller.handle {url: '/status', method: 'get'}, {json: async_expectations}