JavaScript Mocha tests for asynchronous functions mocha test asynchronous function,mocha tests async,mocha test asynchronous

(Answer in coffeescript. If you'd like to convert coffee to js use http://coffeescript.org/, then the Try CoffeeScript tab.)

If you're testing asynch code you'll need to use the done pattern:

describe "User", ->
  describe "#save()", ->
    it "should save without error", (done) ->
      user = new User("Luna")
      user.save done

http://visionmedia.github.io/mocha/ under "Asynchronous code". Looks like createJob is returning true because the test is zipping through the code to send the post etc. and saying "yep, I sent all that stuff like you asked!".

I'd recommend Martin Fowler's article on testing asynch js code with mocha: http://martinfowler.com/articles/asyncJS.html.

I've got a chunk of code that tests retrieval of a user from the database (using sinon for stubbing). The real code connects to the db then calls the onSuccess with the user's configuration: onSuccess(config)

  describe 'Config', ->
    orgId = 'a'
    errorHandler = ((msg) -> (throw msg))
    beforeEach ->
      readConfig = sinon.stub(sdl , 'getConfig')
      readConfig.callsArgOnWithAsync(2, configSource, JSON.parse(jsonConfig))
    afterEach ->
      configSource.getConfig.restore()

... later

  configSource.getConfig('520bc323de4b6f7845543288', errorHandler, (config) ->
      config.should.not.be.null
      config.should.have.property('preferences')
      done()
  )
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