promise-helper-for-deferred-style-resolve

A promise helper for deferred style resolve.

You can write tests easily, without any jQuery.

How to use

Get promise objcet, resolve & reject functions via promiseDeferred()

var promiseDeferred = require('promise-helper-for-deferred-style-resolve');

var response = promiseDeferred(function() {
  return successCallback(data);
}, function() {
  return failCallback(data);
});

# response object is
# {
#  promise: promise,
#  resolve: resolve,
#  reject:  reject
# }

If you want writing success case, you just write response.resolve(), in your test case, The success calback will be called. And, you can also do failed case, call response.reject().

You can assert (and resolve) like below code.

response.then(function() {
    assert(callback.withArgs("success").calledOnce);
    done()
});
response.resolve();

For example.

assert   = require 'power-assert'
sinon    = require 'sinon'
request  = require 'superagent'
deferred = require 'promise-deferred'

ToDo   = require './ToDo'

describe "load all", ->
  beforeEach ->
    sinon.stub(request, 'get', (url, cb) ->
      ok = {ok: true, status: 200, text: "OK"}
      ng = {ok: false, status: 404, text: "Not Found"}
      return deferred(() -> cb ok, () -> cb ng)
    )

  afterEach ->
    request.get.restore()

  it "call the ajax once", () ->
    ToDo.loadAll(sinon.spy()).resolve()
    assert(request.get.calledOnce)

   it "yield success", () ->
    callback = sinon.spy()
    {promise, resolve} = ToDo.loadAll(callback)
    promise.then(()->
      assert(callback.withArgs(200, [t]).calledOnce)
      done()
    ).catch((e) -> done(e))
    resolve()

  it "yield error", () ->
    callback = sinon.spy()
    {promise, reject} = ToDo.loadAll(callback)
    promise.then(()->
      assert(callback.withArgs(400).calledOnce)
      done()
    ).catch((e) -> done(e))
    reject()