Sinon Mocks vs. Stubs

example.coffee

sinon = require('sinon')
should = require('chai').should()

class Bar
  print: (message) ->
    message

class Foo
  doSomething: (bar)->
    console.log(bar.print('hello'))

describe "mocks vs. stubs with sinon.js", ->

  it "you could use a mock", ->
    bar = new Bar
    mock = sinon.mock(bar).expects("print").once().returns('howdy')

    new Foo().doSomething(bar)
    mock.verify() # verify what?! oh... line 19. COMEFROM, lol

  it "but why not use a stub", ->
    bar = new Bar
    barPrintStub = sinon.stub(bar, "print").returns('aloha')

    new Foo().doSomething(bar)
    barPrintStub.called.should.be.true