stub test

stub-test.coffee

describe "calculator", ->
  it "should call the given method when parameter is valid", ->

    # stub the method instead of just 'spying' it
    minusStub = sinon.stub sample, 'minus'

    methods = ['multiple', 'addition', 'minus', 'divide']
    sample.calculator('minus', 1)
    sinon.assert.calledOnce(minusStub)
    sinon.assert.calledWithExactly(minusStub, [1])

    # restore the minus method
    minusStub.restore()