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Asked: 2026-06-16T11:27:59+00:00

First time trying to use Jasmine spies so I hope I’m just missing something

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First time trying to use Jasmine spies so I hope I’m just missing something obvious. What I want to do is track calls to a function that I have defined as:

window.myFunction = ->

I have a class method that calls this function. The method works fine, and I can test most aspects of it, but the following fails:

beforeEach ->
  spyOn(window, 'myFunction').andCallThrough()

it 'should do that thing', ->
  MyClass.makesCallToMyFunction
  expect(window.myFunction).toHaveBeenCalled()

What am I doing wrong? I’ve seen plenty of examples on SO and many of them use the spyOn(window, ‘myFunction’)…expect(window.myFunction) setup/spec.

Any insight is appreciated! Thanks.

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1 Answer

  1. Editorial Team

    This will fail:

    it 'should do that thing', ->
  MyClass.makesCallToMyFunction
  expect(window.myFunction).toHaveBeenCalled()

    because MyClass.makesCallToMyFunction is not a method call, that’s simply a reference to the makesCallToMyFunction function. If you want to call a CoffeeScript function/method without any arguments then you need to include the parentheses or CoffeeScript won’t know that you want to call the function:

    MyClass.makesCallToMyFunction()
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