How to make sure this function is never called?

[Felipe Coury]

I have this snippet of code (coffeescript):

@afterRender() if @afterRender

How can I test that afterRender is not called if it doesn't exist?

Here's the positive test:

    it 'calls afterRender when defined', ->

      called = false

      @view.afterRender = -> called = true

      @view.render()

      expect(called).toBeTruthy()

But everything I tried to come up with a good way to test failed me.

I am using sinon.js, so I can use its spies, mocks and stubs if you think that it would help.

Any ideas?

[Davis W. Frank]

You want to spy on the afterRender call and check the spy in the positive and negative test. I don't use Sinon.js, but here's a way to do it with JS and Jasmine's spies:

describe("MyView", function() {

var view;

beforeEach(function() {

view = new View();

spyOn(view, 'afterRender');

});

describe("when render is called", function() {

beforeEach(function() {

view.render();

});

it("should call the afterRender callback", function() {

 expect(view.afterRender).toHaveBeenCalled();

});

});

describe("when foo is called", function() {

beforeEach(function() {

view.foo();

});

it("should call the afterRender callback", function() {

 expect(view.afterRender).not.toHaveBeenCalled();

});

});

})

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thx,

--dwf