Expected a spy, but got Function

Question

I am trying to implement a test (1) for this module (2).
My purpose is to check if the collection is fetched when a particular event is triggered.
As you can see from my comment in (2) I get the message Error: Expected a spy, but got Function.
The module works but the test fails. any ideas?

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(1)

// jasmine test module  describe('When onGivePoints is fired', function () {     beforeEach(function () {         spyOn(this.view.collection, 'restartPolling').andCallThrough();         app.vent.trigger('onGivePoints');     });     it('the board collection should be fetched', function () {         expect(this.view.collection.restartPolling).toHaveBeenCalled();        // Error: Expected a spy, but got Function.     }); }); 

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(2)

// model view module return Marionette.CompositeView.extend({     initialize: function () {         this.collection = new UserBoardCollection();         this.collection.startPolling();         app.vent.on('onGivePoints', this.collection.restartPolling);     },     // other code }); 

Answer 1

You need to get into the actual method, which in this case is on the prototype.

describe('When onGivePoints is fired', function () {     beforeEach(function () {         spyOn(UsersBoardCollection.prototype, 'restartPolling').andCallThrough();         app.vent.trigger('onGivePoints');     });     it('the board collection should be fetched', function () {         expect(UsersBoardCollection.prototype.restartPolling).toHaveBeenCalled();     }); }); 

Spying on the prototype is a nice trick you can use when you can't get to the actual instance you want to spy on.