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testingbackbone.jsjasmine
trivektor
trivektor

Reputation: 5638

Testing Backbone Model's trigger method with Jasmine

I got a weird error when testing the trigger method of my Backbone model. Below is my code:

Category = Backbone.Model.extend({
   fetchNotes: function() {
     this.trigger("notesFetchedEvent");
   }
})

describe("Category", function() {

 it("should fetch notes", function() {
   var category = new Category;
   spyOn(category, "trigger");
   category.fetchNotes();
   expect(category.trigger).wasCalledWith("notesFetchedEvent");
 })

})

The error I got was "Expected spy trigger to have been called with [ 'notesFetchedEvent' ] but was called with ...jibberish...". Does anyone know how to fix this? Thanks.

Upvotes: 3

Views: 3000

Answers (1)

Gregg
Gregg

Reputation: 2638

I've found that often the best way to test event triggering is to register a spy as one of the listeners on the event instead of spying on the trigger method directly. This would look something like this:

describe("Category", function() {
  it("should fetch notes", function() {
    var category = new Category();
    var spy = jasmine.createSpy('event');
    category.on('notesFetchedEvent', spy);
    category.fetchNotes();
    expect(spy).toHaveBeenCalled();
  });
});

Upvotes: 4

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