Memasang spy pada event handler pada Backbone

ContohCollection.js

var ContohCollection = Backbone.Collection.extend({
  // ....
  initialize: function() {
    this.model.on("something", this.onSomething, this);
  },
  
  onSomething: function() {
    
  }
  // ....
});

ContohCollectionSpec.js

describe("ContohCollection Event Handling", function() {
  it("Should have called onSomething on something event", function() {
    // pasang spy pada collection sebelum ia diinisiasi
    spyOn(ContohCollection.prototype, "onSomething");
    var contohCollection = new ContohCollection();
    
    // logika lain
    
    // test
    model.trigger("something");
    expect(contohCollection.onSomething).toHaveBeenCalled();
  });
});