I am trying to test a backbone.model when saving.
Here's my piece of code.
As you can see from the comment there is a problem with toHaveBeenCalledOnce method.

P.S.:
I am using jasmine 1.2.0 and Sinon.JS 1.3.4

    describe('when saving', function ()
    {
        beforeEach(function () {
            this.server = sinon.fakeServer.create();
            this.responseBody = '{"id":3,"title":"Hello","tags":["garden","weekend"]}';
            this.server.respondWith(
                'POST',
                Routing.generate(this.apiName),
                [
                    200, {'Content-Type': 'application/json'}, this.responseBody
                ]
            );
            this.eventSpy = sinon.spy();
        });

        afterEach(function() {
            this.server.restore();
        });

        it('should not save when title is empty', function() {
            this.model.bind('error', this.eventSpy);
            this.model.save({'title': ''});

            expect(this.eventSpy).toHaveBeenCalledOnce(); // TypeError: Object [object Object] has no method 'toHaveBeenCalledOnce'
            expect(this.eventSpy).toHaveBeenCalledWith(this.model, 'cannot have an empty title');
        });
    });

console.log(expect(this.eventSpy));