Stub In EmberJS

I want to test whether a save/update is happened in DB(back-end) of my ember application using stubbing.

I've gone through some articles on internet and could figure out below code to include in my test case.

stubbedModel = sinon.stub(controller, '***', function() {
    return null;
});

stubbedModel will return null if no save/update happened.

Can some please refer some link or article on this.