Javascript Unit testing dependencies - How to make a test fail when a depended object changes
===

I have a controller which is depended on a model property.
I wrote a test which test this controller and stubbed the model, How can I make my controller test fail whenever the model property name changes?

Here is an example:

Model:

    function Model(obj){
      this.id = obj.id; 
      this.name = obj.name;
    }

Controller:

    function Controller( model ){
      this.model = model
    };
    Controller.prototype.showName = function() { 
      return this.model.name; 
    }


Controller test:

    describe("A controller", function(){

      var controller = new Controller( new Model({id:1, name: "john"}) );
    
      it ("should show the person name", function(){
        expect(controller.showName).toEqual("john");
      });
    
    });

I want this test to fail whenever the "name" property changes to something else, something like "name2".

Anyone got a good suggestion on how to do it in javascript?

Thanks,
Shai