jasmine_stealth.coffee

window.MapPoint = Backbone.Model.extend({
  initialize: function(attrs,options){
    this.location = options.location;
  },
  locationDescription: function(){
    var lat = this.location.get('lat'),
        lng = this.location.get('lng');
        
    return "("+lat+","+lng+")";
  }
});

jasmine_stealth_spec.coffee

describe('MapPoint',function(){
  var subject, location;
  beforeEach(function(){
    location = jasmine.createSpyObj('location',['get']);
    subject = new MapPoint({},{ location: location });
  });
  describe("#locationDescription", function(){
    var result,
        LAT = 39.9292,
        LNG = 14.1234;
    beforeEach(function(){
      location.get.when('lat').thenReturn(LAT);
      location.get.when('lng').thenReturn(LNG);
      
      result = subject.locationDescription();
    });
    
    it('prints it prettily', function(){
      expect(result).toBe("("+LAT+","+LNG+")");
    });
  });
});