anchor.diff:      test('navigate to same view with different params', () {
         //given
         var view = new DummyView();
  -      var params = {'param': 'bozi_pan'};
  +      var params = {'param': 'happy_kitty'};
         var history = new Mock();
         var navigator = new PageNavigator(new MockRouter(), history);
   
  
positive.code:     test('navigate to same view with different params', () {
        //given
        var route = new Route("/dummy/{param}/");
        var paramsOld = {'param': 'bozi_pan'};
        var paramsNew = {'param': 'mega_motac'};
        var pathNew = route.path(paramsNew);
  
        var view = new SpyView();
  
negative.code:       var data = view.data;
        navigator.navigate('second',{});
  
        data['param'] = 'vacuumcleaner';
      });
  
    });
  