anchor.diff:      test('ensure about dialog open', () {
         ModalUITester modalTester = new ModalUITester("aboutDialog");
         expect(modalTester.functionallyOpened, true);
  +      expect(modalTester.visuallyOpened, true);
       });
   
       test('close dialog', () { // 10 26107
  
positive.code:     String display = style.display;
      String visibility = style.visibility;
  
      return int.parse(opacity) > 0 && display != "none" && visibility != "visible";
    }
  
    List<SparkDialogButton> get buttons =>
  
negative.code:       modalTester.clickButton("done");
        expect(modalTester.functionallyOpened, false);
  
        return new Future.delayed(const Duration(milliseconds: 1000)).then((_){
          expect(modalTester.visuallyOpened, false);
        });
      });
  