anchor.diff:  class UITester {
     SparkPolymerUI get ui => document.querySelector('#topUi');
     Element getUIElement(String selectors) => ui.getShadowDomElement(selectors);
  +}
  +
  +class SparkUITester extends UITester {
  +  SparkButton getButton(String id) => getUIElement("spark-button #$id");
  +
  +  void selectMenu() {
  +    getButton("main-menu").click();
  +  }
   }
   
   class ModalUITester extends UITester {
  
positive.code: 
  import 'package:spark_widgets/spark_dialog/spark_dialog.dart';
  import 'package:spark_widgets/spark_dialog_button/spark_dialog_button.dart';
  import 'package:spark_widgets/spark_modal/spark_modal.dart';
  import 'package:unittest/unittest.dart';
  
  
negative.code: }
  
  defineTests() {
    /*
    group('first run', () {
      test('ensure about dialog open', () {
        ModalUITester modalTester = new ModalUITester("aboutDialog");
  