anchor.diff:  
   class DialogAccess {
     String _id;
  -  SparkUIAccess _sparkAccess = SparkUIAccess.instance;
  +  SparkUIAccess get _sparkAccess => new SparkUIAccess();
   
     DialogAccess(this._id);
   
  
positive.code: //      });
  //    });
  //  });
    SparkUIAccess scriptable = new SparkUIAccess();
    SparkUITester sparkTester = new SparkUITester(scriptable);
  
    group('new-project dialog', () {
      test('open and close the dialog via x button', () {
  
negative.code: class SparkUIAccess {
    static SparkUIAccess _instance;
  
    factory SparkUIAccess() {
      if (_instance == null) _instance = new SparkUIAccess._internal();
      return _instance;
    }
  
    SparkUIAccess._internal();
  
    SparkPolymerUI get _ui => document.querySelector('#topUi');
    Element getUIElement(String selectors) => _ui.getShadowDomElement(selectors);
  