anchor.diff:        expect(element.jsElement['myMap']['hello'], 'world');
       });
   
  -    test('List', () {
  +    test('List',  () {
         element.set('myInts', [1, 2, 3]);
         expect(element.myInts, [1, 2, 3]);
         expect(element.jsElement['myInts'], [1, 2, 3]);
  
positive.code:       expect(element.myInts, [1, 4, 3]);
        expect(element.jsElement['myInts'], [1, 4, 3]);
      });
  
      test('JsProxy', () {
        var newModel = new Model('world');
  
negative.code: 
    @property
    List<int> myInts = [];
  
    @property
    List<Thing> myThings = [];
  
    @property
    Map myMap = {};
  