anchor.diff:    test('should not affect updating bindings', () async {
       final testBed = new NgTestBed<PushCmpWithRefHostComponent>();
       final testFixture = await testBed.create();
  -    final pushCmpWithRef = testFixture.rootElement.children.first;
  -    final cmp = getDebugNode(pushCmpWithRef).getLocal('cmp');
  +    final cmp = testFixture.assertOnlyInstance.child;
       expect(cmp.prop, 'one');
       await testFixture.update((component) => component.ctxProp = 'two');
       expect(cmp.prop, 'two');
  
positive.code: import 'package:angular_test/angular_test.dart';
  import 'package:test/test.dart';
  import 'package:angular/angular.dart';
  import 'package:angular/src/debug/debug_node.dart';
  
  import 'on_push_test.template.dart' as ng_generated;
  
  
negative.code:   test('should check component when bindings update', () async {
      final testBed = new NgTestBed<PushCmpHostComponent>();
      final testFixture = await testBed.create();
      final cmp = testFixture.assertOnlyInstance.child;
      expect(cmp.numberOfChecks, 1);
      await testFixture.update((component) => component.ctxProp = 'two');
      expect(cmp.numberOfChecks, 2);
  