anchor.diff:      });
   
       group('useContext -', () {
  -      var mountNode = DivElement();
  +      DivElement mountNode;
         _ContextProviderWrapper providerRef;
         int currentCount = 0;
         Context<int> testContext;
         Function useContextTestFunctionComponent;
   
         setUp(() {
  +        mountNode = DivElement();
  +
           UseContextTestComponent(Map props) {
             final context = useContext(testContext);
             currentCount = context;
  
positive.code:       });
  
        tearDown(() {
          currentCount = 0;
          testContext = null;
          useContextTestFunctionComponent = null;
  
negative.code:           ]);
          }
  
          testContext = react.createContext(1);
          useContextTestFunctionComponent =
              react.registerFunctionComponent(UseContextTestComponent, displayName: 'useContextTest');
  