anchor.diff:  
       // Register as a singleton, just for the purpose of this test
       if (!app.container.has<TodoController>()) {
  -      app.container.registerSingleton(ctrl = TodoController());
  +      app.container.registerSingleton(todoController = TodoController());
       }
   
       // Using mountController<T>();
  
positive.code:   });
  
    test('basic', () {
      expect(ctrl.app, app);
    });
  
    test('create dynamic handler', () async {
  
negative.code: 
  main() {
    Angel app;
    TodoController todoController;
    NoExposeController noExposeCtrl;
    HttpServer server;
    http.Client client = http.Client();
  