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: 
      noExposeCtrl = await app.mountController<NoExposeController>();
  
      // Place controller in group...
      app.group('/ctrl_group', (router) {
        app.container
            .make<TodoController>()
            .applyRoutes(router, app.container.reflector);
      });
  
      print(app.controllers);
      app.dumpTree();
  
negative.code:   });
  
    test('basic', () {
      expect(todoController.app, app);
    });
  
    test('create dynamic handler', () async {
  