docstr: Test setting and getting miscellaneous stateful objects
docstr_tok: ["Test","setting","and","getting","miscellaneous","stateful","objects"]
code: def test_miscellaneous_stateful(self) -> None:
      """
      Test setting and getting miscellaneous stateful objects
      """
  
      my_unit = Dummy()
  
      # assert that the grad scaler is stored in the app_state
      self.assertEqual(
          my_unit.app_state()["grad_scaler_e"], my_unit.grad_scaler_e
      )
  
      # delete the attribute
      # pyre-fixme[8]: Attribute has type `GradScaler`; used as `None`.
      my_unit.grad_scaler_e = None
  
      # the attribute should be removed from tracked_misc_statefuls
      self.assertFalse(
          "grad_scaler_e" in my_unit.tracked_misc_statefuls()
      )
  
imports: import unittest
  from typing import Any, Dict
  from unittest.mock import patch
  import torch
  from torch import nn
  from torchtnt.framework._test_utils import DummyAutoUnit
  from torchtnt.framework.unit import AppStateMixin
  from torchtnt.utils.env import init_from_env
  from torchtnt.utils.lr_scheduler import TLRScheduler
  from torchtnt.utils.prepare_module import FSDPOptimizerWrapper
label_desc: Use image node_id 4 for calling the AppStateMixinTest obj's underlying member method code with example usage: obj.test_miscellaneous_stateful() without return types