docstr: Test setting, getting, and deleting tracked_modules
docstr_tok: ["Test","setting",",","getting",",","and","deleting","tracked_modules"]
code: def test_tracked_modules(self) -> None:
      """
      Test setting, getting, and deleting tracked_modules
      """
  
      my_unit = Dummy()
  
      # assert that the attributes are stored in tracked_modules
      self.assertEqual(
          my_unit.tracked_modules()["module_a"], my_unit.module_a
      )
      self.assertEqual(
          my_unit.tracked_modules()["loss_fn_b"], my_unit.loss_fn_b
      )
  
      # delete the attributes
      # pyre-fixme[8]: Attribute has type `Linear`; used as `None`.
      my_unit.module_a = None
      # pyre-fixme[8]: Attribute has type `CrossEntropyLoss`; used as `None`.
      my_unit.loss_fn_b = None
  
      # the attributes should be removed from tracked_modules
      self.assertFalse("module_a" in my_unit.tracked_modules())
      self.assertFalse("loss_fn_b" in my_unit.tracked_modules())
  
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 1 for calling the AppStateMixinTest obj's underlying member method code with example usage: obj.test_tracked_modules() without return types