code: def test_attr_dict_to_dict(self):
      d = {"x": {"y": "z"}}
      attr_dict = AttrDict(d)
  
      assert attr_dict.to_dict() == d
  
      # Also check that mutation on the return value of to_dict() does not
      # touch attr_dict or the original object.
      attr_dict.to_dict()["x"]["y"] = "zed"
      assert attr_dict.x.y == "z"
      assert d["x"]["y"] == "z"
  
imports: import os
  import tempfile
  import unittest
  from collections.abc import Mapping
  from collections.abc import MutableMapping
  from typing import Mapping, MutableMapping
  from unittest.mock import MagicMock, mock_open, patch
  from parameterized import parameterized
  from toml import TomlDecodeError
  from streamlit.runtime.secrets import SECRETS_FILE_LOCS, AttrDict, Secrets
  from tests.exception_capturing_thread import call_on_threads
label_desc: Use image node_id 2 for calling the AttrDictTest obj's underlying member method code with example usage: obj.test_attr_dict_to_dict() without return types