code: def test_replace_dunder_methods_multiple_loaders_without_init():
      """In case of a class, that inherits from a class that we are patching, but doesn't define its own `__init__`
      method (the one we are wrapping), it can happen, that `hasattr(cls, "__old__init__")` is True because of parent
      class, but it is impossible to delete, because that method is owned by parent class. Furthermore, the error occured
      only sometimes because it depends on the order in which we are iterating over a set of classes we are patching.
  
      This test simulates the behavior by generating sufficient number of dummy classes, which do not define `__init__`
      and are children of `DataLoader`. We are testing that a) context manager `_replace_dunder_method` exits cleanly, and
      b) the mechanism checking for presence of `__old__init__` works as expected.
  
      """
      classes = [DataLoader]
      for i in range(100):
          classes.append(
              type(f"DataLoader_{i}", (random.choice(classes),), {})
          )
  
      before = {cls: cls.__init__ for cls in classes}
  
      with _replace_dunder_methods(DataLoader, "dataset"):
          for cls in classes[1:]:  # First one is `DataLoader`
              assert "__old__init__" not in cls.__dict__
              assert hasattr(cls, "__old__init__")
  
          assert "__old__init__" in DataLoader.__dict__
          assert hasattr(DataLoader, "__old__init__")
  
      for cls in classes:
          assert before[cls] == cls.__init__
  
imports: import contextlib
  import os
  import random
  from unittest import mock
  from unittest.mock import Mock
  import lightning.fabric
  import numpy
  import pytest
  import torch
  from lightning.fabric.utilities.data import AttributeDict, _get_dataloader_init_args_and_kwargs, _replace_dunder_methods, _replace_value_in_saved_args, _set_sampler_epoch, _update_dataloader, _WrapAttrTag, has_iterable_dataset, has_len, suggested_max_num_workers
  from lightning.fabric.utilities.exceptions import MisconfigurationException
  from lightning_utilities.test.warning import no_warning_call
  from torch import Tensor
  from torch.utils.data import BatchSampler, DataLoader, RandomSampler
  from tests_fabric.helpers.models import RandomDataset, RandomIterableDataset
label_desc: Use image node_id 3 for calling a global function with example usage: test_replace_dunder_methods_multiple_loaders_without_init() without return types