code: def test_detect_bases(self):
      # testing the _base_class_from_class function
      self.assertIsNone(
          _Registry._base_class_from_class(ReplaceableBase)
      )
      self.assertIsNone(_Registry._base_class_from_class(MainTest))
      self.assertIs(_Registry._base_class_from_class(Fruit), Fruit)
      self.assertIs(_Registry._base_class_from_class(Pear), Fruit)
  
      class PricklyPear(Pear):
          pass
  
      self.assertIs(
          _Registry._base_class_from_class(PricklyPear), Fruit
      )
  
imports: import pickle
  import textwrap
  import unittest
  from dataclasses import dataclass, field, is_dataclass
  from enum import Enum
  from typing import Any, Dict, List, Optional, Tuple
  from unittest.mock import Mock
  from omegaconf import DictConfig, ListConfig, OmegaConf, ValidationError
  from pytorch3d.implicitron.tools.config import _get_type_to_process, _is_actually_dataclass, _ProcessType, _Registry, Configurable, enable_get_default_args, expand_args_fields, get_default_args, get_default_args_field, registry, remove_unused_components, ReplaceableBase, run_auto_creation
label_desc: Use image node_id 4 for calling the TestConfig obj's underlying member method code with example usage: obj.test_detect_bases() without return types