code: def test_pre_expand_replaceable(self):
      # Check that the precreate method of a class is called once before
      # when expand_args_fields is called on the class.
  
      class A(ReplaceableBase):
          pass
  
          @classmethod
          def pre_expand(cls):
              pass
  
      class A1(A):
          n: 9
  
      A.pre_expand = Mock()
      expand_args_fields(A1)
      A.pre_expand.assert_called()
  
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 24 for calling the TestConfig obj's underlying member method code with example usage: obj.test_pre_expand_replaceable() without return types