code: def test_dict(self) -> None:
      self.assertIs(
          extract_nested_type(
              SampleOuterConfig,
              ["my_list_of_schemas", "42", "my_default"],
          ),
          int,
      )
  
imports: from enum import Enum
  from typing import ClassVar, Dict, List, Optional, Union
  from unittest import main, TestCase
  import attr
  from torchbiggraph.schema import Dumper, extract_nested_type, inject_nested_value, Loader, Schema, schema, unpack_optional
label_desc: Use image node_id 4 for calling the TestExtractNestedType obj's underlying member method code with example usage: obj.test_dict() without return types