code: def test_empty(self) -> None:
      with self.assertRaises(ValueError):
          inject_nested_value({"foo": 42}, [], {"bar": 43})
  
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 1 for calling the TestInjectNestedValue obj's underlying member method code with example usage: obj.test_empty() without return types