code: def test_add_node_uid_for_key(faker, node_context):
      @dataclass
      class MockObject:
          name: str
  
          def __iter__(self):
              yield from self.__dict__.items()
  
      mock_obj = MockObject(
          name=faker.name(),
      )
  
      transform_context = TransformContext.from_context(
          obj=mock_obj, context=node_context
      )
  
      key = "random_uid_key"
  
      result_func = add_node_uid_for_key(key=key)
      assert isinstance(result_func, FunctionType)
      result = result_func(context=transform_context)
      assert isinstance(result, TransformContext)
      assert key in result.output
      assert result.output[key] == node_context.node.id
  
imports: from dataclasses import dataclass
  from types import FunctionType
  from typing import Callable
  from typing import Optional
  from pydantic import EmailError
  from pydantic import EmailStr
  import pytest
  from syft.types.transforms import NotNone
  from syft.types.transforms import TransformContext
  from syft.types.transforms import add_credentials_for_key
  from syft.types.transforms import add_node_uid_for_key
  from syft.types.transforms import drop
  from syft.types.transforms import generate_id
  from syft.types.transforms import geteitherattr
  from syft.types.transforms import keep
  from syft.types.transforms import make_set_default
  from syft.types.transforms import rename
  from syft.types.transforms import validate_email
  from syft.types.transforms import validate_url
  from syft.types.uid import UID
label_desc: Use image node_id 9 for calling a global function with example usage: test_add_node_uid_for_key(faker, node_context) without return types