old_contents: import pytest
  
  from rest_framework.test import APIRequestFactory
  
  
  @pytest.fixture()
  def factory():
      """APIRequestFactory instance."""
  
      return APIRequestFactory()
  
new_contents: import pytest
  
  from rest_framework.test import APIRequestFactory
  
  
  @pytest.fixture()
  def factory() -> APIRequestFactory:
      """APIRequestFactory instance."""
  
      return APIRequestFactory()
  
subject: Write missing annotation