def METHOD_NAME(open_question, user_factory, answer_factory):
    user1 = user_factory()
    user2 = user_factory()
    anonymous = AnonymousUser()
    answer = answer_factory(creator=user1, answer="user answer", question=open_question)
    assert open_question.user_answer(anonymous) == ""
    assert open_question.user_answer(user1) == answer.id
    assert open_question.user_answer(user2) == ""