def METHOD_NAME(
    user_factory,
    conference,
    submission_factory,
    schedule_item_factory,
    schedule_item_additional_speaker_factory,
):
    user = user_factory()
    additional_user = user_factory()
    submission = submission_factory(speaker_id=user.id, conference=conference)
    item = schedule_item_factory(
        type="submission", submission=submission, conference=conference
    )
    schedule_item_additional_speaker_factory(
        scheduleitem=item, user_id=additional_user.id
    )
    endpoint = convert_user_to_endpoint(additional_user)
    assert endpoint.id == str(additional_user.id)
    assert endpoint.name == additional_user.name
    assert endpoint.full_name == additional_user.full_name
    assert endpoint.is_staff == additional_user.is_staff
    assert endpoint.has_sent_submission_to == []
    assert endpoint.has_item_in_schedule == [conference.code]
    assert endpoint.has_cancelled_talks == []