def METHOD_NAME():
    request_params = dict(
        file_name="dataset_description.slsx",
        file_size=_SIZEBYTES,
        file_type="MSExcel",
        download_link=_DOWNLOAD_LINK,
    )
    file_params = parse_obj_or_none(FileParams, request_params)
    assert file_params
    service_params = parse_obj_or_none(ServiceParams, request_params)
    assert not service_params
    file_and_service_params = parse_obj_or_none(
        ServiceAndFileParams | FileParams | ServiceParams, request_params
    )
    assert isinstance(file_and_service_params, FileParams)