def METHOD_NAME(**attrs):
    global MESSAGE_COUNT
    MESSAGE_COUNT += 1
    src_uuid = str(uuid.uuid4())
    defaults = dict(
        uuid="msg-uuid-{}".format(MESSAGE_COUNT),
        filename="{}-msg.gpg".format(MESSAGE_COUNT),
        source_uuid=src_uuid,
        download_url="test",
        submission_url="test",
        is_read=False,
        file_counter=MESSAGE_COUNT,
        is_deleted_by_source=False,
        reply_url="test",
        size=1234,
        is_decrypted=True,
        is_downloaded=True,
        source_url=f"/api/v1/sources/{src_uuid}",
        seen_by=[],
    )
    defaults.update(attrs)
    return SDKSubmission(**defaults)