def METHOD_NAME():
    """
    Confirms function behaviour has not changed and is giving the same token for same inputs
    If these tokens change, this will invalidate some or all of the tokens handed out to learners
    """
    with freeze_time(datetime.datetime(2021, 1, 27, 0, 0, 0, tzinfo=datetime.timezone.utc)):
        token_now = _get_secure_token_for_xblock_handler("12345", "some_block_key", 0, "some_hashing_key")
        token_previous = _get_secure_token_for_xblock_handler("12345", "some_block_key", -1, "some_hashing_key")
        assert token_now == "de8399a51fef6aa7584a"
        assert token_previous == "f3b5d92b8ca2934009e4"