def check_data_dict_identical(data_dict_1, data_dict_2):
    """
    Check whether data_dicts are identical.
    Used by TestDataUnchanged below.
    """
    result = True  # assume True, unless proven otherwise
    if data_dict_1.keys() != data_dict_2.keys():
        result = False
    for key in data_dict_1.keys():
        if data_dict_1[key].identical(data_dict_2[key]) is not True:
            result = False
    return result