#!/usr/bin/env python
# -*- coding: utf-8 -*-


def mask_digits(x, y):
    """mask_digits

    Mask the higher digits of a number with those of a larger number

    :param x: number as str or int
    :param y: number as str or int
    :return x, y: tuple of the original numbers expanded
    """
    if y is not None:
        n_x = str(x)
        n_y = str(y)
        if len(n_x) > len(n_y):
            diff = len(n_x) - len(n_y)
            n_y = n_x[0:diff] + n_y

        x = int(n_x)
        y = int(n_y)

    return (x, y)


def test_none():
    assert mask_digits(66234, None) == (66234, None)


def test_mask_no_digits():
    assert mask_digits(11, 15) == (11, 15)


def test_mask_4_digits():
    assert mask_digits(12345, 6) == (12345, 12346)


def test_mask_3_digits():
    assert mask_digits(12345, 68) == (12345, 12368)


def test_mask_1_digits():
    assert mask_digits(8492, 512) == (8492, 8512)