assertTrue(seven.compareTo(lowerCaseC) > 0, "expected 7 > c");
        assertTrue(lowerCaseC.compareTo(seven) < 0, "expected c < 7");
    }

    @Test
    void testNonAsciiDigits() { // These should not be treated as digits.
        ComparableVersion asciiOne = new ComparableVersion("1");
        ComparableVersion arabicEight = new ComparableVersion("\u0668");