assertFalse(UniAddress.isDotQuadIP(""), "isDotQuadIP should return false for empty string");
    }

    @ParameterizedTest
    @ValueSource(strings = { "123456", "007", "999" })
    void isAllDigitsTrueForPureNumeric(String numeric) {
        assertTrue(UniAddress.isAllDigits(numeric));
    }

    @ParameterizedTest
    @ValueSource(strings = { "12a", "abc", "123 " })