public static Ip4Prefix valueOf(int address, int prefixLength) {
        return new Ip4Prefix(Ip4Address.valueOf(address), prefixLength);
    }
@Test(expected = IllegalArgumentException.class)
    public void testInvalidValueOfIntegerTooLongPrefixLengthIPv4() {
        Ip4Prefix ipPrefix;

        ipPrefix = Ip4Prefix.valueOf(0x01020304, 33);
    }