public static IpPrefix valueOf(int address, int prefixLength) {
        return new IpPrefix(IpAddress.valueOf(address), prefixLength);
    }
@Test(expected = NullPointerException.class)
    public void testInvalidValueOfNullArrayIPv4() {
        IpPrefix ipPrefix;
        byte[] value;

        value = null;
        ipPrefix = IpPrefix.valueOf(IpAddress.Version.INET, value, 24);
    }