hostAddress = addresses[0].getHostAddress();
        assertTrue(hostAddress.contains(":"));
        assertTrue(hostAddress.contains("2001") || hostAddress.toLowerCase().contains("2001"));
    }

    public void test_resolve_ipv4() throws UnknownHostException {
        IdnDnsResolver resolver = new IdnDnsResolver();

        // Test IPv4 loopback address
        String host = "127.0.0.1";
        InetAddress[] addresses = resolver.resolve(host);