public static DnsServerAddresses rotational(Iterable<? extends InetSocketAddress> addresses) {
        return rotational0(sanitize(addresses));
    }
@Test
    public void testRotational() {
        DnsServerAddresses seq = DnsServerAddresses.rotational(ADDR1, ADDR2, ADDR3);

        DnsServerAddressStream i = seq.stream();
        assertNext(i, ADDR1);
        assertNext(i, ADDR2);
        assertNext(i, ADDR3);
        assertNext(i, ADDR1);
        assertNext(i, ADDR2);
        assertNext(i, ADDR3);

        i = seq.stream();
        assertNext(i, ADDR2);
        assertNext(i, ADDR3);
        assertNext(i, ADDR1);
        assertNext(i, ADDR2);
        assertNext(i, ADDR3);
        assertNext(i, ADDR1);

        i = seq.stream();
        assertNext(i, ADDR3);
        assertNext(i, ADDR1);
        assertNext(i, ADDR2);
        assertNext(i, ADDR3);
        assertNext(i, ADDR1);
        assertNext(i, ADDR2);

        i = seq.stream();
        assertNext(i, ADDR1);
        assertNext(i, ADDR2);
        assertNext(i, ADDR3);
        assertNext(i, ADDR1);
        assertNext(i, ADDR2);
        assertNext(i, ADDR3);
    }