public void testOpenOplocked () throws UnknownHostException, IOException {
        CIFSContext c = getContext();
        c = withTestNTLMCredentials(c);
        try ( SmbTransportInternal trans = c.getTransportPool().getSmbTransport(c, getTestServer(), 0, false, true)
                .unwrap(SmbTransportInternal.class);
              SmbSession sess = trans.unwrap(SmbTransportInternal.class).getSmbSession(c, getTestServer(), null);

            // https://lists.samba.org/archive/samba-technical/2009-August/066486.html
            // UniAddress addr = UniAddress.getByName(authDomain, true, tf);
            // SmbTransport trans = tf.getTransportPool().getSmbTransport(tf, addr, 0);
            try ( SmbTransport dc = getDc(tf, authDomain) ) {
                CacheEntry<Map<String, CacheEntry<DfsReferralDataInternal>>> entry = new CacheEntry<>(tf.getConfig().getDfsTtl() * 10L);

                        log.println("DFS redirect: " + dr);

                    UniAddress addr = UniAddress.getByName(dr.server);
                    SmbTransport trans = SmbTransport.getSmbTransport(addr, url.getPort());
                    /* This is a key point. This is where we set the "tree" of this file which
                     * is like changing the rug out from underneath our feet.
                     */