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diff --git a/tests/testutil.hpp b/tests/testutil.hpp
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+/*
+    Copyright (c) 2009-2011 250bpm s.r.o.
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_TEST_TESTUTIL_HPP_INCLUDED__
+#define __ZMQ_TEST_TESTUTIL_HPP_INCLUDED__
+
+#include "../include/zmq.h"
+#include <string.h>
+
+#undef NDEBUG
+#include <assert.h>
+
+inline void bounce (void *sb, void *sc)
+{
+    const char *content = "12345678ABCDEFGH12345678abcdefgh";
+
+    //  Send the message.
+    int rc = zmq_send (sc, content, 32, ZMQ_SNDMORE);
+    assert (rc == 32);
+    rc = zmq_send (sc, content, 32, 0);
+    assert (rc == 32);
+
+    //  Bounce the message back.
+    char buf1 [32];
+    rc = zmq_recv (sb, buf1, 32, 0);
+    assert (rc == 32);
+    int rcvmore;
+    size_t sz = sizeof (rcvmore);
+    rc = zmq_getsockopt (sb, ZMQ_RCVMORE, &rcvmore, &sz);
+    assert (rc == 0);
+    assert (rcvmore);
+    rc = zmq_recv (sb, buf1, 32, 0);
+    assert (rc == 32);
+    rc = zmq_getsockopt (sb, ZMQ_RCVMORE, &rcvmore, &sz);
+    assert (rc == 0);
+    assert (!rcvmore);
+    rc = zmq_send (sb, buf1, 32, ZMQ_SNDMORE);
+    assert (rc == 32);
+    rc = zmq_send (sb, buf1, 32, 0);
+    assert (rc == 32);
+
+    //  Receive the bounced message.
+    char buf2 [32];
+    rc = zmq_recv (sc, buf2, 32, 0);
+    assert (rc == 32);
+    rc = zmq_getsockopt (sc, ZMQ_RCVMORE, &rcvmore, &sz);
+    assert (rc == 0);
+    assert (rcvmore);
+    rc = zmq_recv (sc, buf2, 32, 0);
+    assert (rc == 32);
+    rc = zmq_getsockopt (sc, ZMQ_RCVMORE, &rcvmore, &sz);
+    assert (rc == 0);
+    assert (!rcvmore);
+
+    //  Check whether the message is still the same.
+    assert (memcmp (buf2, content, 32) == 0);
+}
+
+#endif