Added zmq_send_const test

tests/test_pair_inproc.cpp

@@ -36,6 +36,27 @@ int main (void)
     assert (rc == 0);
     
     bounce (sb, sc);
+    
+    // Test zmq_send_const
+    rc = zmq_send_const (sb, "foo", 3, ZMQ_SNDMORE);
+    assert (rc == 3);
+    rc = zmq_send_const (sb, "foobar", 6, 0);
+    assert (rc == 6);
+    
+    zmq_msg_t msg;
+    rc = zmq_msg_init (&msg);
+    assert (rc == 0);
+    rc = zmq_msg_recv (&msg, sc, 0);
+    assert (rc == 3);
+    assert (zmq_msg_size (&msg) == 3);
+    void* data = zmq_msg_data (&msg);
+    assert (memcmp ("foo", data, 3) == 0);
+    rc = zmq_msg_recv (&msg, sc, 0);
+    assert (rc == 6);
+    data = zmq_msg_data (&msg);
+    assert (memcmp ("foobar", data, 3) == 0);
+    
+    // Cleanup
 
     rc = zmq_close (sc);
     assert (rc == 0);