test: fix test failed in net namespace

mock socks.sendto related function

re6st/tests/test_unit/test_registry.py

@@ -235,6 +235,7 @@ class TestRegistryServer(unittest.TestCase):
 
         # TODO test too many prefix
 
+    @patch("re6st.registry.RegistryServer.sendto", Mock())
     @patch("re6st.registry.RegistryServer.createCertificate")
     def test_requestCertificate(self, mock_func):
         token = self.server.addToken(self.email, None)
@@ -312,6 +313,7 @@ class TestRegistryServer(unittest.TestCase):
         delete_cert(cur, prefix_new)
         cur.close()
 
+    @patch("re6st.registry.RegistryServer.sendto", Mock())
     @patch("re6st.registry.RegistryServer.recv")
     @patch("select.select", Mock(return_value=[1]))
     def test_queryAddress(self, recv):
@@ -348,6 +350,7 @@ class TestRegistryServer(unittest.TestCase):
         self.assertIsNone(self.server.sessions.get(prefix))
         self.assertIsNone(get_cert(self.server.db, prefix))
 
+    @patch("re6st.registry.RegistryServer.sendto", Mock())
     def test_updateHMAC(self):
         def get_hmac():
             return [self.server.getConfig(registry.BABEL_HMAC[i], None)