diff --git a/tests/replication/tcp/test_remote_server_up.py b/tests/replication/tcp/test_remote_server_up.py
new file mode 100644
index 0000000000..d1c15caeb0
--- /dev/null
+++ b/tests/replication/tcp/test_remote_server_up.py
@@ -0,0 +1,62 @@
+# -*- coding: utf-8 -*-
+# Copyright 2020 The Matrix.org Foundation C.I.C.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from typing import Tuple
+
+from twisted.internet.interfaces import IProtocol
+from twisted.test.proto_helpers import StringTransport
+
+from synapse.replication.tcp.resource import ReplicationStreamProtocolFactory
+
+from tests.unittest import HomeserverTestCase
+
+
+class RemoteServerUpTestCase(HomeserverTestCase):
+ def prepare(self, reactor, clock, hs):
+ self.factory = ReplicationStreamProtocolFactory(hs)
+
+ def _make_client(self) -> Tuple[IProtocol, StringTransport]:
+ """Create a new direct TCP replication connection
+ """
+
+ proto = self.factory.buildProtocol(("127.0.0.1", 0))
+ transport = StringTransport()
+ proto.makeConnection(transport)
+
+ # We can safely ignore the commands received during connection.
+ self.pump()
+ transport.clear()
+
+ return proto, transport
+
+ def test_relay(self):
+ """Test that Synapse will relay REMOTE_SERVER_UP commands to all
+ other connections, but not the one that sent it.
+ """
+
+ proto1, transport1 = self._make_client()
+
+ # We shouldn't receive an echo.
+ proto1.dataReceived(b"REMOTE_SERVER_UP example.com\n")
+ self.pump()
+ self.assertEqual(transport1.value(), b"")
+
+ # But we should see an echo if we connect another client
+ proto2, transport2 = self._make_client()
+ proto1.dataReceived(b"REMOTE_SERVER_UP example.com\n")
+
+ self.pump()
+ self.assertEqual(transport1.value(), b"")
+ self.assertEqual(transport2.value(), b"REMOTE_SERVER_UP example.com\n")
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