diff --git a/tests/replication/test_sharded_event_persister.py b/tests/replication/test_sharded_event_persister.py
new file mode 100644
index 0000000000..6068d14905
--- /dev/null
+++ b/tests/replication/test_sharded_event_persister.py
@@ -0,0 +1,102 @@
+# -*- 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.
+import logging
+
+from synapse.rest import admin
+from synapse.rest.client.v1 import login, room
+
+from tests.replication._base import BaseMultiWorkerStreamTestCase
+from tests.utils import USE_POSTGRES_FOR_TESTS
+
+logger = logging.getLogger(__name__)
+
+
+class EventPersisterShardTestCase(BaseMultiWorkerStreamTestCase):
+ """Checks event persisting sharding works
+ """
+
+ # Event persister sharding requires postgres (due to needing
+ # `MutliWriterIdGenerator`).
+ if not USE_POSTGRES_FOR_TESTS:
+ skip = "Requires Postgres"
+
+ servlets = [
+ admin.register_servlets_for_client_rest_resource,
+ room.register_servlets,
+ login.register_servlets,
+ ]
+
+ def prepare(self, reactor, clock, hs):
+ # Register a user who sends a message that we'll get notified about
+ self.other_user_id = self.register_user("otheruser", "pass")
+ self.other_access_token = self.login("otheruser", "pass")
+
+ def default_config(self):
+ conf = super().default_config()
+ conf["redis"] = {"enabled": "true"}
+ conf["stream_writers"] = {"events": ["worker1", "worker2"]}
+ conf["instance_map"] = {
+ "worker1": {"host": "testserv", "port": 1001},
+ "worker2": {"host": "testserv", "port": 1002},
+ }
+ return conf
+
+ def test_basic(self):
+ """Simple test to ensure that multiple rooms can be created and joined,
+ and that different rooms get handled by different instances.
+ """
+
+ self.make_worker_hs(
+ "synapse.app.generic_worker", {"worker_name": "worker1"},
+ )
+
+ self.make_worker_hs(
+ "synapse.app.generic_worker", {"worker_name": "worker2"},
+ )
+
+ persisted_on_1 = False
+ persisted_on_2 = False
+
+ store = self.hs.get_datastore()
+
+ user_id = self.register_user("user", "pass")
+ access_token = self.login("user", "pass")
+
+ # Keep making new rooms until we see rooms being persisted on both
+ # workers.
+ for _ in range(10):
+ # Create a room
+ room = self.helper.create_room_as(user_id, tok=access_token)
+
+ # The other user joins
+ self.helper.join(
+ room=room, user=self.other_user_id, tok=self.other_access_token
+ )
+
+ # The other user sends some messages
+ rseponse = self.helper.send(room, body="Hi!", tok=self.other_access_token)
+ event_id = rseponse["event_id"]
+
+ # The event position includes which instance persisted the event.
+ pos = self.get_success(store.get_position_for_event(event_id))
+
+ persisted_on_1 |= pos.instance_name == "worker1"
+ persisted_on_2 |= pos.instance_name == "worker2"
+
+ if persisted_on_1 and persisted_on_2:
+ break
+
+ self.assertTrue(persisted_on_1)
+ self.assertTrue(persisted_on_2)
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