diff --git a/tests/replication/test_client_reader_shard.py b/tests/replication/test_client_reader_shard.py
new file mode 100644
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+++ b/tests/replication/test_client_reader_shard.py
@@ -0,0 +1,96 @@
+# -*- 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.api.constants import LoginType
+from synapse.http.site import SynapseRequest
+from synapse.rest.client.v2_alpha import register
+
+from tests.replication._base import BaseMultiWorkerStreamTestCase
+from tests.rest.client.v2_alpha.test_auth import DummyRecaptchaChecker
+from tests.server import FakeChannel
+
+logger = logging.getLogger(__name__)
+
+
+class ClientReaderTestCase(BaseMultiWorkerStreamTestCase):
+ """Base class for tests of the replication streams"""
+
+ servlets = [register.register_servlets]
+
+ def prepare(self, reactor, clock, hs):
+ self.recaptcha_checker = DummyRecaptchaChecker(hs)
+ auth_handler = hs.get_auth_handler()
+ auth_handler.checkers[LoginType.RECAPTCHA] = self.recaptcha_checker
+
+ def _get_worker_hs_config(self) -> dict:
+ config = self.default_config()
+ config["worker_app"] = "synapse.app.client_reader"
+ config["worker_replication_host"] = "testserv"
+ config["worker_replication_http_port"] = "8765"
+ return config
+
+ def test_register_single_worker(self):
+ """Test that registration works when using a single client reader worker.
+ """
+ worker_hs = self.make_worker_hs("synapse.app.client_reader")
+
+ request_1, channel_1 = self.make_request(
+ "POST",
+ "register",
+ {"username": "user", "type": "m.login.password", "password": "bar"},
+ ) # type: SynapseRequest, FakeChannel
+ self.render_on_worker(worker_hs, request_1)
+ self.assertEqual(request_1.code, 401)
+
+ # Grab the session
+ session = channel_1.json_body["session"]
+
+ # also complete the dummy auth
+ request_2, channel_2 = self.make_request(
+ "POST", "register", {"auth": {"session": session, "type": "m.login.dummy"}}
+ ) # type: SynapseRequest, FakeChannel
+ self.render_on_worker(worker_hs, request_2)
+ self.assertEqual(request_2.code, 200)
+
+ # We're given a registered user.
+ self.assertEqual(channel_2.json_body["user_id"], "@user:test")
+
+ def test_register_multi_worker(self):
+ """Test that registration works when using multiple client reader workers.
+ """
+ worker_hs_1 = self.make_worker_hs("synapse.app.client_reader")
+ worker_hs_2 = self.make_worker_hs("synapse.app.client_reader")
+
+ request_1, channel_1 = self.make_request(
+ "POST",
+ "register",
+ {"username": "user", "type": "m.login.password", "password": "bar"},
+ ) # type: SynapseRequest, FakeChannel
+ self.render_on_worker(worker_hs_1, request_1)
+ self.assertEqual(request_1.code, 401)
+
+ # Grab the session
+ session = channel_1.json_body["session"]
+
+ # also complete the dummy auth
+ request_2, channel_2 = self.make_request(
+ "POST", "register", {"auth": {"session": session, "type": "m.login.dummy"}}
+ ) # type: SynapseRequest, FakeChannel
+ self.render_on_worker(worker_hs_2, request_2)
+ self.assertEqual(request_2.code, 200)
+
+ # We're given a registered user.
+ self.assertEqual(channel_2.json_body["user_id"], "@user:test")
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