diff --git a/tests/handlers/test_worker_lock.py b/tests/handlers/test_worker_lock.py
new file mode 100644
index 0000000000..73e548726c
--- /dev/null
+++ b/tests/handlers/test_worker_lock.py
@@ -0,0 +1,74 @@
+# Copyright 2023 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 twisted.internet import defer
+from twisted.test.proto_helpers import MemoryReactor
+
+from synapse.server import HomeServer
+from synapse.util import Clock
+
+from tests import unittest
+from tests.replication._base import BaseMultiWorkerStreamTestCase
+
+
+class WorkerLockTestCase(unittest.HomeserverTestCase):
+ def prepare(
+ self, reactor: MemoryReactor, clock: Clock, homeserver: HomeServer
+ ) -> None:
+ self.worker_lock_handler = self.hs.get_worker_locks_handler()
+
+ def test_wait_for_lock_locally(self) -> None:
+ """Test waiting for a lock on a single worker"""
+
+ lock1 = self.worker_lock_handler.acquire_lock("name", "key")
+ self.get_success(lock1.__aenter__())
+
+ lock2 = self.worker_lock_handler.acquire_lock("name", "key")
+ d2 = defer.ensureDeferred(lock2.__aenter__())
+ self.assertNoResult(d2)
+
+ self.get_success(lock1.__aexit__(None, None, None))
+
+ self.get_success(d2)
+ self.get_success(lock2.__aexit__(None, None, None))
+
+
+class WorkerLockWorkersTestCase(BaseMultiWorkerStreamTestCase):
+ def prepare(
+ self, reactor: MemoryReactor, clock: Clock, homeserver: HomeServer
+ ) -> None:
+ self.main_worker_lock_handler = self.hs.get_worker_locks_handler()
+
+ def test_wait_for_lock_worker(self) -> None:
+ """Test waiting for a lock on another worker"""
+
+ worker = self.make_worker_hs(
+ "synapse.app.generic_worker",
+ extra_config={
+ "redis": {"enabled": True},
+ },
+ )
+ worker_lock_handler = worker.get_worker_locks_handler()
+
+ lock1 = self.main_worker_lock_handler.acquire_lock("name", "key")
+ self.get_success(lock1.__aenter__())
+
+ lock2 = worker_lock_handler.acquire_lock("name", "key")
+ d2 = defer.ensureDeferred(lock2.__aenter__())
+ self.assertNoResult(d2)
+
+ self.get_success(lock1.__aexit__(None, None, None))
+
+ self.get_success(d2)
+ self.get_success(lock2.__aexit__(None, None, None))
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