diff --git a/tests/storage/databases/main/test_cache.py b/tests/storage/databases/main/test_cache.py
new file mode 100644
index 0000000000..3f71f5d102
--- /dev/null
+++ b/tests/storage/databases/main/test_cache.py
@@ -0,0 +1,117 @@
+# 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 unittest.mock import Mock, call
+
+from synapse.storage.database import LoggingTransaction
+
+from tests.replication._base import BaseMultiWorkerStreamTestCase
+from tests.unittest import HomeserverTestCase
+
+
+class CacheInvalidationTestCase(HomeserverTestCase):
+ def setUp(self) -> None:
+ super().setUp()
+ self.store = self.hs.get_datastores().main
+
+ def test_bulk_invalidation(self) -> None:
+ master_invalidate = Mock()
+
+ self.store._get_cached_user_device.invalidate = master_invalidate
+
+ keys_to_invalidate = [
+ ("a", "b"),
+ ("c", "d"),
+ ("e", "f"),
+ ("g", "h"),
+ ]
+
+ def test_txn(txn: LoggingTransaction) -> None:
+ self.store._invalidate_cache_and_stream_bulk(
+ txn,
+ # This is an arbitrarily chosen cached store function. It was chosen
+ # because it takes more than one argument. We'll use this later to
+ # check that the invalidation was actioned over replication.
+ cache_func=self.store._get_cached_user_device,
+ key_tuples=keys_to_invalidate,
+ )
+
+ self.get_success(
+ self.store.db_pool.runInteraction(
+ "test_invalidate_cache_and_stream_bulk", test_txn
+ )
+ )
+
+ master_invalidate.assert_has_calls(
+ [call(key_list) for key_list in keys_to_invalidate],
+ any_order=True,
+ )
+
+
+class CacheInvalidationOverReplicationTestCase(BaseMultiWorkerStreamTestCase):
+ def setUp(self) -> None:
+ super().setUp()
+ self.store = self.hs.get_datastores().main
+
+ def test_bulk_invalidation_replicates(self) -> None:
+ """Like test_bulk_invalidation, but also checks the invalidations replicate."""
+ master_invalidate = Mock()
+ worker_invalidate = Mock()
+
+ self.store._get_cached_user_device.invalidate = master_invalidate
+ worker = self.make_worker_hs("synapse.app.generic_worker")
+ worker_ds = worker.get_datastores().main
+ worker_ds._get_cached_user_device.invalidate = worker_invalidate
+
+ keys_to_invalidate = [
+ ("a", "b"),
+ ("c", "d"),
+ ("e", "f"),
+ ("g", "h"),
+ ]
+
+ def test_txn(txn: LoggingTransaction) -> None:
+ self.store._invalidate_cache_and_stream_bulk(
+ txn,
+ # This is an arbitrarily chosen cached store function. It was chosen
+ # because it takes more than one argument. We'll use this later to
+ # check that the invalidation was actioned over replication.
+ cache_func=self.store._get_cached_user_device,
+ key_tuples=keys_to_invalidate,
+ )
+
+ assert self.store._cache_id_gen is not None
+ initial_token = self.store._cache_id_gen.get_current_token()
+ self.get_success(
+ self.database_pool.runInteraction(
+ "test_invalidate_cache_and_stream_bulk", test_txn
+ )
+ )
+ second_token = self.store._cache_id_gen.get_current_token()
+
+ self.assertGreaterEqual(second_token, initial_token + len(keys_to_invalidate))
+
+ self.get_success(
+ worker.get_replication_data_handler().wait_for_stream_position(
+ "master", "caches", second_token
+ )
+ )
+
+ master_invalidate.assert_has_calls(
+ [call(key_list) for key_list in keys_to_invalidate],
+ any_order=True,
+ )
+ worker_invalidate.assert_has_calls(
+ [call(key_list) for key_list in keys_to_invalidate],
+ any_order=True,
+ )
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