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-rw-r--r--changelog.d/11972.misc1
-rw-r--r--synapse/notifier.py4
-rw-r--r--tests/rest/client/test_device_lists.py155
-rw-r--r--tests/rest/client/utils.py6
4 files changed, 163 insertions, 3 deletions
diff --git a/changelog.d/11972.misc b/changelog.d/11972.misc
new file mode 100644
index 0000000000..29c38bfd82
--- /dev/null
+++ b/changelog.d/11972.misc
@@ -0,0 +1 @@
+Add tests for device list changes between local users.
\ No newline at end of file
diff --git a/synapse/notifier.py b/synapse/notifier.py
index e0fad2da66..753dd6b6a5 100644
--- a/synapse/notifier.py
+++ b/synapse/notifier.py
@@ -138,7 +138,7 @@ class _NotifierUserStream:
         self.current_token = self.current_token.copy_and_advance(stream_key, stream_id)
         self.last_notified_token = self.current_token
         self.last_notified_ms = time_now_ms
-        noify_deferred = self.notify_deferred
+        notify_deferred = self.notify_deferred
 
         log_kv(
             {
@@ -153,7 +153,7 @@ class _NotifierUserStream:
 
         with PreserveLoggingContext():
             self.notify_deferred = ObservableDeferred(defer.Deferred())
-            noify_deferred.callback(self.current_token)
+            notify_deferred.callback(self.current_token)
 
     def remove(self, notifier: "Notifier") -> None:
         """Remove this listener from all the indexes in the Notifier
diff --git a/tests/rest/client/test_device_lists.py b/tests/rest/client/test_device_lists.py
new file mode 100644
index 0000000000..16070cf027
--- /dev/null
+++ b/tests/rest/client/test_device_lists.py
@@ -0,0 +1,155 @@
+# Copyright 2022 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 synapse.rest import admin, devices, room, sync
+from synapse.rest.client import account, login, register
+
+from tests import unittest
+
+
+class DeviceListsTestCase(unittest.HomeserverTestCase):
+    """Tests regarding device list changes."""
+
+    servlets = [
+        admin.register_servlets_for_client_rest_resource,
+        login.register_servlets,
+        register.register_servlets,
+        account.register_servlets,
+        room.register_servlets,
+        sync.register_servlets,
+        devices.register_servlets,
+    ]
+
+    def test_receiving_local_device_list_changes(self):
+        """Tests that a local users that share a room receive each other's device list
+        changes.
+        """
+        # Register two users
+        test_device_id = "TESTDEVICE"
+        alice_user_id = self.register_user("alice", "correcthorse")
+        alice_access_token = self.login(
+            alice_user_id, "correcthorse", device_id=test_device_id
+        )
+
+        bob_user_id = self.register_user("bob", "ponyponypony")
+        bob_access_token = self.login(bob_user_id, "ponyponypony")
+
+        # Create a room for them to coexist peacefully in
+        new_room_id = self.helper.create_room_as(
+            alice_user_id, is_public=True, tok=alice_access_token
+        )
+        self.assertIsNotNone(new_room_id)
+
+        # Have Bob join the room
+        self.helper.invite(
+            new_room_id, alice_user_id, bob_user_id, tok=alice_access_token
+        )
+        self.helper.join(new_room_id, bob_user_id, tok=bob_access_token)
+
+        # Now have Bob initiate an initial sync (in order to get a since token)
+        channel = self.make_request(
+            "GET",
+            "/sync",
+            access_token=bob_access_token,
+        )
+        self.assertEqual(channel.code, 200, channel.json_body)
+        next_batch_token = channel.json_body["next_batch"]
+
+        # ...and then an incremental sync. This should block until the sync stream is woken up,
+        # which we hope will happen as a result of Alice updating their device list.
+        bob_sync_channel = self.make_request(
+            "GET",
+            f"/sync?since={next_batch_token}&timeout=30000",
+            access_token=bob_access_token,
+            # Start the request, then continue on.
+            await_result=False,
+        )
+
+        # Have alice update their device list
+        channel = self.make_request(
+            "PUT",
+            f"/devices/{test_device_id}",
+            {
+                "display_name": "New Device Name",
+            },
+            access_token=alice_access_token,
+        )
+        self.assertEqual(channel.code, 200, channel.json_body)
+
+        # Check that bob's incremental sync contains the updated device list.
+        # If not, the client would only receive the device list update on the
+        # *next* sync.
+        bob_sync_channel.await_result()
+        self.assertEqual(bob_sync_channel.code, 200, bob_sync_channel.json_body)
+
+        changed_device_lists = bob_sync_channel.json_body.get("device_lists", {}).get(
+            "changed", []
+        )
+        self.assertIn(alice_user_id, changed_device_lists, bob_sync_channel.json_body)
+
+    def test_not_receiving_local_device_list_changes(self):
+        """Tests a local users DO NOT receive device updates from each other if they do not
+        share a room.
+        """
+        # Register two users
+        test_device_id = "TESTDEVICE"
+        alice_user_id = self.register_user("alice", "correcthorse")
+        alice_access_token = self.login(
+            alice_user_id, "correcthorse", device_id=test_device_id
+        )
+
+        bob_user_id = self.register_user("bob", "ponyponypony")
+        bob_access_token = self.login(bob_user_id, "ponyponypony")
+
+        # These users do not share a room. They are lonely.
+
+        # Have Bob initiate an initial sync (in order to get a since token)
+        channel = self.make_request(
+            "GET",
+            "/sync",
+            access_token=bob_access_token,
+        )
+        self.assertEqual(channel.code, 200, channel.json_body)
+        next_batch_token = channel.json_body["next_batch"]
+
+        # ...and then an incremental sync. This should block until the sync stream is woken up,
+        # which we hope will happen as a result of Alice updating their device list.
+        bob_sync_channel = self.make_request(
+            "GET",
+            f"/sync?since={next_batch_token}&timeout=1000",
+            access_token=bob_access_token,
+            # Start the request, then continue on.
+            await_result=False,
+        )
+
+        # Have alice update their device list
+        channel = self.make_request(
+            "PUT",
+            f"/devices/{test_device_id}",
+            {
+                "display_name": "New Device Name",
+            },
+            access_token=alice_access_token,
+        )
+        self.assertEqual(channel.code, 200, channel.json_body)
+
+        # Check that bob's incremental sync does not contain the updated device list.
+        bob_sync_channel.await_result()
+        self.assertEqual(bob_sync_channel.code, 200, bob_sync_channel.json_body)
+
+        changed_device_lists = bob_sync_channel.json_body.get("device_lists", {}).get(
+            "changed", []
+        )
+        self.assertNotIn(
+            alice_user_id, changed_device_lists, bob_sync_channel.json_body
+        )
diff --git a/tests/rest/client/utils.py b/tests/rest/client/utils.py
index 1c0cb0cf4f..2b3fdadffa 100644
--- a/tests/rest/client/utils.py
+++ b/tests/rest/client/utils.py
@@ -106,9 +106,13 @@ class RestHelper:
                 default room version.
             tok: The access token to use in the request.
             expect_code: The expected HTTP response code.
+            extra_content: Extra keys to include in the body of the /createRoom request.
+                Note that if is_public is set, the "visibility" key will be overridden.
+                If room_version is set, the "room_version" key will be overridden.
+            custom_headers: HTTP headers to include in the request.
 
         Returns:
-            The ID of the newly created room.
+            The ID of the newly created room, or None if the request failed.
         """
         temp_id = self.auth_user_id
         self.auth_user_id = room_creator