diff --git a/tests/handlers/test_sliding_sync.py b/tests/handlers/test_sliding_sync.py
index f6b6d579ae..af48041f1f 100644
--- a/tests/handlers/test_sliding_sync.py
+++ b/tests/handlers/test_sliding_sync.py
@@ -1341,6 +1341,7 @@ class SortRoomsTestCase(HomeserverTestCase):
         # Create the rooms as user2 so we can have user1 with a clean slate to work from
         # and join in whatever order we need for the tests.
         room_id1 = self.helper.create_room_as(user2_id, tok=user2_tok, is_public=True)
+        # If we're testing knocks, set the room to knock
         if room1_membership == Membership.KNOCK:
             self.helper.send_state(
                 room_id1,
@@ -1352,6 +1353,7 @@ class SortRoomsTestCase(HomeserverTestCase):
         room_id3 = self.helper.create_room_as(user2_id, tok=user2_tok, is_public=True)
 
         # Here is the activity with user1 that will determine the sort of the rooms
+        # (room2, room1, room3)
         self.helper.join(room_id3, user1_id, tok=user1_tok)
         if room1_membership == Membership.LEAVE:
             self.helper.join(room_id1, user1_id, tok=user1_tok)
@@ -1364,7 +1366,7 @@ class SortRoomsTestCase(HomeserverTestCase):
             self.helper.ban(room_id1, src=user2_id, targ=user1_id, tok=user2_tok)
         self.helper.join(room_id2, user1_id, tok=user1_tok)
 
-        # Activity before the token but the user is only invited to this room so it
+        # Activity before the token but the user is only been xxx to this room so it
         # shouldn't be taken into account
         self.helper.send(room_id1, "activity in room1", tok=user2_tok)
 
diff --git a/tests/rest/client/test_sync.py b/tests/rest/client/test_sync.py
index bbc53b216d..2b06767b8a 100644
--- a/tests/rest/client/test_sync.py
+++ b/tests/rest/client/test_sync.py
@@ -1459,3 +1459,60 @@ class SlidingSyncTestCase(unittest.HomeserverTestCase):
             ],
             list(channel.json_body["lists"]["foo-list"]),
         )
+
+    def test_sort_list(self) -> None:
+        """
+        Test that the lists are sorted by `stream_ordering`
+        """
+        user1_id = self.register_user("user1", "pass")
+        user1_tok = self.login(user1_id, "pass")
+
+        room_id1 = self.helper.create_room_as(user1_id, tok=user1_tok, is_public=True)
+        room_id2 = self.helper.create_room_as(user1_id, tok=user1_tok, is_public=True)
+        room_id3 = self.helper.create_room_as(user1_id, tok=user1_tok, is_public=True)
+
+        # Activity that will order the rooms
+        self.helper.send(room_id3, "activity in room3", tok=user1_tok)
+        self.helper.send(room_id1, "activity in room1", tok=user1_tok)
+        self.helper.send(room_id2, "activity in room2", tok=user1_tok)
+
+        # Make the Sliding Sync request
+        channel = self.make_request(
+            "POST",
+            self.sync_endpoint,
+            {
+                "lists": {
+                    "foo-list": {
+                        "ranges": [[0, 99]],
+                        "required_state": [
+                            ["m.room.join_rules", ""],
+                            ["m.room.history_visibility", ""],
+                            ["m.space.child", "*"],
+                        ],
+                        "timeline_limit": 1,
+                    }
+                }
+            },
+            access_token=user1_tok,
+        )
+        self.assertEqual(channel.code, 200, channel.json_body)
+
+        # Make sure it has the foo-list we requested
+        self.assertListEqual(
+            list(channel.json_body["lists"].keys()),
+            ["foo-list"],
+            channel.json_body["lists"].keys(),
+        )
+
+        # Make sure the list is sorted in the way we expect
+        self.assertListEqual(
+            list(channel.json_body["lists"]["foo-list"]["ops"]),
+            [
+                {
+                    "op": "SYNC",
+                    "range": [0, 99],
+                    "room_ids": [room_id2, room_id1, room_id3],
+                }
+            ],
+            channel.json_body["lists"]["foo-list"],
+        )