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-rw-r--r--tests/handlers/test_device.py47
1 files changed, 47 insertions, 0 deletions
diff --git a/tests/handlers/test_device.py b/tests/handlers/test_device.py
index 55a4f95ef3..9659a4a355 100644
--- a/tests/handlers/test_device.py
+++ b/tests/handlers/test_device.py
@@ -30,6 +30,7 @@ from synapse.server import HomeServer
 from synapse.storage.databases.main.appservice import _make_exclusive_regex
 from synapse.types import JsonDict, create_requester
 from synapse.util import Clock
+from synapse.util.task_scheduler import TaskScheduler
 
 from tests import unittest
 from tests.unittest import override_config
@@ -49,6 +50,7 @@ class DeviceTestCase(unittest.HomeserverTestCase):
         assert isinstance(handler, DeviceHandler)
         self.handler = handler
         self.store = hs.get_datastores().main
+        self.device_message_handler = hs.get_device_message_handler()
         return hs
 
     def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
@@ -211,6 +213,51 @@ class DeviceTestCase(unittest.HomeserverTestCase):
         )
         self.assertIsNone(res)
 
+    def test_delete_device_and_big_device_inbox(self) -> None:
+        """Check that deleting a big device inbox is staged and batched asynchronously."""
+        DEVICE_ID = "abc"
+        sender = "@sender:" + self.hs.hostname
+        receiver = "@receiver:" + self.hs.hostname
+        self._record_user(sender, DEVICE_ID, DEVICE_ID)
+        self._record_user(receiver, DEVICE_ID, DEVICE_ID)
+
+        # queue a bunch of messages in the inbox
+        requester = create_requester(sender, device_id=DEVICE_ID)
+        for i in range(0, DeviceHandler.DEVICE_MSGS_DELETE_BATCH_LIMIT + 10):
+            self.get_success(
+                self.device_message_handler.send_device_message(
+                    requester, "message_type", {receiver: {"*": {"val": i}}}
+                )
+            )
+
+        # delete the device
+        self.get_success(self.handler.delete_devices(receiver, [DEVICE_ID]))
+
+        # messages should be deleted up to DEVICE_MSGS_DELETE_BATCH_LIMIT straight away
+        res = self.get_success(
+            self.store.db_pool.simple_select_list(
+                table="device_inbox",
+                keyvalues={"user_id": receiver},
+                retcols=("user_id", "device_id", "stream_id"),
+                desc="get_device_id_from_device_inbox",
+            )
+        )
+        self.assertEqual(10, len(res))
+
+        # wait for the task scheduler to do a second delete pass
+        self.reactor.advance(TaskScheduler.SCHEDULE_INTERVAL_MS / 1000)
+
+        # remaining messages should now be deleted
+        res = self.get_success(
+            self.store.db_pool.simple_select_list(
+                table="device_inbox",
+                keyvalues={"user_id": receiver},
+                retcols=("user_id", "device_id", "stream_id"),
+                desc="get_device_id_from_device_inbox",
+            )
+        )
+        self.assertEqual(0, len(res))
+
     def test_update_device(self) -> None:
         self._record_users()