diff --git a/tests/rest/admin/test_room.py b/tests/rest/admin/test_room.py
index a0f32c5512..7e89eb4793 100644
--- a/tests/rest/admin/test_room.py
+++ b/tests/rest/admin/test_room.py
@@ -1430,6 +1430,54 @@ class JoinAliasRoomTestCase(unittest.HomeserverTestCase):
self.assertEquals(200, int(channel.result["code"]), msg=channel.result["body"])
self.assertEqual(private_room_id, channel.json_body["joined_rooms"][0])
+ def test_context(self):
+ """
+ Test that, as admin, we can find the context of an event without having joined the room.
+ """
+
+ # Create a room. We're not part of it.
+ user_id = self.register_user("test", "test")
+ user_tok = self.login("test", "test")
+ room_id = self.helper.create_room_as(user_id, tok=user_tok)
+
+ # Populate the room with events.
+ events = []
+ for i in range(30):
+ events.append(
+ self.helper.send_event(
+ room_id, "com.example.test", content={"index": i}, tok=user_tok
+ )
+ )
+
+ # Now let's fetch the context for this room.
+ midway = (len(events) - 1) // 2
+ channel = self.make_request(
+ "GET",
+ "/_synapse/admin/v1/rooms/%s/context/%s"
+ % (room_id, events[midway]["event_id"]),
+ access_token=self.admin_user_tok,
+ )
+ self.assertEquals(200, int(channel.result["code"]), msg=channel.result["body"])
+ self.assertEquals(
+ channel.json_body["event"]["event_id"], events[midway]["event_id"]
+ )
+
+ for i, found_event in enumerate(channel.json_body["events_before"]):
+ for j, posted_event in enumerate(events):
+ if found_event["event_id"] == posted_event["event_id"]:
+ self.assertTrue(j < midway)
+ break
+ else:
+ self.fail("Event %s from events_before not found" % j)
+
+ for i, found_event in enumerate(channel.json_body["events_after"]):
+ for j, posted_event in enumerate(events):
+ if found_event["event_id"] == posted_event["event_id"]:
+ self.assertTrue(j > midway)
+ break
+ else:
+ self.fail("Event %s from events_after not found" % j)
+
class MakeRoomAdminTestCase(unittest.HomeserverTestCase):
servlets = [
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