From 09b4a4b6ab688fafa997abfe38d2064eec1617d7 Mon Sep 17 00:00:00 2001
From: Eric Eastwood <erice@element.io>
Date: Tue, 7 Sep 2021 15:52:59 -0500
Subject: [PATCH] Add tests to verify ?chunk_id actually corresponds to an
 insertion event that exists

Add tests for:

 - https://github.com/matrix-org/synapse/pull/10776
---
 tests/msc2716_test.go | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/tests/msc2716_test.go b/tests/msc2716_test.go
index ee4e9ac1..96ff9c20 100644
--- a/tests/msc2716_test.go
+++ b/tests/msc2716_test.go
@@ -345,6 +345,29 @@ func TestBackfillingHistory(t *testing.T) {
 			)
 		})
 
+		t.Run("Unrecognised chunk_id will throw an error", func(t *testing.T) {
+			t.Parallel()
+
+			roomID := as.CreateRoom(t, createPublicRoomOpts)
+			alice.JoinRoom(t, roomID, nil)
+
+			eventIDsBefore := createMessagesInRoom(t, alice, roomID, 1)
+			eventIdBefore := eventIDsBefore[0]
+			timeAfterEventBefore := time.Now()
+
+			batchSendHistoricalMessages(
+				t,
+				as,
+				roomID,
+				eventIdBefore,
+				"XXX_DOES_NOT_EXIST_CHUNK_ID",
+				createJoinStateEventsForBackfillRequest([]string{virtualUserID}, timeAfterEventBefore),
+				createMessageEventsForBackfillRequest([]string{virtualUserID}, timeAfterEventBefore, 1),
+				// Status
+				400,
+			)
+		})
+
 		t.Run("Normal users aren't allowed to backfill messages", func(t *testing.T) {
 			t.Parallel()