diff --git a/tests/rest/client/test_report_event.py b/tests/rest/client/test_report_event.py
index 1250685d39..b88f1d61a0 100644
--- a/tests/rest/client/test_report_event.py
+++ b/tests/rest/client/test_report_event.py
@@ -84,6 +84,48 @@ class ReportEventTestCase(unittest.HomeserverTestCase):
access_token=self.other_user_tok,
)
self.assertEqual(404, channel.code, msg=channel.result["body"])
+ self.assertEqual(
+ "Unable to report event: it does not exist or you aren't able to see it.",
+ channel.json_body["error"],
+ msg=channel.result["body"],
+ )
+
+ def test_cannot_report_event_if_not_in_room(self) -> None:
+ """
+ Tests that we don't accept event reports for events that exist, but for which
+ the reporter should not be able to view (because they are not in the room).
+ """
+ # Have the admin user create a room (the "other" user will not join this room).
+ new_room_id = self.helper.create_room_as(tok=self.admin_user_tok)
+
+ # Have the admin user send an event in this room.
+ response = self.helper.send_event(
+ new_room_id,
+ "m.room.message",
+ content={
+ "msgtype": "m.text",
+ "body": "This event has some bad words in it! Flip!",
+ },
+ tok=self.admin_user_tok,
+ )
+ event_id = response["event_id"]
+
+ # Have the "other" user attempt to report it. Perhaps they found the event ID
+ # in a screenshot or something...
+ channel = self.make_request(
+ "POST",
+ f"rooms/{new_room_id}/report/{event_id}",
+ {"reason": "I'm not in this room but I have opinions anyways!"},
+ access_token=self.other_user_tok,
+ )
+
+ # The "other" user is not in the room, so their report should be rejected.
+ self.assertEqual(404, channel.code, msg=channel.result["body"])
+ self.assertEqual(
+ "Unable to report event: it does not exist or you aren't able to see it.",
+ channel.json_body["error"],
+ msg=channel.result["body"],
+ )
def _assert_status(self, response_status: int, data: JsonDict) -> None:
channel = self.make_request(
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