1 files changed, 18 insertions, 0 deletions
diff --git a/tests/rest/client/test_rooms.py b/tests/rest/client/test_rooms.py
index aa2f578441..c7eb88d33f 100644
--- a/tests/rest/client/test_rooms.py
+++ b/tests/rest/client/test_rooms.py
@@ -3461,3 +3461,21 @@ class ThreepidInviteTestCase(unittest.HomeserverTestCase):
 
         # Also check that it stopped before calling _make_and_store_3pid_invite.
         make_invite_mock.assert_called_once()
+
+    def test_400_missing_param_without_id_access_token(self) -> None:
+        """
+        Test that a 3pid invite request returns 400 M_MISSING_PARAM
+        if we do not include id_access_token.
+        """
+        channel = self.make_request(
+            method="POST",
+            path="/rooms/" + self.room_id + "/invite",
+            content={
+                "id_server": "example.com",
+                "medium": "email",
+                "address": "teresa@example.com",
+            },
+            access_token=self.tok,
+        )
+        self.assertEqual(channel.code, 400)
+        self.assertEqual(channel.json_body["errcode"], "M_MISSING_PARAM")