text: INVALID_USER_ID = 0
  
  with frontend.signin("alice"):
      frontend.operation(
          "addreviewfilters",
          data={ "review_id": 1,
                 "filters": [{ "type": "watcher",
                               "user_ids": [INVALID_USER_ID],
                               "paths": ["/"] }] },
          expect={ "status": "failure",
                   "code": "invaliduserid" })
  