message: update underflow test
diff: @@ -501,7 +501,7 @@ mod tests {
  "popularity": 10
  }"#);
  match json_err {
  - Err(DocParsingError::ValueError(_, ValueParsingError::TypeError(_))) => {
  + Err(DocParsingError::ValueError(_, ValueParsingError::OverflowError(_))) => {
  assert!(true);
  }
  _ => {
  