message: Remove useless test code.
diff: @@ -48,15 +48,6 @@ where
  {
  s.serialize_u64(x.as_millis() as u64)
  }
  -#[derive(Deserialize, Serialize, Debug)]
  -struct Track {
  - #[serde(
  - deserialize_with = "from_duration_ms",
  - serialize_with = "to_duration_ms",
  - rename = "duration_ms"
  - )]
  - duration: Duration,
  -}
  /// Restriction object
  ///
  /// [Reference](https://developer.spotify.com/documentation/web-api/reference/object-model/#track-restriction-object)
  