message: add missing test function
  closes
diff: @@ -354,6 +354,10 @@ pub mod tests {
  .collect()
  }
  + pub fn sample(n: u32, ratio: f64) -> Vec<u32> {
  + sample_with_seed(n, ratio, 4)
  + }
  +
  #[test]
  #[cfg(not(feature = "lz4"))]
  fn test_version_string() {
  