message: Increase the number of roundtrip test iterations
diff: @@ -67,7 +67,7 @@ where
  let file =
  h5::File::with_options().mode("w").driver("core").filebacked(false).open(&filename)?;
  for ndim in 0..=4 {
  - for _ in 0..=5 {
  + for _ in 0..=30 {
  let arr: ArrayD<T> = gen_arr(&mut rng, ndim);
  println!("{:?}", arr.shape());
  