message: [pdsl_core] Add test for storage::vec::Iter::size_hint
diff: @@ -186,3 +186,10 @@ fn swap_remove_empty() {
  let mut vec = new_empty_vec();
  assert_eq!(vec.swap_remove(0), None);
  }
  +
  +#[test]
  +fn iter_size_hint() {
  + let vec = new_filled_vec();
  + let iter = vec.iter();
  + assert_eq!(iter.size_hint(), (4, Some(4)));
  +}
  