message: Add requested test (no commit/no rollback)
diff: @@ -116,6 +116,19 @@ mod test {
  assert_eq!(base.get(b"subtx"), None);
  }
  + #[test]
  + fn ignore_same_as_rollback() {
  + let mut base = MockStorage::new();
  + base.set(b"foo", b"bar");
  +
  + let mut check = StorageTransaction::new(&mut base);
  + assert_eq!(check.get(b"foo"), Some(b"bar".to_vec()));
  + check.set(b"subtx", b"works");
  +
  + assert_eq!(base.get(b"subtx"), None);
  + }
  +
  +
  #[test]
  fn transactional_works() {
  let mut base = MockStorage::new();
  