message: Modifying unit test and clarifying comment
diff: @@ -267,12 +267,12 @@ mod tests {
  value: StoredValue::CLValue(CLValue::from_t(2_i32).unwrap()),
  },
  TestPair {
  - key: Key::Account(AccountHash::new(
  - [2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8,
  - 1_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8,
  + key: Key::Account(AccountHash::new([
  + 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8,
  + 2_u8, 1_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8,
  // ^^^^ Is 1_u8 not 2_u8! (makes an extension node to pointer not leaf)
  - 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8,
  - 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, ])),
  + 2_u8, 2_u8, 2_u8, 2_u8, 2_u8, 2_u8,
  + ])),
  value: StoredValue::CLValue(CLValue::from_t(2_i32).unwrap()),
  },
  ]
  