lock_time: locktime::absolute::LockTime::ZERO,
        version: 0,
      }),
      Ok(None)
    );
  }

  #[test]
  fn deciphering_transaction_with_bare_op_return_returns_none() {
    assert_eq!(
      Runestone::decipher(&Transaction {
        input: Vec::new(),
        output: vec![TxOut {
          script_pubkey: script::Builder::new()
            .push_opcode(opcodes::all::OP_RETURN)
            .into_script(),
          value: 0
        }],
        lock_time: locktime::absolute::LockTime::ZERO,
        version: 0,
      }),
      Ok(None)
    );
  }

  #[test]
  fn deciphering_transaction_with_non_matching_op_return_returns_none() {
    assert_eq!(
      Runestone::decipher(&Transaction {
        input: Vec::new(),
        output: vec![TxOut {
          script_pubkey: script::Builder::new()
            .push_opcode(opcodes::all::OP_RETURN)
            .push_slice(b"FOOO")
            .into_script(),
          value: 0
        }],
        lock_time: locktime::absolute::LockTime::ZERO,
        version: 0,