};

  #[test]
  fn from_transaction_returns_none_if_decipher_returns_error() {
    assert_eq!(
      Runestone::from_transaction(&Transaction {
        input: Vec::new(),
        output: vec![TxOut {
          script_pubkey: ScriptBuf::from_bytes(vec![opcodes::all::OP_PUSHBYTES_4.to_u8()]),
          value: 0,
        }],
        lock_time: locktime::absolute::LockTime::ZERO,
        version: 0,
      }),
      None
    );
  }

  #[test]
  fn deciphering_transaction_with_no_outputs_returns_none() {
    assert_eq!(
      Runestone::decipher(&Transaction {
        input: Vec::new(),
        output: Vec::new(),
        lock_time: locktime::absolute::LockTime::ZERO,
        version: 0,
      }),
      Ok(None)
    );
  }

  #[test]
  fn deciphering_transaction_with_non_op_return_output_returns_none() {
    assert_eq!(
      Runestone::decipher(&Transaction {
        input: Vec::new(),
        output: vec![TxOut {
          script_pubkey: script::Builder::new().push_slice([]).into_script(),
          value: 0
        }],