}
        Some(_) => return Ok(None),
      }
    }
  }
}

#[cfg(test)]
mod tests {
  use {super::*, bitcoin::absolute::LockTime};

  fn parse(witnesses: &[Witness]) -> Vec<ParsedEnvelope> {
    ParsedEnvelope::from_transaction(&Transaction {
      version: 0,
      lock_time: LockTime::ZERO,
      input: witnesses
        .iter()
        .map(|witness| TxIn {
          previous_output: OutPoint::null(),
          script_sig: ScriptBuf::new(),
          sequence: Sequence::ENABLE_RBF_NO_LOCKTIME,
          witness: witness.clone(),
        })
        .collect(),
      output: Vec::new(),
    })
  }

  #[test]
  fn empty() {
    assert_eq!(parse(&[Witness::new()]), Vec::new())
  }

  #[test]
  fn ignore_key_path_spends() {
    assert_eq!(
      parse(&[Witness::from_slice(&[bitcoin::script::Builder::new()
        .push_opcode(bitcoin::opcodes::OP_FALSE)
        .push_opcode(bitcoin::opcodes::all::OP_IF)
        .push_slice(b"ord")
        .push_opcode(bitcoin::opcodes::all::OP_ENDIF)
        .into_script()