satpoint(1, 2),
      BTreeMap::new(),
      vec![(outpoint(1), Amount::from_sat(5))]
        .into_iter()
        .collect(),
      BTreeSet::new(),
      recipient(),
      [change(0), change(1)],
      FeeRate::try_from(1.0).unwrap(),
      Target::Postage,
    )
    .select_outgoing()
    .unwrap();

    builder.outputs[0].1 = Amount::from_sat(0);

    builder.build().unwrap();
  }

  #[test]
  fn excess_postage_is_stripped() {
    let utxos = vec![(outpoint(1), Amount::from_sat(1_000_000))];

    pretty_assert_eq!(
      TransactionBuilder::new(
        satpoint(1, 0),
        BTreeMap::new(),
        utxos.into_iter().collect(),
        BTreeSet::new(),
        recipient(),
        [change(0), change(1)],
        FeeRate::try_from(1.0).unwrap(),
        Target::Postage,
      )
      .build_transaction(),
      Ok(Transaction {
        version: 1,
        lock_time: LockTime::ZERO,
        input: vec![tx_in(outpoint(1))],
        output: vec![
          tx_out(TransactionBuilder::TARGET_POSTAGE.to_sat(), recipient()),