// select smallest utxo >= 104
    select_cardinal_utxo_prefer_under_helper(Amount::from_sat(104), false, Amount::from_sat(104));

    // select smallest utxo >= 1_000
    select_cardinal_utxo_prefer_under_helper(
      Amount::from_sat(1000),
      false,
      Amount::from_sat(10_000),
    );

    // select smallest utxo >= 100_000, else biggest < 100_000
    select_cardinal_utxo_prefer_under_helper(
      Amount::from_sat(100_000),
      false,
      Amount::from_sat(20_000),
    );
  }

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

    let fee_rate = FeeRate::try_from(17.3).unwrap();

    let transaction = TransactionBuilder::new(
      satpoint(1, 0),
      BTreeMap::from([(satpoint(1, 0), inscription_id(1))]),
      utxos.into_iter().collect(),
      BTreeSet::new(),
      recipient(),
      [change(0), change(1)],
      fee_rate,
      Target::ExactPostage(Amount::from_sat(66_000)),
    )
    .build_transaction()
    .unwrap();