)
    .select_outgoing()
    .unwrap()
    .align_outgoing()
    .add_value()
    .unwrap()
    .strip_value()
    .deduct_fee()
    .build()
    .unwrap();
  }

  #[test]
  #[should_panic(expected = "invariant: sat is at first position in recipient output")]
  fn invariant_sat_is_aligned() {
    let utxos = vec![(outpoint(1), Amount::from_sat(10_000))];

    TransactionBuilder::new(
      satpoint(1, 3_333),
      BTreeMap::new(),
      utxos.into_iter().collect(),
      BTreeSet::new(),
      recipient(),
      [change(0), change(1)],
      FeeRate::try_from(1.0).unwrap(),
      Target::Postage,
    )
    .select_outgoing()
    .unwrap()
    .strip_value()
    .deduct_fee()
    .build()
    .unwrap();
  }

  #[test]
  #[should_panic(expected = "invariant: fee estimation is correct")]
  fn invariant_fee_is_at_least_target_fee_rate() {
    let utxos = vec![(outpoint(1), Amount::from_sat(10_000))];

    TransactionBuilder::new(
      satpoint(1, 0),
      BTreeMap::new(),
      utxos.into_iter().collect(),