.collect(),
      BTreeSet::new(),
      recipient(),
      [change(0), change(1)],
      FeeRate::try_from(1.0).unwrap(),
      Target::Postage,
    )
    .build()
    .unwrap();
  }

  #[test]
  #[should_panic(expected = "invariant: outgoing sat is sent to recipient")]
  fn invariant_sat_is_sent_to_recipient() {
    let mut builder = TransactionBuilder::new(
      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].0 = "tb1qx4gf3ya0cxfcwydpq8vr2lhrysneuj5d7lqatw"
      .parse::<Address<NetworkUnchecked>>()
      .unwrap()
      .assume_checked();

    builder.build().unwrap();
  }

  #[test]
  #[should_panic(expected = "invariant: outgoing sat is found in outputs")]
  fn invariant_sat_is_found_in_outputs() {
    let mut builder = TransactionBuilder::new(