);
  }

  #[test]
  fn change_addresses_must_be_unique() {
    pretty_assert_eq!(
      TransactionBuilder::new(
        satpoint(1, 0),
        BTreeMap::new(),
        vec![(outpoint(1), Amount::from_sat(1000))]
          .into_iter()
          .collect(),
        BTreeSet::new(),
        recipient(),
        [change(0), change(0)],
        FeeRate::try_from(0.0).unwrap(),
        Target::Value(Amount::from_sat(1000))
      )
      .build_transaction(),
      Err(Error::DuplicateAddress(change(0)))
    );
  }

  #[test]
  fn output_over_value_because_fees_prevent_excess_value_stripping() {
    pretty_assert_eq!(
      TransactionBuilder::new(
        satpoint(1, 0),
        BTreeMap::new(),
        vec![(outpoint(1), Amount::from_sat(2000))]
          .into_iter()
          .collect(),
        BTreeSet::new(),
        recipient(),
        [change(0), change(1)],
        FeeRate::try_from(2.0).unwrap(),
        Target::Value(Amount::from_sat(1500))
      )
      .build_transaction(),
      Ok(Transaction {