assert!(FeeRate::try_from(f64::INFINITY).is_err());
    assert!(FeeRate::try_from(f64::NAN).is_err());
  }

  #[test]
  fn fee() {
    assert_eq!(
      "2.5".parse::<FeeRate>().unwrap().fee(100),
      Amount::from_sat(250)
    );
    assert_eq!(
      "2.0".parse::<FeeRate>().unwrap().fee(1024),
      Amount::from_sat(2048)
    );
    assert_eq!(
      "1.1".parse::<FeeRate>().unwrap().fee(100),
      Amount::from_sat(110)
    );
    assert_eq!(
      "1.0".parse::<FeeRate>().unwrap().fee(123456789),
      Amount::from_sat(123456789)
    );
  }
}