}

  #[test]
  fn is_common() {
    #[track_caller]
    fn case(n: u64) {
      assert_eq!(Sat(n).is_common(), Sat(n).rarity() == Rarity::Common);
    }

    case(0);
    case(1);
    case(50 * COIN_VALUE - 1);
    case(50 * COIN_VALUE);
    case(50 * COIN_VALUE + 1);
    case(2067187500000000 - 1);
    case(2067187500000000);
    case(2067187500000000 + 1);
  }

  #[test]
  fn nineball() {
    for height in 0..10 {
      let sat = Sat(height * 50 * COIN_VALUE);
      assert_eq!(
        sat.nineball(),
        sat.height() == 9,
        "nineball: {} height: {}",
        sat.nineball(),
        sat.height()
      );
    }
  }
}