}

  #[test]
  fn from_height() {
    assert_eq!(Epoch::from(Height(0)), 0);
    assert_eq!(Epoch::from(Height(SUBSIDY_HALVING_INTERVAL)), 1);
    assert_eq!(Epoch::from(Height(SUBSIDY_HALVING_INTERVAL) + 1), 1);
  }

  #[test]
  fn from_sat() {
    for (epoch, starting_sat) in Epoch::STARTING_SATS.into_iter().enumerate() {
      if epoch > 0 {
        assert_eq!(
          Epoch::from(Sat(starting_sat.n() - 1)),
          Epoch(u32::try_from(epoch).unwrap() - 1)
        );
      }
      assert_eq!(
        Epoch::from(starting_sat),
        Epoch(u32::try_from(epoch).unwrap())
      );
      assert_eq!(
        Epoch::from(starting_sat + 1),
        Epoch(u32::try_from(epoch).unwrap())
      );
    }
    assert_eq!(Epoch::from(Sat(0)), 0);
    assert_eq!(Epoch::from(Sat(1)), 0);
    assert_eq!(Epoch::from(Epoch(1).starting_sat()), 1);
    assert_eq!(Epoch::from(Epoch(1).starting_sat() + 1), 1);
    assert_eq!(Epoch::from(Sat(u64::max_value())), 33);
  }

  #[test]
  fn eq() {
    assert_eq!(Epoch(0), 0);
    assert_eq!(Epoch(100), 100);