for i in 0..start / COIN_VALUE {
      writeln!(tsv, "{}", i * COIN_VALUE).expect("writing to string should succeed");
    }

    let start = Instant::now();
    assert_eq!(
      sats_from_tsv(utxos, &tsv)
        .unwrap()
        .into_iter()
        .map(|(outpoint, s)| (outpoint, s.parse().unwrap()))
        .collect::<Vec<(OutPoint, u64)>>(),
      results
    );

    assert!(Instant::now() - start < Duration::from_secs(10));
  }
}