it.only("set validator valances", function () {
    this.timeout(0);
    const originalState = state.getOriginalState();
    // cache hashTreeRoot
    config.types.BeaconState.hashTreeRoot(originalState);
    const balances = Array.from({length: originalState.validators.length}, () => BigInt(31217089836));
    let minTime = Number.MAX_SAFE_INTEGER;
    let maxTime = 0;
    let average = {duration: 0, count: 0};
    const MAX_TRY = 10000;
    for (let i = 0; i < MAX_TRY; i++) {
      const state = config.types.BeaconState.clone(originalState);
      state.balances = balances as List<Gwei>;
      const start = Date.now();
      config.types.BeaconState.hashTreeRoot(state);
      const duration = Date.now() - start;
      const totalDuration = average.duration * average.count + duration;
      const totalCount = average.count + 1;
      average.count = totalCount;
      average.duration = totalDuration / totalCount;
      if (duration < minTime) minTime = duration;
      if (duration > maxTime) maxTime = duration;
    }
    console.log("hashTreeRoot minTime:", minTime, "maxTime:", maxTime, "average:", average.duration, "MAX_TRY:", MAX_TRY);
  });