public FakeTicker setAutoIncrementStep(Duration autoIncrementStep) {
    return setAutoIncrementStep(autoIncrementStep.toNanos(), NANOSECONDS);
  }

  @Override
  public long read() {
    return nanos.getAndAdd(autoIncrementStepNanos);
  }

   *
   * @param i the index
   * @param delta the value to add
   * @return the previous value
   */
  @CanIgnoreReturnValue
  public final double getAndAdd(int i, double delta) {
    return getAndAccumulate(i, delta, Double::sum);
  }

  /**
   * Atomically adds the given value to the element at index {@code i}.
   *
   * @param i the index