assertThat(f.get()).isEqualTo(2);
  }

  @J2ktIncompatible
  @GwtIncompatible // withTimeout
  public void testWithTimeout() throws Exception {
    ScheduledExecutorService executor = newScheduledThreadPool(1);
    try {
      FluentFuture<?> f =
          FluentFuture.from(SettableFuture.create()).withTimeout(0, SECONDS, executor);
      ExecutionException e = assertThrows(ExecutionException.class, () -> f.get());

  @GwtIncompatible // ScheduledExecutorService
  @IgnoreJRERequirement // Users will use this only if they're already using Duration.
  public final FluentFuture<V> withTimeout(
      Duration timeout, ScheduledExecutorService scheduledExecutor) {
    return withTimeout(toNanosSaturated(timeout), TimeUnit.NANOSECONDS, scheduledExecutor);
  }

  /**
   * Returns a future that delegates to this future but will finish early (via a {@link

  @IgnoreJRERequirement // Users will use this only if they're already using Duration.
  public static <V extends @Nullable Object> ListenableFuture<V> withTimeout(
      ListenableFuture<V> delegate, Duration time, ScheduledExecutorService scheduledExecutor) {
    return withTimeout(delegate, toNanosSaturated(time), TimeUnit.NANOSECONDS, scheduledExecutor);
  }

  /**