assertThrows(IllegalArgumentException.class, () -> builder.refreshAfterWrite(0, SECONDS));
  }

  @GwtIncompatible // Duration
  public void testRefresh_zero_duration() {
    CacheBuilder<Object, Object> builder = CacheBuilder.newBuilder();
    assertThrows(IllegalArgumentException.class, () -> builder.refreshAfterWrite(Duration.ZERO));
  }