@GwtIncompatible
@ElementTypesAreNonnullByDefault
public class UncheckedTimeoutException extends RuntimeException {
  public UncheckedTimeoutException() {}

  public UncheckedTimeoutException(@CheckForNull String message) {
    super(message);
  }

  public UncheckedTimeoutException(@CheckForNull Throwable cause) {
    super(cause);
  }

  public UncheckedTimeoutException(@CheckForNull String message, @CheckForNull Throwable cause) {

    SampleImpl target = new SampleImpl(9999);
    Sample proxy = service.newProxy(target, Sample.class, NOT_ENOUGH_MS, MILLISECONDS);
    Stopwatch stopwatch = Stopwatch.createStarted();

    assertThrows(UncheckedTimeoutException.class, () -> proxy.sleepThenReturnInput("x"));

    assertThat(stopwatch.elapsed(MILLISECONDS)).isIn(Range.closed(NOT_ENOUGH_MS, DELAY_MS * 2));
    // Is it still computing away anyway?