*/
    void assertCompletionNotExpected(long timeout) {
      Preconditions.checkArgument(timeout < expectedCompletionWaitMillis);
      assertAtLeastTimePassed(stopwatch, timeout);
      assertTimeNotPassed(stopwatch, expectedCompletionWaitMillis);
    }
  }

  private static void assertAtLeastTimePassed(Stopwatch stopwatch, long expectedMillis) {
    long elapsedMillis = stopwatch.elapsed(MILLISECONDS);
    /*

    private final Lock lock = new ReentrantLock();

    private final Map<Long, ContendedAction> contendedActions = new HashMap<>();
    private final Map<Long, FileLockReleasedSignal> lockReleasedSignals = new HashMap<>();
    private final Map<Long, Integer> unlocksRequestedFrom = new HashMap<>();
    private final Map<Long, Integer> unlocksConfirmedFrom = new HashMap<>();

    private final ExecutorFactory executorFactory;

   * provided.
   */
  static final class Cell {
    volatile long p0, p1, p2, p3, p4, p5, p6;
    volatile long value;
    volatile long q0, q1, q2, q3, q4, q5, q6;

    Cell(long x) {
      value = x;
    }

    final boolean cas(long cmp, long val) {
      return UNSAFE.compareAndSwapLong(this, valueOffset, cmp, val);
    }

    // Unsafe mechanics

   * provided.
   */
  static final class Cell {
    volatile long p0, p1, p2, p3, p4, p5, p6;
    volatile long value;
    volatile long q0, q1, q2, q3, q4, q5, q6;

    Cell(long x) {
      value = x;
    }

    final boolean cas(long cmp, long val) {
      return UNSAFE.compareAndSwapLong(this, valueOffset, cmp, val);
    }

    // Unsafe mechanics

   * provided.
   */
  static final class Cell {
    volatile long p0, p1, p2, p3, p4, p5, p6;
    volatile long value;
    volatile long q0, q1, q2, q3, q4, q5, q6;

    Cell(long x) {
      value = x;
    }

    final boolean cas(long cmp, long val) {
      return UNSAFE.compareAndSwapLong(this, valueOffset, cmp, val);
    }

    // Unsafe mechanics

          int splitCharacteristics,
          long estSplitSize);
    }

    @Weak @CheckForNull OutSpliteratorT prefix;
    final Spliterator<InElementT> from;
    final Function<? super InElementT, @Nullable OutSpliteratorT> function;
    final Factory<InElementT, OutSpliteratorT> factory;
    int characteristics;
    long estimatedSize;

    FlatMapSpliterator(

   * provided.
   */
  static final class Cell {
    volatile long p0, p1, p2, p3, p4, p5, p6;
    volatile long value;
    volatile long q0, q1, q2, q3, q4, q5, q6;

    Cell(long x) {
      value = x;
    }

    final boolean cas(long cmp, long val) {
      return UNSAFE.compareAndSwapLong(this, valueOffset, cmp, val);
    }

    // Unsafe mechanics

  //             TreeSubSetTest.suite());
  //     }

  public static long SHORT_DELAY_MS;
  public static long SMALL_DELAY_MS;
  public static long MEDIUM_DELAY_MS;
  public static long LONG_DELAY_MS;

  /**
   * Returns the shortest timed delay. This could be reimplemented to use for example a Property.
   */
  protected long getShortDelay() {
    return 50;
  }

        }

        @Override
        void maybeFlushOutput(long eventTimestamp) {
            if (timeoutExpired(eventTimestamp, HIGH_WATERMARK_FLUSH_TIMEOUT) || (timeoutExpired(eventTimestamp, LOW_WATERMARK_FLUSH_TIMEOUT) && canClaimForeground())) {
                flushOutput();
            }
        }

        private boolean timeoutExpired(long eventTimestamp, long timeout) {

    val body: ResponseBody =
      object : ResponseBody() {
        override fun contentType(): MediaType? {
          return null
        }

        override fun contentLength(): Long {
          return 5
        }

        override fun source(): BufferedSource {
          val source = Buffer().writeUtf8("hello")
          return object : ForwardingSource(source) {