abstract void cancelFinalStepAndWait(ClosingFuture<TestCloseable> closingFuture);

  /**
   * Marks the given step final and waits for it to fail. Expects the failure exception to match
   * {@link AbstractClosingFutureTest#exception}.
   */
  abstract void assertFinallyFailsWithException(ClosingFuture<?> closingFuture);

  abstract void cancelFinalStepAndWait(ClosingFuture<TestCloseable> closingFuture);

  /**
   * Marks the given step final and waits for it to fail. Expects the failure exception to match
   * {@link AbstractClosingFutureTest#exception}.
   */
  abstract void assertFinallyFailsWithException(ClosingFuture<?> closingFuture);

  }

  /**
   * Returns a future that delegates to another but will finish early (via a {@link
   * TimeoutException} wrapped in an {@link ExecutionException}) if the specified duration expires.
   *
   * <p>The delegate future is interrupted and cancelled if it times out.
   *
   * @param delegate The future to delegate to.
   * @param unit the time unit of the time parameter