@Override
          public Integer call() {
            taskDone = true;
            return 6;
          }
        };
    Future<Integer> future =
        TestingExecutors.sameThreadScheduledExecutor().schedule(task, 10000, TimeUnit.MILLISECONDS);
    assertTrue("Should run callable immediately", taskDone);
    assertEquals(6, (int) future.get());
  }

          @Override
          public Integer call() {
            taskDone = true;
            return 6;
          }
        };
    Future<Integer> future =
        TestingExecutors.sameThreadScheduledExecutor().schedule(task, 10000, TimeUnit.MILLISECONDS);
    assertTrue("Should run callable immediately", taskDone);
    assertEquals(6, (int) future.get());
  }

   * already have been executed.
   *
   * @since 32.0.0 (taking the place of a method with a different return type from 15.0)
   */
  @Beta
  public static ListeningScheduledExecutorService sameThreadScheduledExecutor() {
    return new SameThreadScheduledExecutorService();
  }

  private static final class NoOpScheduledExecutorService extends AbstractListeningExecutorService
      implements ListeningScheduledExecutorService {

   * already have been executed.
   *
   * @since 32.0.0 (taking the place of a method with a different return type from 15.0)
   */
  @Beta
  public static ListeningScheduledExecutorService sameThreadScheduledExecutor() {
    return new SameThreadScheduledExecutorService();
  }

  private static final class NoOpScheduledExecutorService extends AbstractListeningExecutorService
      implements ListeningScheduledExecutorService {