@Test
  public void testScheduleCallable() throws Exception {
    assertThat(submitted.getCount()).isZero();

    assertThat(running.getCount()).isZero();
    assertThat(completed.getCount()).isZero();
    assertThat(duration.getCount()).isZero();

    assertThat(scheduledOnce.getCount()).isZero();
    assertThat(scheduledRepetitively.getCount()).isZero();
    assertThat(scheduledOverrun.getCount()).isZero();
    assertThat(percentOfPeriod.getCount()).isZero();

    final Object obj = new Object();

    ScheduledFuture<Object> theFuture =
        instrumentedScheduledExecutor.schedule(
            new Callable<Object>() {
              public Object call() {
                assertThat(submitted.getCount()).isZero();

                assertThat(running.getCount()).isEqualTo(1);
                assertThat(completed.getCount()).isZero();
                assertThat(duration.getCount()).isZero();

                assertThat(scheduledOnce.getCount()).isEqualTo(1);
                assertThat(scheduledRepetitively.getCount()).isZero();
                assertThat(scheduledOverrun.getCount()).isZero();
                assertThat(percentOfPeriod.getCount()).isZero();

                return obj;
              }
            },
            10L,
            TimeUnit.MILLISECONDS);

    assertThat(theFuture.get()).isEqualTo(obj);

    assertThat(submitted.getCount()).isZero();

    assertThat(running.getCount()).isZero();
    assertThat(completed.getCount()).isEqualTo(1);
    assertThat(duration.getCount()).isEqualTo(1);
    assertThat(duration.getSnapshot().size()).isEqualTo(1);

    assertThat(scheduledOnce.getCount()).isEqualTo(1);
    assertThat(scheduledRepetitively.getCount()).isZero();
    assertThat(scheduledOverrun.getCount()).isZero();
    assertThat(percentOfPeriod.getCount()).isZero();
  }
  @Test
  public void testScheduleRunnable() throws Exception {
    assertThat(submitted.getCount()).isZero();

    assertThat(running.getCount()).isZero();
    assertThat(completed.getCount()).isZero();
    assertThat(duration.getCount()).isZero();

    assertThat(scheduledOnce.getCount()).isZero();
    assertThat(scheduledRepetitively.getCount()).isZero();
    assertThat(scheduledOverrun.getCount()).isZero();
    assertThat(percentOfPeriod.getCount()).isZero();

    ScheduledFuture<?> theFuture =
        instrumentedScheduledExecutor.schedule(
            new Runnable() {
              public void run() {
                assertThat(submitted.getCount()).isZero();

                assertThat(running.getCount()).isEqualTo(1);
                assertThat(completed.getCount()).isZero();
                assertThat(duration.getCount()).isZero();

                assertThat(scheduledOnce.getCount()).isEqualTo(1);
                assertThat(scheduledRepetitively.getCount()).isZero();
                assertThat(scheduledOverrun.getCount()).isZero();
                assertThat(percentOfPeriod.getCount()).isZero();
              }
            },
            10L,
            TimeUnit.MILLISECONDS);

    theFuture.get();

    assertThat(submitted.getCount()).isZero();

    assertThat(running.getCount()).isZero();
    assertThat(completed.getCount()).isEqualTo(1);
    assertThat(duration.getCount()).isEqualTo(1);
    assertThat(duration.getSnapshot().size()).isEqualTo(1);

    assertThat(scheduledOnce.getCount()).isEqualTo(1);
    assertThat(scheduledRepetitively.getCount()).isZero();
    assertThat(scheduledOverrun.getCount()).isZero();
    assertThat(percentOfPeriod.getCount()).isZero();
  }