List<String> liveKeysAsOrderedList() {
    return new ArrayList<String>(liveMap.keySet());
  }
@Test
  public void empty1() {
    long now = 3000;
    assertNotNull(tracker.getOrCreate(key, now++));
    now += ComponentTracker.DEFAULT_TIMEOUT + 1000;
    tracker.removeStaleComponents(now);
    assertEquals(0, tracker.liveKeysAsOrderedList().size());
    assertEquals(0, tracker.getComponentCount());

    assertNotNull(tracker.getOrCreate(key, now++));
  }