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++));
    }