@Override
    public long getCreationTime() {
        return creationTime;
    }
@Test
    public void testCreationTime() {
        long beforeCreationTime = Clock.currentTimeMillis();
        LocalSetStatsImpl localSetStats = createTestStats();
        long afterCreationTime = Clock.currentTimeMillis();

        assertBetween("creationTime", localSetStats.getCreationTime(), beforeCreationTime, afterCreationTime);
    }