@Override
    public String toString() {
        return "ReplicatedRecord{"
                + "key=" + key
                + ", value=" + value
                + ", ttlMillis=" + ttlMillis
                + ", hits=" + HITS.get(this)
                + ", creationTime=" + creationTime
                + ", lastAccessTime=" + lastAccessTime
                + ", updateTime=" + updateTime
                + '}';
    }
@Test
    public void testToString() {
        assertNotNull(replicatedRecord.toString());
    }