    @Test
    public void propertyIndexRange() {

        List<TopicModelImpl> topics;
        topics = db.fetchTopicsByPropertyRange("score", 1L, 1000L);  assertEquals(3, topics.size());
        topics = db.fetchTopicsByPropertyRange("score", 23L, 23L);   assertEquals(2, topics.size());
        topics = db.fetchTopicsByPropertyRange("score", 23L, 1234L); assertEquals(4, topics.size());
    }