MD5 hashing and sharding fails about jedis HOT 2 CLOSED

@Test
public void testMD5Sharding() throws Exception {
    List<JedisShardInfo> shards = new ArrayList<JedisShardInfo>(3);
    shards.add(new JedisShardInfo("localhost", Protocol.DEFAULT_PORT));
    shards.add(new JedisShardInfo("localhost", Protocol.DEFAULT_PORT + 1));
    shards.add(new JedisShardInfo("localhost", Protocol.DEFAULT_PORT + 2));
    Sharded<Jedis, JedisShardInfo> sharded = new Sharded<Jedis, JedisShardInfo>(shards,
            Hashing.MD5);
    int shard_6379 = 0;
    int shard_6380 = 0;
    int shard_6381 = 0;
    for (int i = 0; i < 1000; i++) {
        JedisShardInfo jedisShardInfo = sharded.getShardInfo(Integer.toString(i));
        switch (jedisShardInfo.getPort()) {
        case 6379:
            shard_6379++;
            break;
        case 6380:
            shard_6380++;
            break;
        case 6381:
            shard_6381++;
            break;
        default:
            fail("Attempting to use a non-defined shard!!:" + jedisShardInfo);
            break;
        }
        // System.out.println("key=" + i + " shard=" + sharded.getShardInfo(Integer.toString(i)));
    }
    System.out.println("6379:" + shard_6379);
    System.out.println("6380:" + shard_6380);
    System.out.println("6381:" + shard_6381);
    assertTrue(shard_6379 > 300 && shard_6379 < 400);
    assertTrue(shard_6380 > 300 && shard_6380 < 400);
    assertTrue(shard_6381 > 300 && shard_6381 < 400);