Author: Daniele Alessandri (suppakilla@gmail.com)
Inheritance: implements ClusterInterface, implements IteratorAggregate, implements Countable
 /**
  * Constructor
  *
  * @param null|\Predis\Cluster\Distributor\DistributorInterface $distributor
  */
 public function __construct(DistributorInterface $distributor = null)
 {
     parent::__construct(new RandomDistributionStrategy());
 }
 /**
  * @group disconnected
  */
 public function testCanBeSerialized()
 {
     $connection1 = $this->getMockConnection('tcp://host1?alias=first');
     $connection2 = $this->getMockConnection('tcp://host2?alias=second');
     $cluster = new PredisCluster();
     $cluster->add($connection1);
     $cluster->add($connection2);
     // We use the following line to initialize the underlying hashring.
     $cluster->getConnectionByKey('foo');
     $unserialized = unserialize(serialize($cluster));
     $this->assertEquals($cluster, $unserialized);
 }