public function testHosts()
{
$hosts = ['127.0.0.1' => 2181];
$zookeeper = new Zookeeper($hosts);
$this->assertEquals($hosts, $zookeeper->getHosts());
$this->assertEquals('127.0.0.1:2181', $zookeeper->getHostsString());
$zookeeper->addHost('168.192.1.14');
$hosts['168.192.1.14'] = 2181;
$this->assertEquals($hosts, $zookeeper->getHosts());
$this->assertEquals('127.0.0.1:2181,168.192.1.14:2181', $zookeeper->getHostsString());
}