Elastica\Request::setConnection PHP Method

    public function setConnection(Connection $connection)
    {
        $this->_connection = $connection;
        return $this;
    }

 /**
  * @group unit
  * @expectedException \Elastica\Exception\ConnectionException
  */
 public function testInvalidConnection()
 {
     $connection = new Connection(array('port' => 9999));
     $request = new Request('_stats', Request::GET);
     $request->setConnection($connection);
     // Throws exception because no valid connection
     $request->send();
 }