public function testListAddresses()
 {
     if (empty(self::$serverId)) {
         $this->markTestSkipped('The server ID is empty');
     }
     $addresses = $this->compute->listAddresses(self::$serverId);
     $this->assertTrue(is_array($addresses));
     $this->assertTrue(isset($addresses['addresses']));
     $this->assertTrue(isset($addresses['addresses']['public']));
     $this->assertTrue(isset($addresses['addresses']['private']));
 }