public function testDelete()
{
$key = 'delete_key';
$data = 'data to delete';
$keys = array($key);
$time = strtotime('+1 minute');
$result = $this->_redis->set($key, $data);
$this->assertTrue($result);
$result = $this->redis->delete($keys);
$this->assertTrue($result);
$this->assertEqual(0, $this->_redis->delete($key));
}