public function testWriteDefaultCacheExpiry() {
		$redis = new Redis(array('expiry' => '+5 seconds'));
		$key = 'default_key';
		$data = 'value';
		$time = strtotime('+5 seconds');

		$closure = $redis->write($key, $data);
		$this->assertTrue(is_callable($closure));

		$params = compact('key', 'data');
		$result = $closure($redis, $params, null);
		$expected = $data;
		$this->assertEqual($expected, $result);

		$result = $this->_redis->get($key);
		$this->assertEqual($expected, $result);

		$result = $this->_redis->ttl($key);
		$this->assertEqual($time - time(), $result);

		$result = $this->_redis->delete($key);
		$this->assertTrue($result);
	}