public function testDecrement()
{
$key = 'decrement';
$value = 10;
$result = $this->_redis->set($key, $value);
$this->assertTrue($result);
$result = $this->redis->decrement($key);
$this->assertEqual($value - 1, $result);
$result = $this->_redis->get($key);
$this->assertEqual($value - 1, $result);
$result = $this->_redis->delete($key);
$this->assertEqual(1, $result);
}