public function testIncrement()
{
$time = strtotime('+1 minute');
$key = 'increment';
$value = 10;
$this->assertTrue($this->_conn->set($key, $value, $time));
$result = $this->memcache->increment($key);
$this->assertEqual($value + 1, $result);
$this->assertEqual($value + 1, $this->_conn->get($key));
$result = $this->_conn->delete($key);
$this->assertTrue($result);
}