public function testIncrement()
{
$time = strtotime('+1 minute') - time();
$key = 'increment';
$value = 10;
$result = xcache_set($key, $value, $time);
$this->assertTrue($result);
$result = $this->XCache->increment($key);
$this->assertEqual($value + 1, $result);
$result = xcache_get($key);
$this->assertEqual($value + 1, $result);
$result = xcache_unset($key);
$this->assertTrue($result);
}