public function testDataFileCacheDecrement()
{
$frontCache = new Phalcon\Cache\Frontend\Data();
$cache = new Phalcon\Cache\Backend\File($frontCache, array('cacheDir' => 'unit-tests/cache/'));
$cache->delete('foo');
$cache->save('foo', "100");
$this->assertEquals(99, $cache->decrement('foo'));
$this->assertEquals(95, $cache->decrement('foo', 4));
}