public function testDataFileCacheIncrement()
{
$frontCache = new Phalcon\Cache\Frontend\Data();
$cache = new Phalcon\Cache\Backend\File($frontCache, array('cacheDir' => 'unit-tests/cache/'));
$cache->delete('foo');
$cache->save('foo', "1");
$this->assertEquals(2, $cache->increment('foo'));
$this->assertEquals($cache->get('foo'), 2);
$this->assertEquals($cache->increment('foo', 5), 7);
}