Phalcon\Test\Unit\Cache\Backend\ApcCest::queryKeys PHP Method

    public function queryKeys(UnitTester $I)
    {
        $I->wantTo('Get cache keys by using APC(u) as cache backend');
        $cache = new Apc(new Data(['lifetime' => 20]));
        $I->haveInApc(['_PHCAa' => 1, '_PHCAb' => 2, '_PHCAc' => 3], null);
        $keys = $cache->queryKeys();
        sort($keys);
        $I->assertEquals($keys, ['a', 'b', 'c']);
    }