I have problem with correctly print length of items (li) from ul.
First of all, I save a selectors with li items. Next i invoke length method.
But when i run my test i get undefined as length of li.

My code:

```
get numberOfBooks() {
        return $$("fieldset > div.suggest-list > ol.item-list > li")
    }

```

```
 async TitleBookIsVisible() {
        await expect(this.numberOfBooks).toBeVisible();
        console.log(this.numberOfBooks.length)
    }

```

Return: undefined

//selector is correct