[24/38] - Testing The Wallpaper File Path Helper

More videos + write up - https://codereviewvideos.com/course/let-s-build-a-wallpaper-website-in-symfony-3/video/testing-the-wallpaper-file-path-helper We're going to need to know where to store our uploaded Wallpaper image files in the longer term. Let's create a Symfony service to figure this out for us.