[37/38] - Test Driven Wallpaper Delete - Part 2

Video write up + code = https://codereviewvideos.com/course/let-s-build-a-wallpaper-website-in-symfony-3/video/test-driven-wallpaper-delete-part-2 We are continuing with our test-driven (PhpSpec) approach to Deleting an existing uploaded Wallpaper, and making sure the associated image gets deleted too.