Audio Test Files

Can someone help me find some speaker test files - as well as just some awesome sound files - that will work with my Vizio 5.1 Surround Sound System. My subwoofer and two rear speakers connect wirelessly. My problem is, all of the audio files and test files I've found thus far play only through the soundbar. Surely there must be some stuff out there that works with a system that uses wireless technology. I'd greatly appreciate any help I can get on this. Thanks!!