iPhone 5 with no screen, How can I check if it works?

I have purchased a second hand iPhone 5 with no screen at all. There is no home button or proximity sensor or earpiece or display. I can see all of the internals including the battery. How can i check if it turns on? I was planning on trying to get a screen for it but I don't want to waste money on a phone that doesn't work and never will work. It looks like the display had been forcefully ripped off of the phone. The ribbon that connects the display to the logic board is snapped and the screws at the bottom of the device have not been taken out.