Replying to Testing bindings

Keep in mind this is all just for shits info that I'm wondering about, so don't give me the speech about my knees!

So I found an old pair of bindings that I might keep around to throw on some old urbans a friend of mine has.  I want to know about testing to make sure they release properly though.  I know a shop has a machine, but is there a good way to do a quick check on your own?  What if a binding doesn't let go at the DIN it's supposed to?  A shop won't keep them on there for liability, but is there a reasonably safe process to go through to fix the problem?  Any info would be nice, thanks in advance.