You can void a test user's transactions so that if he "bought" something it will appear as if it was never bought. So for in-app purchases, for example, roChannelStore->GetPurchases() would return the test user's purchases and then if you voided one GetPurchases() would no longer show that item as being purchased. I use it to make sure I have the logic correct for purchases and possible refunds (which seem to occur occasionally according to my "Account Activity"). I guess you could also use it to take away a game you gave to your friend via making him a test user who is no longer your friend (and then remove him from your test users).
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