I\'m working on a In App Store on my app, I used AndroidBillingLibrary by robotmedia, when I purchase android.test.purchased using the library the
As was said by Rawkode, you no longer get signatures for test purchases (android.test.*). I took the dive and uploaded my app to the market place (just didn't publish it) using my real products.
Low and behold signatures started to be returned! I recommend amending any server side validation you are using to skip the signature check when the data contains an android.test.* item id.