I am working on adding In-App purchases to my app.
I am able to receive the productsRequest:didReceiveResponse method, and receive the array of products
I had had the same problem, first of all I haven't created test account so I created via getting help from this link https://developer.apple.com/library/ios/documentation/LanguagesUtilities/Conceptual/iTunesConnect_Guide/Chapters/SettingUpUserAccounts.html#//apple_ref/doc/uid/TP40011225-CH25-SW10
Then You need to sign out from your current account on your device. and buy purchasing it will ask for user account, then enter the test account.