Credit card for Google Play test

I don't want to input my credit card for Google Play test. Is there any way I can do this like what we did in iOS IAP testing?

Or is it possible to create Redeem code for testing?

The reason is I'm not feeling comfortable to add my Credit Card number. One of my friends once was stolen about $600 through Google wallet (although Google paid him back later).

Another bad case is my another friend received the bill from his Credit Card company to pay for the testing of Google Play's In App Billing although Google said it's safe to do so.(He told me he even saw "This is a test order, you will not be charged" when he did testing)

Thanks