Test amount ? you want to do give away right  ..
It's no hard thing just like fiat wallets payment system, once you make mistake with the wrong account number then it is gone..
One of the few things I mentioned above is what you can do..since you can't identify such person using their  address unlike  the Fiat system where you can go to your bank to make complaint and they can trace whichever person you sent the money to and probably force him to send it back if its a huge amount..