No, test payments should never be made on Production. All payments processed through our Production Environment are treated as valid transactions, so test payments using dummy cards will fail. We recommend using our Staging Environment instead at https://stage-go.wepay.com. This is an exact copy of our Production Environment, except that credit cards and bank accounts are not actually charged.
You can find more information here: https://www.wepay.com/developer/reference/testing