Add tests for charge failure and gateway error for dummy gateway
Add tests for charge failure and gateway error for dummy gateway


mociepka/saleor,maferelo/saleor,UITools/saleor,mociepka/saleor,UITools/saleor,maferelo/saleor,maferelo/saleor,mociepka/saleor,UITools/saleor,UITools/saleor,UITools/saleor