Add better test case for switching cart owner
Add better test case for switching cart owner

maferelo/saleor,KenMutemi/saleor,jreigel/saleor,mociepka/saleor,tfroehlich82/saleor,itbabu/saleor,UITools/saleor,itbabu/saleor,HyperManTT/ECommerceSaleor,maferelo/saleor,car3oon/saleor,KenMutemi/saleor,maferelo/saleor,UITools/saleor,jreigel/saleor,UITools/saleor,HyperManTT/ECommerceSaleor,jreigel/saleor,UITools/saleor,mociepka/saleor,HyperManTT/ECommerceSaleor,itbabu/saleor,car3oon/saleor,tfroehlich82/saleor,UITools/saleor,tfroehlich82/saleor,car3oon/saleor,mociepka/saleor,KenMutemi/saleor