It is a cliched test that all serious promotion contenders must pass at some point: can they do it on a cold Tuesday night in Stoke?
League leaders Norwich survived a late scare and left the Potteries having passed that test, as a Teemu Pukki double added to Emi Buendia's opener to help Daniel Farke's men to a 3-2 win.
Cold night in Stoke it most definitely was. And that might explain why the Potters defence was frozen on their heels to deal with Norwich, who went ahead on 18 minutes after Buendia raced through and scuffed his shot past Joe Bursik.