SecurityError: localStorage is not available for opaque origins

[sebge-1]

This part of the tests throws up the error in the title:
tictactoe.js attachListeners() passes the clicked-on <td> element to doTurn():

Apparently it's to do with changes to jest and can be fixed by adding testURL: 'http://localhost' to the jest config file somewhere in node_modules...if you can find it!

Thread here:

jestjs/jest#6766