Comment 10 for bug 1893274

> It's a little tricky to test for this, because you either need to have an old account lying around (as new ACMEv1 accounts can't be created anymore), or modify a boulder instance and then run that.

Ah. I see the issue. If it's not too difficult then instructions on setting up and modifying a boulder instance would be useful. If that seems unreasonably awkward, then we can be pragmatic and just do the best we can. Perhaps we could manually modify a configuration to the old endpoint and check that it (locally) redirects the configuration to the new endpoint, for example.