If packaging doesn't normalise dependency names when stringifying dependencies, why does it normalise their extras? Anyway, the easiest thing to do here is to replace all underscores in extra names in the tests with hyphens.

@layday maybe it should? Sounds like worth filing issue on packaging.

This only affects extra names in markers, BTW, not square bracket extra selectors.

That sounds inconsistent enough to definitely warrant an upstream issue.

But those have to be consistent to make older packaging pass, since older packaging does not consider a-b to match a_b.

RtD is misbehaving today, also in pypa/packaging.

@henryiii is RtD supposed to work from forks at all?

RtD supposed to work from forks at all?

I think so. Never had a problem before. I think GH is finicky today.

Passes now, so yes. :)