conftest: add uses_pexpect mark

[blueyed]

Pulled out of #5313 - is this something we want to have?

[blueyed]

I think a generic feature like -k using_fixture(foo), or --using-fixture foo would be better.

[nicoddemus]

I would add a quick description here 👍

[blueyed]

Well, it is rather self-explaining, isn't it?

[blueyed]

Ok, done - also added a new "slowest_items" category.

[nicoddemus]

--using-fixture foo would be better.

Yep, I've seen the need for this myself... should we open a new issue for it?

[blueyed]

Yep, I've seen the need for this myself... should we open a new issue for it?

Yeah.

[blueyed]

Marking WIP to not merge it yet - there is no use for it currently really, given that we're likely to change the pexpect factor for CI (#5313, it would make sense to use -m uses_pexpect if jobs are being kept separate).