TYP: Type annotaion for test decorators

[ShaharNaveh]

• closes #xxxx
• tests added / passed
• passes black pandas
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

I am not 100% sure this is something we want, or at least with this implementation.

cc @simonjayhawkins

[pep8speaks]

Hello @MomIsBestFriend! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2020-01-30 15:52:49 UTC

[simonjayhawkins]

I am not 100% sure this is something we want, or at least with this implementation.

eventually.

typing was original done like this, but changed in #28134, since _pytest.mark.structures.MarkDecorator currently resolves to Any.

for the current status of typing in pytest see pytest-dev/pytest#3342

[ShaharNaveh]

I see that is related to #28133, I thought about helping there, but I don't know how to do it without stub files.

So I am closing this :)

sorry for your time @simonjayhawkins