trigger deprecation warning for py.test cli command

[RonnyPfannschmidt]

we provide a dropthedot variant since a good while now, in order to support the transition we should trigger a deprecationwarning

[nicoddemus]

TBH I don't think we should deprecate/remove py.test at all, for the reason that it is not a maintenance burden for us (1 line of code), and removing it will break old scripts without a good reason.

IMHO we should deprecate/remove old implementations/APIs that are:

1. A maintenance burden for us;
2. Bad practices (message parameter of pytest.raises);
3. Confusing terminology (getfuncargvalue vs getfixturevalue).

It doesn't really matter if users use py.test in old scripts after all. We just recommend the new pytest command in the docs, and that's it.

Same goes for yield_fixture IMO.

What do you think?

[blueyed]

I agree with @nicoddemus.
py.test is still used a lot.

[Zac-HD]

Closing this as wontfix; while we all prefer the new form there's little to gain from deprecating the old.