pytest-xdist newer version 1.22.4 seems to be broken

[cauvery]

I am seeing below error all of a sudden, nothing changed from my last run. Suspected if that is caused by pytest-xdist newer version 1.22.4
_pytest.vendored_packages.pluggy.PluginValidationError: Plugin 'xdist' could not be loaded:

pytest-xdist = 1.22.4
python 2.7

Thank you,
Cauvery

[pytestbot]

GitMate.io thinks possibly related issues are #340 (xdist breaks inspect.stack()), #707 (pytest-xdist regression since execnet 1.3.0), #734 (Release pytest-xdist), #1980 (.), and #2851 (..).

[nicoddemus]

Hi @cauvery,

Sorry to hear about that, could you please post the full output?

[cauvery]

The issue occurred with pytest-xdist=1.22.4 and pytest=3.2.5 .
And is fixed by updating pytest to 3.4 or more.

@nicoddemus here is the full output
_pytest.vendored_packages.pluggy.PluginValidationError: Plugin 'xdist' could not be loaded: (pytest 3.2.5 (/home/myworkspace/.tox/py27/lib/python2.7/site-packages), Requirement.parse('pytest>=3.4'))!

Should the new version pytest-xdist=1.22.4 be compatible with pytest=3.2.5 ?

Thank you,
Cauvery.

[nicoddemus]

Yeah 1.22.4 dropped support for pytest<3.4. In retrospect that was a mistake on my part, because we shouldn't change requirements in bug-fix releases.

Anyway, the underlying cause seems to be that pip's dependency solver has known problems, because 1.22.4 correctly declares the pytest>=3.5 dependency:

https://github.com/pytest-dev/pytest-xdist/blob/3776f3b74b73fedc4a74c1dc6acf893bd7fb7d67/setup.py#L3