Support for pytest 7.0.0?

[pnkraemer]

Hi,

Thanks a lot for coming up with a very useful package!

I was wondering: do you plan on on adding support for the newest pytest release? (7.0.0, https://github.com/pytest-dev/pytest/releases). I know I am super early, pytest 7 is quite fresh and I understand that there hasnt been a chance to update pytest-cases.
Part of the reasoning behind this issue is that I stay up-to-date on potential updates on this front :)

The issue

Currently, version 3.6.8 does not work with pytest 7 when parametrising cases.
I know that pytest-cases does not support pytest 7 officially (yet?), but if you want a MWE to reproduce some issues that come up in my application, see below.

To reproduce

(Patched together from https://docs.pytest.org/en/7.0.x/getting-started.html)

import pytest_cases
import pytest

def foo(a, b):
    return a + 1, b + 1

@pytest_cases.parametrize("x", (2,))  # the culprit
def case_two_positive_ints(x):
    """ Inputs are two positive integers """
    return 1, x


def case_two_negative_ints():
    """ Inputs are two negative integers """
    return -1, -2


@pytest_cases.parametrize_with_cases("a,b", cases=".")
def test_foo(a, b):
    assert isinstance(foo(a, b), tuple)

The above works with (pip freeze)

attrs==21.4.0
decopatch==1.4.8
iniconfig==1.1.1
makefun==1.13.1
more-itertools==8.12.0
packaging==21.3
pluggy==0.13.1
py==1.11.0
pyparsing==3.0.7
pytest==6.2.5  # old pytest
pytest-cases==3.6.8
toml==0.10.2
tomli==2.0.0

but does not work with

attrs==21.4.0
decopatch==1.4.8
iniconfig==1.1.1
makefun==1.13.1
more-itertools==8.12.0
packaging==21.3
pluggy==0.13.1
py==1.11.0
pyparsing==3.0.7
pytest==7.0.0  # new pytest
pytest-cases==3.6.8
toml==0.10.2
tomli==2.0.0

It raises the following error:

Thanks a lot!

If it helps: I can make a PR if pointed to the correct place.

[bhazelton]

We are seeing similar errors on our pyuvdata package (https://github.com/RadioAstronomySoftwareGroup/pyuvdata).

[smarie]

Thanks for reporting @pnkraemer ! I'll ship a fix very shortly based on @jammer87 's PR

[smarie]

3.6.9 is now released with the fix. Thanks !