check pytest summary - do not merge

[mathause]

I am trying to figure out why my other package gives multiline output in the pytest short summary on GHA. It should not and I was not able to reproduce it locally, and it seems not to do that on the xarray repo (checking old failed runs). But to be sure I open this dummy PR to see if that is actually true. Sorry for the spam.

=========================== short test summary info ============================
FAILED regionmask/tests/test_test.py::test_a - AssertionError: a long
  multiline
eason
assert False
FAILED regionmask/tests/test_test.py::test_b - ValueError: another
multiline	hingy
FAILED regionmask/tests/test_test.py::test_c - AssertionError: 
Not equal to tolerance rtol=1e-07, atol=0

Mismatched elements: 1 / 1 (100%)
Max absolute difference: 1
Max relative difference: 0.5
 x: array(1)
 y: array(2)
====== 3 failed, 881 passed, 22 skipped, 1 xfailed, 30 warnings in 38.21s ======

[keewis]

pytest has stopped truncating in CI for a while now. I believe that only happens if the CI or BUILD_NUMBER environment variables are set? Does GHA set these by default?

[mathause]

Yes that's it

export CI=1
pytest .

triggers the output. Thanks a ton - that was driving me crazy! 🙇‍♂️

[mathause]

It's since pytest 7.2.0 (2022-10-23) so that's indeed a moment (the CI env var was added around 2020 on GHA). Slightly surprised I never noticed that before...