Pytest 8: AttributeError: 'TestExpectedException' object has no attribute 'runTest'. Did you mean: 'subTest'?

[hrnciar]

Hello,

we are using pytest for running bandit and python-etcd3gw tests. Since pytest 8 the tests are failing with AttributeError: 'XXX' object has no attribute 'runTest'. Did you mean: 'subTest'?
See:

• https://download.copr.fedorainfracloud.org/results/thrnciar/pytest/fedora-rawhide-x86_64/07388287-bandit/builder-live.log.gz

• https://download.copr.fedorainfracloud.org/results/thrnciar/pytest/fedora-rawhide-x86_64/07424137-python-etcd3gw/builder-live.log.gz

Reproducer:

$ git clone git@github.com:testing-cabal/testtools.git
$ cd testtools
[testtools (master)]$ tox -e py312
...

[testtools (master)]$ .tox/py312/bin/pip install 'pytest>=8'
[testtools (master)]$ .tox/py312/bin/pytest testtools/tests
...
AttributeError: 'TestExpectedException' object has no attribute 'runTest'. Did you mean: 'subTest'?
11 warnings, 218 errors

[testtools (master)]$ .tox/py312/bin/pip install 'pytest<8'
[testtools (master)]$ .tox/py312/bin/pytest testtools/tests
...
38 failed, 1328 passed, 7 skipped, 2 xfailed, 59 warnings

[jelmer]

Please use either the test tools test runner or the native python test runner (unittest)

We're open to PRs that improve support for running the test with third party runners like pytest, but it's not a priority for the project.

[jelmer]

See also #332

[ncopa]

Details why this happens is found here pytest-dev/pytest#12263 (comment)