3.0.1: pytest is failing in `src/greenlet/tests/test_greenlet.py::TestGreenlet::test_dealloc_catches_GreenletExit_throws_other` unit

[kloczek]

I'm packaging your module as an rpm package so I'm using the typical PEP517 based build, install and test cycle used on building packages from non-root account.

• python3 -sBm build -w --no-isolation
• because I'm calling build with --no-isolation I'm using during all processes only locally installed modules
• install .whl file in </install/prefix> using 'installer` module
• run pytest with $PYTHONPATH pointing to sitearch and sitelib inside </install/prefix>
• build is performed in env which is cut off from access to the public network (pytest is executed with -m "not network")

Here is pytest output:

```console + PYTHONPATH=/home/tkloczko/rpmbuild/BUILDROOT/python-greenlet-3.0.1-2.fc35.x86_64/usr/lib64/python3.8/site-packages:/home/tkloczko/rpmbuild/BUILDROOT/python-greenlet-3.0.1-2.fc35.x86_64/usr/lib/python3.8/site-packages + /usr/bin/pytest -ra -m 'not network' --import-mode=importlib ==================================================================================== test session starts ==================================================================================== platform linux -- Python 3.8.18, pytest-7.4.3, pluggy-1.3.0 rootdir: /home/tkloczko/rpmbuild/BUILD/greenlet-3.0.1 collected 137 items src/greenlet/tests/test_contextvars.py .........s [ 7%] src/greenlet/tests/test_cpp.py ..... [ 10%] src/greenlet/tests/test_extension_interface.py ........... [ 18%] src/greenlet/tests/test_gc.py .... [ 21%] src/greenlet/tests/test_generator.py . [ 22%] src/greenlet/tests/test_generator_nested.py ..... [ 26%] src/greenlet/tests/test_greenlet.py ...F.............................................................. [ 74%] src/greenlet/tests/test_greenlet_trash.py . [ 75%] src/greenlet/tests/test_leaks.py ............ [ 83%] src/greenlet/tests/test_stack_saved.py . [ 84%] src/greenlet/tests/test_throw.py ....... [ 89%] src/greenlet/tests/test_tracing.py .......... [ 97%] src/greenlet/tests/test_version.py . [ 97%] src/greenlet/tests/test_weakref.py ... [100%] ========================================================================================= FAILURES ========================================================================================== ________________________________________________________________ TestGreenlet.test_dealloc_catches_GreenletExit_throws_other ________________________________________________________________ self = def test_dealloc_catches_GreenletExit_throws_other(self): def run(): try: greenlet.getcurrent().parent.switch() except greenlet.GreenletExit: raise SomeError from None g = RawGreenlet(run) g.switch() # Destroying the only reference to the greenlet causes it # to get GreenletExit; when it in turn raises, even though we're the parent # we don't get the exception, it just gets printed. # When we run on 3.8 only, we can use sys.unraisablehook oldstderr = sys.stderr try: from cStringIO import StringIO except ImportError: from io import StringIO stderr = sys.stderr = StringIO() try: del g finally: sys.stderr = oldstderr v = stderr.getvalue() > self.assertIn("Exception", v) E AssertionError: 'Exception' not found in '' src/greenlet/tests/test_greenlet.py:215: AssertionError ===================================================================================== warnings summary ====================================================================================== src/greenlet/tests/test_greenlet.py::TestGreenlet::test_dealloc_catches_GreenletExit_throws_other /usr/lib/python3.8/site-packages/_pytest/unraisableexception.py:78: PytestUnraisableExceptionWarning: Exception ignored in: Traceback (most recent call last): File "/home/tkloczko/rpmbuild/BUILD/greenlet-3.0.1/src/greenlet/tests/test_greenlet.py", line 195, in run raise SomeError from None src.greenlet.tests.test_greenlet.SomeError warnings.warn(pytest.PytestUnraisableExceptionWarning(msg)) -- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html ================================================================================== short test summary info ================================================================================== SKIPPED [1] src/greenlet/tests/test_contextvars.py:288: ContextVar supported FAILED src/greenlet/tests/test_greenlet.py::TestGreenlet::test_dealloc_catches_GreenletExit_throws_other - AssertionError: 'Exception' not found in '' =================================================================== 1 failed, 135 passed, 1 skipped, 1 warning in 56.60s ==================================================================== ```

Here is list of installed modules in build env

```console Package Version ----------------------------- ------- alabaster 0.7.13 Babel 2.13.1 build 1.0.0 charset-normalizer 3.3.1 cppclean 0.13 distro 1.8.0 docutils 0.20.1 exceptiongroup 1.1.3 gpg 1.22.0 idna 3.4 imagesize 1.4.1 importlib-metadata 6.8.0 iniconfig 2.0.0 installer 0.7.0 Jinja2 3.1.2 MarkupSafe 2.1.3 objgraph 3.6.0 packaging 23.2 pluggy 1.3.0 psutil 5.9.5 Pygments 2.16.1 pyproject_hooks 1.0.0 pytest 7.4.3 python-dateutil 2.8.2 pytz 2023.3 requests 2.31.0 setuptools 68.2.2 six 1.16.0 snowballstemmer 2.2.0 Sphinx 7.1.2 sphinxcontrib-applehelp 1.0.4 sphinxcontrib-devhelp 1.0.2 sphinxcontrib-htmlhelp 2.0.4 sphinxcontrib-jsmath 1.0.1 sphinxcontrib-qthelp 1.0.3 sphinxcontrib-serializinghtml 1.1.9 tomli 2.0.1 urllib3 1.26.18 wheel 0.41.2 zipp 3.17.0 ```

[jamadden]

pytest is not a supported way to test this project.