0.4.27: pytest is failing

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>
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-magic-0.4.27-4.fc35.x86_64/usr/lib64/python3.8/site-packages:/home/tkloczko/rpmbuild/BUILDROOT/python-magic-0.4.27-4.fc35.x86_64/usr/lib/python3.8/site-packages + /usr/bin/pytest -ra -m 'not network' ==================================================================================== test session starts ==================================================================================== platform linux -- Python 3.8.16, pytest-7.2.2, pluggy-1.0.0 rootdir: /home/tkloczko/rpmbuild/BUILD/python-magic-0.4.27 collected 20 items test/libmagic_test.py ... [ 15%] test/python_magic_test.py ..F...........ss. [100%] ========================================================================================= FAILURES ========================================================================================== _________________________________________________________________________________ MagicTest.test_extension __________________________________________________________________________________ self = def test_extension(self): try: m = magic.Magic(extension=True) > self.assert_values(m, { # some versions return '' for the extensions of a gz file, # including w/ the command line. Who knows... 'test.gz': ('gz/tgz/tpz/zabw/svgz', '', '???'), 'name_use.jpg': 'jpeg/jpg/jpe/jfif', }) test/python_magic_test.py:134: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ test/python_magic_test.py:53: in assert_values self.assertIn(value, expected_value) E AssertionError: 'gz/tgz/tpz/zabw/svgz/adz/kmy/xcfgz' not found in ('gz/tgz/tpz/zabw/svgz', '', '???') ===================================================================================== warnings summary ====================================================================================== test/libmagic_test.py::MagicTestCase::test_detect_from_content test/libmagic_test.py::MagicTestCase::test_detect_from_filename test/libmagic_test.py::MagicTestCase::test_detect_from_fobj /home/tkloczko/rpmbuild/BUILD/python-magic-0.4.27/magic/__init__.py:437: PendingDeprecationWarning: Using compatibility mode with libmagic's python binding. See https://github.com/ahupp/python-magic/blob/master/COMPAT.md for details. warnings.warn( -- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html ================================================================================== short test summary info ================================================================================== SKIPPED [1] test/python_magic_test.py:143: Magic file doesn't return expected type. SKIPPED [1] test/python_magic_test.py:153: Magic file doesn't return expected type. FAILED test/python_magic_test.py::MagicTest::test_extension - AssertionError: 'gz/tgz/tpz/zabw/svgz/adz/kmy/xcfgz' not found in ('gz/tgz/tpz/zabw/svgz', '', '???') ==================================================================== 1 failed, 17 passed, 2 skipped, 3 warnings in 0.14s ==================================================================== ```

Here is list of installed modules in build env

```console Package Version --------------- -------------- attrs 22.2.0 build 0.10.0 distro 1.8.0 exceptiongroup 1.0.0 gpg 1.18.0-unknown iniconfig 2.0.0 libcomps 0.1.19 packaging 23.0 pip 23.0.1 pluggy 1.0.0 pyproject_hooks 1.0.0 pytest 7.2.2 python-dateutil 2.8.2 rpm 4.17.0 setuptools 65.6.3 six 1.16.0 tomli 2.0.1 wheel 0.38.4 ```

ahupp / python-magic

0.4.27: pytest is failing #285