8.0.0: pytest is failing

[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:

Details

+ PYTHONPATH=/home/tkloczko/rpmbuild/BUILDROOT/python-sphinxcontrib-spelling-8.0.0-2.fc35.x86_64/usr/lib64/python3.8/site-packages:/home/tkloczko/rpmbuild/BUILDROOT/python-sphinxcontrib-spelling-8.0.0-2.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-7.3.1, pluggy-1.0.0
rootdir: /home/tkloczko/rpmbuild/BUILD/spelling-8.0.0
collected 6 items / 2 errors

========================================================================================== ERRORS ===========================================================================================
__________________________________________________________________________ ERROR collecting tests/test_builder.py ___________________________________________________________________________
ImportError while importing test module '/home/tkloczko/rpmbuild/BUILD/spelling-8.0.0/tests/test_builder.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/usr/lib64/python3.8/importlib/__init__.py:127: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
tests/test_builder.py:16: in <module>
    from tests import helpers  # isort:skip
E   ModuleNotFoundError: No module named 'tests'
___________________________________________________________________________ ERROR collecting tests/test_filter.py ___________________________________________________________________________
ImportError while importing test module '/home/tkloczko/rpmbuild/BUILD/spelling-8.0.0/tests/test_filter.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/usr/lib64/python3.8/importlib/__init__.py:127: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
tests/test_filter.py:16: in <module>
    from tests import helpers # isort:skip
E   ModuleNotFoundError: No module named 'tests'
================================================================================== short test summary info ==================================================================================
ERROR tests/test_builder.py
ERROR tests/test_filter.py
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Interrupted: 2 errors during collection !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
===================================================================================== 2 errors in 0.35s =====================================================================================

Here is list of installed modules in build env

Details

Package                       Version
----------------------------- -----------------
alabaster                     0.7.13
Babel                         2.12.1
build                         0.10.0
charset-normalizer            3.1.0
distro                        1.8.0
docutils                      0.19
exceptiongroup                1.0.0
fixtures                      4.0.1
gpg                           1.19.0
idna                          3.4
imagesize                     1.4.1
importlib-metadata            6.5.0
iniconfig                     2.0.0
installer                     0.7.0
Jinja2                        3.1.2
libcomps                      0.1.19
MarkupSafe                    2.1.2
packaging                     23.0
pbr                           5.11.1
pluggy                        1.0.0
pyenchant                     3.2.2
Pygments                      2.15.1
pyproject_hooks               1.0.0
pytest                        7.3.1
python-dateutil               2.8.2
pytz                          2023.2
requests                      2.28.2
setuptools                    67.6.1
setuptools-scm                7.1.0
six                           1.16.0
snowballstemmer               2.2.0
Sphinx                        6.1.3
sphinxcontrib-applehelp       1.0.4
sphinxcontrib-devhelp         1.0.2.dev20230415
sphinxcontrib-htmlhelp        2.0.0
sphinxcontrib-jsmath          1.0.1.dev20230415
sphinxcontrib-qthelp          1.0.3.dev20230415
sphinxcontrib-serializinghtml 1.1.5
sphinxcontrib-spelling        7.7.0
tomli                         2.0.1
typing_extensions             4.5.0
urllib3                       1.26.15
wheel                         0.40.0
zipp                          3.15.0

[kloczek]

gentle ping 🤔

[dhellmann]

What are the contents of the directory where you're running the tests.

The tox target isolated demonstrates how to run the tests outside of the source code directory.

[kloczek]

I'm executing pytest in source root directory.
Looks like tests/init.py is missing.
After create empty tests/init.py pytest is able to pass units scanning however it fails in some units

Here is pytest output:

+ PYTHONPATH=/home/tkloczko/rpmbuild/BUILDROOT/python-sphinxcontrib-spelling-8.0.0-2.fc36.x86_64/usr/lib64/python3.9/site-packages:/home/tkloczko/rpmbuild/BUILDROOT/python-sphinxcontrib-spelling-8.0.0-2.fc36.x86_64/usr/lib/python3.9/site-packages
+ /usr/bin/pytest -ra -m 'not network'
==================================================================================== test session starts ====================================================================================
platform linux -- Python 3.9.18, pytest-8.1.1, pluggy-1.4.0
rootdir: /home/tkloczko/rpmbuild/BUILD/spelling-8.0.0
configfile: pyproject.toml
plugins: mock-3.12.0
collected 67 items

tests/test_builder.py ...F......s....FFFF.FF..                                                                                                                                        [ 35%]
tests/test_checker.py FFFF..                                                                                                                                                          [ 44%]
tests/test_filter.py ....sssssssssssssssssssssssssss......                                                                                                                            [100%]

========================================================================================= FAILURES ==========================================================================================
___________________________________________________________________________________ test_ignore_literals ____________________________________________________________________________________

sphinx_project = (local('/tmp/pytest-of-tkloczko/pytest-66/test_ignore_literals0/src'), local('/tmp/pytest-of-tkloczko/pytest-66/test_ignore_literals0/out'))

    def test_ignore_literals(sphinx_project):
        srcdir, outdir = sphinx_project
        add_file(srcdir, 'contents.rst', '''
        Welcome to Spelling Checker documentation!
        ==========================================

        There are several misspelled words in this text.

        ::

            Literal blocks are ignoreed.

        Inline ``litterals`` are ignored, too.

        ''')
        stdout, stderr, output_text = get_sphinx_output(srcdir, outdir, 'contents')
        # The 'contents.spelling' output file should not have been
        # created, because the errors are ignored.
>       assert output_text is None
E       AssertionError: assert '../../../../../tmp/pytest-of-tkloczko/pytest-66/test_ignore_literals0/src/contents.rst:3: (Welcome)  Welcome to Spell...../../../../../tmp/pytest-of-tkloczko/pytest-66/test_ignore_literals0/src/contents.rst:11: (too)   are ignored, too.\n' is None

tests/test_builder.py:138: AssertionError
----------------------------------------------------------------------------------- Captured stderr call ------------------------------------------------------------------------------------
fatal: not a git repository (or any parent up to mount point /home/tkloczko)
Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).
------------------------------------------------------------------------------------- Captured log call -------------------------------------------------------------------------------------
WARNING  test.filters:filters.py:249 Called: git log --quiet --no-color --pretty=format:%(trailers:key=Co-Authored-By,separator=%x0A)%x0A%an%x0A%cn
WARNING  test.filters:filters.py:250 Failed to scan contributors: Command '['git', 'log', '--quiet', '--no-color', '--pretty=format:%(trailers:key=Co-Authored-By,separator=%x0A)%x0A%an%x0A%cn']' returned non-zero exit status 128.
___________________________________________________________________________________ test_legacy_directive ___________________________________________________________________________________

sphinx_project = (local('/tmp/pytest-of-tkloczko/pytest-66/test_legacy_directive0/src'), local('/tmp/pytest-of-tkloczko/pytest-66/test_legacy_directive0/out'))

    def test_legacy_directive(sphinx_project):
        srcdir, outdir = sphinx_project

        add_file(srcdir, 'contents.rst', '''
        The Module
        ==========

        .. spelling::

           teh

        teh is OK

        ''')

        stdout, stderr, output_text = get_sphinx_output(
            srcdir,
            outdir,
            'contents',
        )
>       assert output_text is None
E       AssertionError: assert '../../../../../tmp/pytest-of-tkloczko/pytest-66/test_legacy_directive0/src/contents.rst:3: (The)  The Module\n../../....e Module\n../../../../../tmp/pytest-of-tkloczko/pytest-66/test_legacy_directive0/src/contents.rst:9: (is)  teh is OK\n' is None

tests/test_builder.py:386: AssertionError
----------------------------------------------------------------------------------- Captured stderr call ------------------------------------------------------------------------------------
fatal: not a git repository (or any parent up to mount point /home/tkloczko)
Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).
------------------------------------------------------------------------------------- Captured log call -------------------------------------------------------------------------------------
WARNING  test.filters:filters.py:249 Called: git log --quiet --no-color --pretty=format:%(trailers:key=Co-Authored-By,separator=%x0A)%x0A%an%x0A%cn
WARNING  test.filters:filters.py:250 Failed to scan contributors: Command '['git', 'log', '--quiet', '--no-color', '--pretty=format:%(trailers:key=Co-Authored-By,separator=%x0A)%x0A%an%x0A%cn']' returned non-zero exit status 128.
___________________________________________________________________________________ test_domain_directive ___________________________________________________________________________________

sphinx_project = (local('/tmp/pytest-of-tkloczko/pytest-66/test_domain_directive0/src'), local('/tmp/pytest-of-tkloczko/pytest-66/test_domain_directive0/out'))

    def test_domain_directive(sphinx_project):
        srcdir, outdir = sphinx_project

        add_file(srcdir, 'contents.rst', '''
        The Module
        ==========

        .. spelling:word-list::

           teh

        teh is OK

        ''')

        stdout, stderr, output_text = get_sphinx_output(
            srcdir,
            outdir,
            'contents',
        )
>       assert output_text is None
E       AssertionError: assert '../../../../../tmp/pytest-of-tkloczko/pytest-66/test_domain_directive0/src/contents.rst:3: (The)  The Module\n../../....e Module\n../../../../../tmp/pytest-of-tkloczko/pytest-66/test_domain_directive0/src/contents.rst:9: (is)  teh is OK\n' is None

tests/test_builder.py:409: AssertionError
----------------------------------------------------------------------------------- Captured stderr call ------------------------------------------------------------------------------------
fatal: not a git repository (or any parent up to mount point /home/tkloczko)
Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).
------------------------------------------------------------------------------------- Captured log call -------------------------------------------------------------------------------------
WARNING  test.filters:filters.py:249 Called: git log --quiet --no-color --pretty=format:%(trailers:key=Co-Authored-By,separator=%x0A)%x0A%an%x0A%cn
WARNING  test.filters:filters.py:250 Failed to scan contributors: Command '['git', 'log', '--quiet', '--no-color', '--pretty=format:%(trailers:key=Co-Authored-By,separator=%x0A)%x0A%an%x0A%cn']' returned non-zero exit status 128.
_____________________________________________________________________________________ test_domain_role ______________________________________________________________________________________

sphinx_project = (local('/tmp/pytest-of-tkloczko/pytest-66/test_domain_role0/src'), local('/tmp/pytest-of-tkloczko/pytest-66/test_domain_role0/out'))

    def test_domain_role(sphinx_project):
        srcdir, outdir = sphinx_project

        add_file(srcdir, 'contents.rst', '''
        The Module
        ==========

        :spelling:word:`teh` is OK

        ''')

        stdout, stderr, output_text = get_sphinx_output(
            srcdir,
            outdir,
            'contents',
        )
>       assert output_text is None
E       AssertionError: assert '../../../../../tmp/pytest-of-tkloczko/pytest-66/test_domain_role0/src/contents.rst:3: (The)  The Module\n../../../../...ule)  The Module\n../../../../../tmp/pytest-of-tkloczko/pytest-66/test_domain_role0/src/contents.rst:5: (is)   is OK\n' is None

tests/test_builder.py:428: AssertionError
----------------------------------------------------------------------------------- Captured stderr call ------------------------------------------------------------------------------------
fatal: not a git repository (or any parent up to mount point /home/tkloczko)
Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).
------------------------------------------------------------------------------------- Captured log call -------------------------------------------------------------------------------------
WARNING  test.filters:filters.py:249 Called: git log --quiet --no-color --pretty=format:%(trailers:key=Co-Authored-By,separator=%x0A)%x0A%an%x0A%cn
WARNING  test.filters:filters.py:250 Failed to scan contributors: Command '['git', 'log', '--quiet', '--no-color', '--pretty=format:%(trailers:key=Co-Authored-By,separator=%x0A)%x0A%an%x0A%cn']' returned non-zero exit status 128.
______________________________________________________________________________ test_domain_role_multiple_words ______________________________________________________________________________

sphinx_project = (local('/tmp/pytest-of-tkloczko/pytest-66/test_domain_role_multiple_word0/src'), local('/tmp/pytest-of-tkloczko/pytest-66/test_domain_role_multiple_word0/out'))

    def test_domain_role_multiple_words(sphinx_project):
        srcdir, outdir = sphinx_project

        add_file(srcdir, 'contents.rst', '''
        The Module
        ==========

        :spelling:word:`teh is KO`

        ''')

        stdout, stderr, output_text = get_sphinx_output(
            srcdir,
            outdir,
            'contents',
        )
>       assert output_text is None
E       AssertionError: assert '../../../../../tmp/pytest-of-tkloczko/pytest-66/test_domain_role_multiple_word0/src/contents.rst:3: (The)  The Module..../../../../tmp/pytest-of-tkloczko/pytest-66/test_domain_role_multiple_word0/src/contents.rst:3: (Module)  The Module\n' is None

tests/test_builder.py:447: AssertionError
----------------------------------------------------------------------------------- Captured stderr call ------------------------------------------------------------------------------------
fatal: not a git repository (or any parent up to mount point /home/tkloczko)
Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).
------------------------------------------------------------------------------------- Captured log call -------------------------------------------------------------------------------------
WARNING  test.filters:filters.py:249 Called: git log --quiet --no-color --pretty=format:%(trailers:key=Co-Authored-By,separator=%x0A)%x0A%an%x0A%cn
WARNING  test.filters:filters.py:250 Failed to scan contributors: Command '['git', 'log', '--quiet', '--no-color', '--pretty=format:%(trailers:key=Co-Authored-By,separator=%x0A)%x0A%an%x0A%cn']' returned non-zero exit status 128.
____________________________________________________________________________________ test_domain_ignore _____________________________________________________________________________________

sphinx_project = (local('/tmp/pytest-of-tkloczko/pytest-66/test_domain_ignore0/src'), local('/tmp/pytest-of-tkloczko/pytest-66/test_domain_ignore0/out'))

    def test_domain_ignore(sphinx_project):
        srcdir, outdir = sphinx_project

        add_file(srcdir, 'contents.rst', '''
        The Module
        ==========

        :spelling:ignore:`baddddd` is OK

        ''')

        stdout, stderr, output_text = get_sphinx_output(
            srcdir,
            outdir,
            'contents',
        )
>       assert output_text is None
E       AssertionError: assert '../../../../../tmp/pytest-of-tkloczko/pytest-66/test_domain_ignore0/src/contents.rst:3: (The)  The Module\n../../../....e)  The Module\n../../../../../tmp/pytest-of-tkloczko/pytest-66/test_domain_ignore0/src/contents.rst:5: (is)   is OK\n' is None

tests/test_builder.py:494: AssertionError
----------------------------------------------------------------------------------- Captured stderr call ------------------------------------------------------------------------------------
fatal: not a git repository (or any parent up to mount point /home/tkloczko)
Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).
------------------------------------------------------------------------------------- Captured log call -------------------------------------------------------------------------------------
WARNING  test.filters:filters.py:249 Called: git log --quiet --no-color --pretty=format:%(trailers:key=Co-Authored-By,separator=%x0A)%x0A%an%x0A%cn
WARNING  test.filters:filters.py:250 Failed to scan contributors: Command '['git', 'log', '--quiet', '--no-color', '--pretty=format:%(trailers:key=Co-Authored-By,separator=%x0A)%x0A%an%x0A%cn']' returned non-zero exit status 128.
_____________________________________________________________________________ test_domain_ignore_multiple_words _____________________________________________________________________________

sphinx_project = (local('/tmp/pytest-of-tkloczko/pytest-66/test_domain_ignore_multiple_wo0/src'), local('/tmp/pytest-of-tkloczko/pytest-66/test_domain_ignore_multiple_wo0/out'))

    def test_domain_ignore_multiple_words(sphinx_project):
        srcdir, outdir = sphinx_project

        add_file(srcdir, 'contents.rst', '''
        The Module
        ==========

        :spelling:ignore:`baddddd` is OK here.

        But, baddddd is not OK here.
        Nor, here baddddd.

        ''')

        stdout, stderr, output_text = get_sphinx_output(
            srcdir,
            outdir,
            'contents',
        )
        assert '(baddddd)' in output_text
>       assert output_text.count('\n') == 2  # Only expect 2 errors, not 3.
E       AssertionError: assert 12 == 2
E        +  where 12 = <built-in method count of str object at 0x555a7971ad00>('\n')
E        +    where <built-in method count of str object at 0x555a7971ad00> = '../../../../../tmp/pytest-of-tkloczko/pytest-66/test_domain_ignore_multiple_wo0/src/contents.rst:3: (The)  The Module..../tmp/pytest-of-tkloczko/pytest-66/test_domain_ignore_multiple_wo0/src/contents.rst:8: (baddddd)  Nor, here baddddd.\n'.count

tests/test_builder.py:517: AssertionError
----------------------------------------------------------------------------------- Captured stderr call ------------------------------------------------------------------------------------
fatal: not a git repository (or any parent up to mount point /home/tkloczko)
Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).
------------------------------------------------------------------------------------- Captured log call -------------------------------------------------------------------------------------
WARNING  test.filters:filters.py:249 Called: git log --quiet --no-color --pretty=format:%(trailers:key=Co-Authored-By,separator=%x0A)%x0A%an%x0A%cn
WARNING  test.filters:filters.py:250 Failed to scan contributors: Command '['git', 'log', '--quiet', '--no-color', '--pretty=format:%(trailers:key=Co-Authored-By,separator=%x0A)%x0A%an%x0A%cn']' returned non-zero exit status 128.
_____________________________________________________________________________________ test_errors_only ______________________________________________________________________________________

    def test_errors_only():
        checker = SpellingChecker(lang='en_US',
                                  suggest=False,
                                  word_list_filename=None,
                                  )
        for word, suggestions, line, offset in checker.check('This txt is wrong'):
            assert not suggestions, 'Suggesting'
>           assert word == 'txt'
E           AssertionError: assert 'This' == 'txt'
E
E             - txt
E             + This

tests/test_checker.py:19: AssertionError
___________________________________________________________________________________ test_with_suggestions ___________________________________________________________________________________

    def test_with_suggestions():
        checker = SpellingChecker(lang='en_US',
                                  suggest=True,
                                  word_list_filename=None,
                                  )
        for word, suggestions, line, offset in checker.check('This txt is wrong'):
>           assert suggestions, 'Not suggesting'
E           AssertionError: Not suggesting
E           assert []

tests/test_checker.py:30: AssertionError
____________________________________________________________________________________ test_with_wordlist _____________________________________________________________________________________

    def test_with_wordlist():
        checker = SpellingChecker(
            lang='en_US',
            suggest=False,
            word_list_filename=os.path.join(os.path.dirname(__file__),
                                            'test_wordlist.txt')
        )
        words = [w for w, s, l, o in checker.check('This txt is wrong')]
>       assert not words, 'Did not use personal word list file'
E       AssertionError: Did not use personal word list file
E       assert not ['This', 'is', 'wrong']

tests/test_checker.py:43: AssertionError
__________________________________________________________________________________ test_with_context_line ___________________________________________________________________________________

    def test_with_context_line():
        checker = SpellingChecker(lang='en_US',
                                  suggest=False,
                                  word_list_filename=None,
                                  context_line=True,
                                  )

        text = 'Line one\nThis txt is wrong\nLine two'
        for word, suggestions, line, offset in checker.check(text):
            assert not suggestions, 'Suggesting'
>           assert word == 'txt'
E           AssertionError: assert 'Line' == 'txt'
E
E             - txt
E             + Line

tests/test_checker.py:56: AssertionError
================================================================================== short test summary info ==================================================================================
SKIPPED [1] tests/test_builder.py:257: Not a git repo
SKIPPED [27] tests/test_filter.py:49: Not a git repo
FAILED tests/test_builder.py::test_ignore_literals - AssertionError: assert '../../../../../tmp/pytest-of-tkloczko/pytest-66/test_ignore_literals0/src/contents.rst:3: (Welcome)  Welcome to Spell...../../../../../tmp/pytest-of-tkloczko/py...
FAILED tests/test_builder.py::test_legacy_directive - AssertionError: assert '../../../../../tmp/pytest-of-tkloczko/pytest-66/test_legacy_directive0/src/contents.rst:3: (The)  The Module\n../../....e Module\n../../../../../tmp/pytest-of-t...
FAILED tests/test_builder.py::test_domain_directive - AssertionError: assert '../../../../../tmp/pytest-of-tkloczko/pytest-66/test_domain_directive0/src/contents.rst:3: (The)  The Module\n../../....e Module\n../../../../../tmp/pytest-of-t...
FAILED tests/test_builder.py::test_domain_role - AssertionError: assert '../../../../../tmp/pytest-of-tkloczko/pytest-66/test_domain_role0/src/contents.rst:3: (The)  The Module\n../../../../...ule)  The Module\n../../../../../tmp/pyt...
FAILED tests/test_builder.py::test_domain_role_multiple_words - AssertionError: assert '../../../../../tmp/pytest-of-tkloczko/pytest-66/test_domain_role_multiple_word0/src/contents.rst:3: (The)  The Module..../../../../tmp/pytest-of-tkloczko/pytest...
FAILED tests/test_builder.py::test_domain_ignore - AssertionError: assert '../../../../../tmp/pytest-of-tkloczko/pytest-66/test_domain_ignore0/src/contents.rst:3: (The)  The Module\n../../../....e)  The Module\n../../../../../tmp/pytes...
FAILED tests/test_builder.py::test_domain_ignore_multiple_words - AssertionError: assert 12 == 2
FAILED tests/test_checker.py::test_errors_only - AssertionError: assert 'This' == 'txt'
FAILED tests/test_checker.py::test_with_suggestions - AssertionError: Not suggesting
FAILED tests/test_checker.py::test_with_wordlist - AssertionError: Did not use personal word list file
FAILED tests/test_checker.py::test_with_context_line - AssertionError: assert 'Line' == 'txt'
========================================================================= 11 failed, 28 passed, 28 skipped in 3.79s =========================================================================

[dhellmann]

• PYTHONPATH=/home/tkloczko/rpmbuild/BUILDROOT/python-sphinxcontrib-spelling-8.0.0-2.fc36.x86_64/usr/lib64/python3.9/site-packages:/home/tkloczko/rpmbuild/BUILDROOT/python-sphinxcontrib-spelling-8.0.0-2.fc36.x86_64/usr/lib/python3.9/site-packages
• /usr/bin/pytest -ra -m 'not network'

I'm not sure what you're doing there with the python path. It's possible you don't have enough entries for the interpreter to find everything. If you look at what the isolated target in tox.ini does, you will see that it copies the test files out of the tests directory into a temporary directory and then runs pytest there, rather than from the root of the source tree.

[kloczek]

I'm not sure what you're doing there with the python path. It's possible you don't have enough entries for the interpreter to find everything.

That is only entry added on top of default content of the sys.path.
Executing test suite in in tox does not make to much sense in my case as package build is executed inside dedicated build env created only to build that package and in which are installed only build dependencies.

-m 'not network' is standard part of my %pytest rpm macro (many python modules already standardised around that pytest mark to disable execution of the units which needs access to more than localhost). In this case it is not relevant,

If you look at what the isolated target in tox.ini does, you will see that it copies the test files out of the tests directory into a temporary directory and then runs pytest there, rather than from the root of the source tree.

None of the test suites should rely on such special procedures like copy something to special directory.
Try to think that some build infras are building sometimes packages out of R/O directory structure.
Please read about some examples of directories layouts provided in pytest documentation
https://docs.pytest.org/en/7.1.x/explanation/goodpractices.html

Did you try to reproduce this issue? 🤔