INTERNALERROR /path/to/file is not in the subpath of '\\/path/to/file'

[jamesbraza]

Describe the bug

In unit testing, I need to emulate a Windows OS. My base machine is macOS.

When using pyfakefs.fake_filesystem.OSType.WINDOWS + tempfile + --log-cli-level=DEBUG, I get the below internal error.

How To Reproduce

import tempfile

import pyfakefs.fake_filesystem


def test_foo(fs) -> None:
    fs.os = pyfakefs.fake_filesystem.OSType.WINDOWS

    with tempfile.TemporaryDirectory():
        pass

Outputs the following:

> pytest test/repo/test/test_play.py -s --log-cli-level=DEBUG
=============================================================================================================== test session starts ===============================================================================================================
platform darwin -- Python 3.10.9, pytest-7.2.2, pluggy-1.0.0
rootdir: /Users/user/code/repo/test, configfile: pyproject.toml
plugins: pyfakefs-5.2.2, mock-3.10.0, subtests-0.10.0
collected 1 item

test/repo/test/test_play.py::test_foo
INTERNALERROR> Traceback (most recent call last):
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/main.py", line 270, in wrap_session
INTERNALERROR>     session.exitstatus = doit(config, session) or 0
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/main.py", line 324, in _main
INTERNALERROR>     config.hook.pytest_runtestloop(session=session)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_hooks.py", line 265, in __call__
INTERNALERROR>     return self._hookexec(self.name, self.get_hookimpls(), kwargs, firstresult)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_manager.py", line 80, in _hookexec
INTERNALERROR>     return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 60, in _multicall
INTERNALERROR>     return outcome.get_result()
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_result.py", line 60, in get_result
INTERNALERROR>     raise ex[1].with_traceback(ex[2])
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 39, in _multicall
INTERNALERROR>     res = hook_impl.function(*args)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/main.py", line 349, in pytest_runtestloop
INTERNALERROR>     item.config.hook.pytest_runtest_protocol(item=item, nextitem=nextitem)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_hooks.py", line 265, in __call__
INTERNALERROR>     return self._hookexec(self.name, self.get_hookimpls(), kwargs, firstresult)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_manager.py", line 80, in _hookexec
INTERNALERROR>     return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 60, in _multicall
INTERNALERROR>     return outcome.get_result()
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_result.py", line 60, in get_result
INTERNALERROR>     raise ex[1].with_traceback(ex[2])
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 39, in _multicall
INTERNALERROR>     res = hook_impl.function(*args)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/runner.py", line 112, in pytest_runtest_protocol
INTERNALERROR>     runtestprotocol(item, nextitem=nextitem)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/runner.py", line 131, in runtestprotocol
INTERNALERROR>     reports.append(call_and_report(item, "call", log))
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/runner.py", line 224, in call_and_report
INTERNALERROR>     hook.pytest_runtest_logreport(report=report)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_hooks.py", line 265, in __call__
INTERNALERROR>     return self._hookexec(self.name, self.get_hookimpls(), kwargs, firstresult)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_manager.py", line 80, in _hookexec
INTERNALERROR>     return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 60, in _multicall
INTERNALERROR>     return outcome.get_result()
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_result.py", line 60, in get_result
INTERNALERROR>     raise ex[1].with_traceback(ex[2])
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 39, in _multicall
INTERNALERROR>     res = hook_impl.function(*args)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/terminal.py", line 551, in pytest_runtest_logreport
INTERNALERROR>     line = self._locationline(rep.nodeid, *rep.location)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/terminal.py", line 878, in _locationline
INTERNALERROR>     res = mkrel(nodeid)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/terminal.py", line 868, in mkrel
INTERNALERROR>     line = self.config.cwd_relative_nodeid(nodeid)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/config/__init__.py", line 1104, in cwd_relative_nodeid
INTERNALERROR>     nodeid = bestrelpath(self.invocation_params.dir, fullpath)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/pathlib.py", line 710, in bestrelpath
INTERNALERROR>     reldirectory = directory.relative_to(base)
INTERNALERROR>   File "/Users/user/.pyenv/versions/3.10.9/lib/python3.10/pathlib.py", line 818, in relative_to
INTERNALERROR>     raise ValueError("{!r} is not in the subpath of {!r}"
INTERNALERROR> ValueError: '/Users/user/code/repo' is not in the subpath of '\\/Users/user/code/repo' OR one path is relative and the other is absolute.
Traceback (most recent call last):
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_filesystem.py", line 1618, in get_object_from_normpath
    target = target.get_entry(component)  # type: ignore
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_file.py", line 542, in get_entry
    return self.entries[to_string(pathname_name)]
KeyError: 'Users'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/user/code/repo/venv/bin/pytest", line 8, in <module>
    sys.exit(console_main())
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/config/__init__.py", line 190, in console_main
    code = main()
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/config/__init__.py", line 167, in main
    ret: Union[ExitCode, int] = config.hook.pytest_cmdline_main(
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_hooks.py", line 265, in __call__
    return self._hookexec(self.name, self.get_hookimpls(), kwargs, firstresult)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_manager.py", line 80, in _hookexec
    return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 60, in _multicall
    return outcome.get_result()
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_result.py", line 60, in get_result
    raise ex[1].with_traceback(ex[2])
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 39, in _multicall
    res = hook_impl.function(*args)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/main.py", line 317, in pytest_cmdline_main
    return wrap_session(config, _main)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/main.py", line 302, in wrap_session
    os.chdir(session.startpath)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_os.py", line 1354, in wrapped
    return f(*args, **kwargs)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_os.py", line 421, in chdir
    self.filesystem.confirmdir(path)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_filesystem.py", line 2810, in confirmdir
    self.resolve(target_directory, check_owner=check_owner),
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_filesystem.py", line 1692, in resolve
    return self.get_object_from_normpath(
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_filesystem.py", line 1627, in get_object_from_normpath
    self.raise_os_error(errno.ENOENT, path)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_filesystem.py", line 418, in raise_os_error
    raise OSError(err_no, message, filename)
FileNotFoundError: [Errno 2] No such file or directory in the fake filesystem: 'C:\\Users\\user\\code\\repo'

Your environment

I have pyfakefs==5.2.2. Note the current version printing from the issue template is broken.

> python -c "import platform; print(platform.platform())"
macOS-12.6-arm64-arm-64bit
> python -c "import sys; print('Python', sys.version)"
Python 3.10.9 (main, Jan  6 2023, 11:19:20) [Clang 14.0.0 (clang-1400.0.29.102)]
> python -c "from pyfakefs.fake_filesystem import __version__; print('pyfakefs', __version__)"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ImportError: cannot import name '__version__' from 'pyfakefs.fake_filesystem' (/Users/user/proj/proj_venv/lib/python3.10/site-packages/pyfakefs/fake_filesystem.py)
> python -c "import pytest; print('pytest', pytest.__version__)"
pytest 7.2.2

[mrbean-bremen]

Thanks for the report!
The cross-os functionality of pyfakefs is not perfect, and mostly only used in our own tests, so there are certainly issues.
In this case it has probably to do with the different location of temp directories, though I have to have a closer look later.

As for the broken issue template - I actually noticed this in the last bug report, but forgot to check it out. Thanks for the reminder!

[jamesbraza]

Yeah thank you! Sounds good.

I also came up with a simpler repro today, simply setting the fs.os to Windows:

import pyfakefs.fake_filesystem


def test_foo(fs) -> None:
    fs.os = pyfakefs.fake_filesystem.OSType.WINDOWS

Running like this yields the error:

> pytest test/repo/test/test_play.py -s --log-cli-level=DEBUG
=============================================================================================================== test session starts ===============================================================================================================
platform darwin -- Python 3.10.9, pytest-7.2.2, pluggy-1.0.0
rootdir: /Users/user/code/repo/test, configfile: pyproject.toml
plugins: pyfakefs-5.2.2, mock-3.10.0, subtests-0.10.0
collected 1 item

test/repo/test/test_play.py::test_foo
INTERNALERROR> Traceback (most recent call last):
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/main.py", line 270, in wrap_session
INTERNALERROR>     session.exitstatus = doit(config, session) or 0
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/main.py", line 324, in _main
INTERNALERROR>     config.hook.pytest_runtestloop(session=session)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_hooks.py", line 265, in __call__
INTERNALERROR>     return self._hookexec(self.name, self.get_hookimpls(), kwargs, firstresult)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_manager.py", line 80, in _hookexec
INTERNALERROR>     return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 60, in _multicall
INTERNALERROR>     return outcome.get_result()
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_result.py", line 60, in get_result
INTERNALERROR>     raise ex[1].with_traceback(ex[2])
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 39, in _multicall
INTERNALERROR>     res = hook_impl.function(*args)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/main.py", line 349, in pytest_runtestloop
INTERNALERROR>     item.config.hook.pytest_runtest_protocol(item=item, nextitem=nextitem)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_hooks.py", line 265, in __call__
INTERNALERROR>     return self._hookexec(self.name, self.get_hookimpls(), kwargs, firstresult)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_manager.py", line 80, in _hookexec
INTERNALERROR>     return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 60, in _multicall
INTERNALERROR>     return outcome.get_result()
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_result.py", line 60, in get_result
INTERNALERROR>     raise ex[1].with_traceback(ex[2])
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 39, in _multicall
INTERNALERROR>     res = hook_impl.function(*args)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/runner.py", line 112, in pytest_runtest_protocol
INTERNALERROR>     runtestprotocol(item, nextitem=nextitem)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/runner.py", line 131, in runtestprotocol
INTERNALERROR>     reports.append(call_and_report(item, "call", log))
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/runner.py", line 224, in call_and_report
INTERNALERROR>     hook.pytest_runtest_logreport(report=report)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_hooks.py", line 265, in __call__
INTERNALERROR>     return self._hookexec(self.name, self.get_hookimpls(), kwargs, firstresult)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_manager.py", line 80, in _hookexec
INTERNALERROR>     return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 60, in _multicall
INTERNALERROR>     return outcome.get_result()
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_result.py", line 60, in get_result
INTERNALERROR>     raise ex[1].with_traceback(ex[2])
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 39, in _multicall
INTERNALERROR>     res = hook_impl.function(*args)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/terminal.py", line 551, in pytest_runtest_logreport
INTERNALERROR>     line = self._locationline(rep.nodeid, *rep.location)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/terminal.py", line 878, in _locationline
INTERNALERROR>     res = mkrel(nodeid)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/terminal.py", line 868, in mkrel
INTERNALERROR>     line = self.config.cwd_relative_nodeid(nodeid)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/config/__init__.py", line 1104, in cwd_relative_nodeid
INTERNALERROR>     nodeid = bestrelpath(self.invocation_params.dir, fullpath)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/pathlib.py", line 710, in bestrelpath
INTERNALERROR>     reldirectory = directory.relative_to(base)
INTERNALERROR>   File "/Users/user/.pyenv/versions/3.10.9/lib/python3.10/pathlib.py", line 818, in relative_to
INTERNALERROR>     raise ValueError("{!r} is not in the subpath of {!r}"
INTERNALERROR> ValueError: '/Users/user/code/repo' is not in the subpath of '\\/Users/user/code/repo' OR one path is relative and the other is absolute.
Traceback (most recent call last):
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_filesystem.py", line 1618, in get_object_from_normpath
    target = target.get_entry(component)  # type: ignore
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_file.py", line 542, in get_entry
    return self.entries[to_string(pathname_name)]
KeyError: 'Users'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/user/code/repo/venv/bin/pytest", line 8, in <module>
    sys.exit(console_main())
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/config/__init__.py", line 190, in console_main
    code = main()
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/config/__init__.py", line 167, in main
    ret: Union[ExitCode, int] = config.hook.pytest_cmdline_main(
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_hooks.py", line 265, in __call__
    return self._hookexec(self.name, self.get_hookimpls(), kwargs, firstresult)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_manager.py", line 80, in _hookexec
    return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 60, in _multicall
    return outcome.get_result()
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_result.py", line 60, in get_result
    raise ex[1].with_traceback(ex[2])
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 39, in _multicall
    res = hook_impl.function(*args)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/main.py", line 317, in pytest_cmdline_main
    return wrap_session(config, _main)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/main.py", line 302, in wrap_session
    os.chdir(session.startpath)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_os.py", line 1354, in wrapped
    return f(*args, **kwargs)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_os.py", line 421, in chdir
    self.filesystem.confirmdir(path)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_filesystem.py", line 2810, in confirmdir
    self.resolve(target_directory, check_owner=check_owner),
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_filesystem.py", line 1692, in resolve
    return self.get_object_from_normpath(
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_filesystem.py", line 1627, in get_object_from_normpath
    self.raise_os_error(errno.ENOENT, path)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_filesystem.py", line 418, in raise_os_error
    raise OSError(err_no, message, filename)
FileNotFoundError: [Errno 2] No such file or directory in the fake filesystem: 'C:\\Users\\user\\code\\repo'

[mrbean-bremen]

Ok, I think I know what the problem is - I think this is actually a regression.
On resetting the file system on changing the OS the temp is not recreated, which seem to cause the problem. I will see if I can think ths in the next days.

[davidlbaird]

If this is a regression, what was the previous code that was creating a temporary directory and adding a symlink to the fake filesystem, as is suggested for the pull request?

[mrbean-bremen]

The code to create the temp directory previously was in the patcher. The regression happened because I added a filesystem reset in the os setters, and this removed the temp directory.

[jamesbraza]

I am just giving this a whirl right now! I don't know that #818 actually fixed the issue though. I am still getting the same Exception. I first cloned the current main branch (right after #818).

> pip install ~/code/pyfakefs
Looking in indexes: https://pypi.org/simple
Processing /Users/user/code/pyfakefs
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Installing backend dependencies ... done
  Preparing metadata (pyproject.toml) ... done
Building wheels for collected packages: pyfakefs
  Building wheel for pyfakefs (pyproject.toml) ... done
  Created wheel for pyfakefs: filename=pyfakefs-5.3.dev0-py3-none-any.whl size=205504 sha256=blah
  Stored in directory: /private/var/folders/78/blah/T/pip-ephem-wheel-cache-or80khnp/wheels/17/ef/87/blah
Successfully built pyfakefs
Installing collected packages: pyfakefs
Successfully installed pyfakefs-5.3.dev0

With this file:

import pyfakefs.fake_filesystem


def test_foo(fs) -> None:
    fs.os = pyfakefs.fake_filesystem.OSType.WINDOWS

Running like so:

> pytest test/repo/test/test_play.py -s --log-cli-level=DEBUG
=============================================================================================================== test session starts ===============================================================================================================
platform darwin -- Python 3.10.9, pytest-7.3.1, pluggy-1.0.0
rootdir: /Users/user/code/repo/test
configfile: pyproject.toml
plugins: pyfakefs-5.3.dev0, mock-3.10.0, subtests-0.10.0
collected 1 item

test/repo/test/test_play.py::test_foo
INTERNALERROR> Traceback (most recent call last):
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/main.py", line 269, in wrap_session
INTERNALERROR>     session.exitstatus = doit(config, session) or 0
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/main.py", line 323, in _main
INTERNALERROR>     config.hook.pytest_runtestloop(session=session)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_hooks.py", line 265, in __call__
INTERNALERROR>     return self._hookexec(self.name, self.get_hookimpls(), kwargs, firstresult)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_manager.py", line 80, in _hookexec
INTERNALERROR>     return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 60, in _multicall
INTERNALERROR>     return outcome.get_result()
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_result.py", line 60, in get_result
INTERNALERROR>     raise ex[1].with_traceback(ex[2])
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 39, in _multicall
INTERNALERROR>     res = hook_impl.function(*args)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/main.py", line 348, in pytest_runtestloop
INTERNALERROR>     item.config.hook.pytest_runtest_protocol(item=item, nextitem=nextitem)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_hooks.py", line 265, in __call__
INTERNALERROR>     return self._hookexec(self.name, self.get_hookimpls(), kwargs, firstresult)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_manager.py", line 80, in _hookexec
INTERNALERROR>     return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 60, in _multicall
INTERNALERROR>     return outcome.get_result()
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_result.py", line 60, in get_result
INTERNALERROR>     raise ex[1].with_traceback(ex[2])
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 39, in _multicall
INTERNALERROR>     res = hook_impl.function(*args)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/runner.py", line 114, in pytest_runtest_protocol
INTERNALERROR>     runtestprotocol(item, nextitem=nextitem)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/runner.py", line 133, in runtestprotocol
INTERNALERROR>     reports.append(call_and_report(item, "call", log))
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/runner.py", line 226, in call_and_report
INTERNALERROR>     hook.pytest_runtest_logreport(report=report)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_hooks.py", line 265, in __call__
INTERNALERROR>     return self._hookexec(self.name, self.get_hookimpls(), kwargs, firstresult)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_manager.py", line 80, in _hookexec
INTERNALERROR>     return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 60, in _multicall
INTERNALERROR>     return outcome.get_result()
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_result.py", line 60, in get_result
INTERNALERROR>     raise ex[1].with_traceback(ex[2])
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 39, in _multicall
INTERNALERROR>     res = hook_impl.function(*args)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/terminal.py", line 557, in pytest_runtest_logreport
INTERNALERROR>     line = self._locationline(rep.nodeid, *rep.location)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/terminal.py", line 882, in _locationline
INTERNALERROR>     res = mkrel(nodeid)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/terminal.py", line 872, in mkrel
INTERNALERROR>     line = self.config.cwd_relative_nodeid(nodeid)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/config/__init__.py", line 1110, in cwd_relative_nodeid
INTERNALERROR>     nodeid = bestrelpath(self.invocation_params.dir, fullpath)
INTERNALERROR>   File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/pathlib.py", line 741, in bestrelpath
INTERNALERROR>     reldirectory = directory.relative_to(base)
INTERNALERROR>   File "/Users/user/.pyenv/versions/3.10.9/lib/python3.10/pathlib.py", line 818, in relative_to
INTERNALERROR>     raise ValueError("{!r} is not in the subpath of {!r}"
INTERNALERROR> ValueError: '/Users/user/code/repo' is not in the subpath of '\\/Users/user/code/repo' OR one path is relative and the other is absolute.
Traceback (most recent call last):
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_filesystem.py", line 1628, in get_object_from_normpath
    target = target.get_entry(component)  # type: ignore
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_file.py", line 542, in get_entry
    return self.entries[to_string(pathname_name)]
KeyError: 'Users'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/user/code/repo/venv/bin/pytest", line 8, in <module>
    sys.exit(console_main())
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/config/__init__.py", line 189, in console_main
    code = main()
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/config/__init__.py", line 166, in main
    ret: Union[ExitCode, int] = config.hook.pytest_cmdline_main(
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_hooks.py", line 265, in __call__
    return self._hookexec(self.name, self.get_hookimpls(), kwargs, firstresult)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_manager.py", line 80, in _hookexec
    return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 60, in _multicall
    return outcome.get_result()
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_result.py", line 60, in get_result
    raise ex[1].with_traceback(ex[2])
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pluggy/_callers.py", line 39, in _multicall
    res = hook_impl.function(*args)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/main.py", line 316, in pytest_cmdline_main
    return wrap_session(config, _main)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/_pytest/main.py", line 301, in wrap_session
    os.chdir(session.startpath)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_os.py", line 1354, in wrapped
    return f(*args, **kwargs)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_os.py", line 421, in chdir
    self.filesystem.confirmdir(path)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_filesystem.py", line 2820, in confirmdir
    self.resolve(target_directory, check_owner=check_owner),
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_filesystem.py", line 1702, in resolve
    return self.get_object_from_normpath(
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_filesystem.py", line 1637, in get_object_from_normpath
    self.raise_os_error(errno.ENOENT, path)
  File "/Users/user/code/repo/venv/lib/python3.10/site-packages/pyfakefs/fake_filesystem.py", line 428, in raise_os_error
    raise OSError(err_no, message, filename)
FileNotFoundError: [Errno 2] No such file or directory in the fake filesystem: 'C:\\Users\\user\\code\\repo'

Any ideas?

[mrbean-bremen]

I just noticed that the pytest tests run only under Linux and Windows, so the added tests are not run under macOS. As I don't have a Mac, I can only rely on the CI tests. I would have thought that Posix systems behave the same in that respect, but I was obviously wrong.

I first cloned the current main branch (right after #818).

You mean after it was merged, right?
Anyway, I will have another look tonight, if I find the time, or tomorrow.