AttributeError: '_FakeAccessor' object has no attribute 'owner'

[saxocellphone]

Describe the bug
Getting E AttributeError: '_FakeAccessor' object has no attribute 'owner' when running with pytest. More specifically, happens in this function in pathlib.py

# pathlib.py:1228 gives error
def owner(self):
    """
    Return the login name of the file owner.
    """
    return self._accessor.owner(self)

How To Reproduce
Run a pytest with code containing this line

owner = Path(file_path).owner()

I have tried running on python 3.9.6, python 3.6.14. It works with the ladder, but not the former.

macOS-10.16-x86_64-i386-64bit
Python 3.9.6 (v3.9.6:db3ff76da1, Jun 28 2021, 11:49:53)
[Clang 6.0 (clang-600.0.57)]
pyfakefs-4.5.0

EDIT:
Dug a bit deeper, seems like somewhere in time Pathlib changed the implementation of the owner function. This is the old implementation:

def owner(self):
    """
    Return the login name of the file owner.
    """
    import pwd
    return pwd.getpwuid(self.stat().st_uid).pw_name

The new implementation have the owner attribute in the accessor, so a mock is needed for that

[mrbean-bremen]

Thanks for the report and the investigation! As we heavily rely on the pathlib implementation itself, this is something that happens from time to time with new Python versions. We are obviously missing some test here, as the CI tests actually run with Python 3.9.6 (among others) and pass.

[mrbean-bremen]

Both owner and group are moved to accessors - both have to be mocked. The actual implementation has not changed, so we can probably just use that in the fake accessor.

[mrbean-bremen]

@saxocellphone - shall be fixed in master now, please check!