test_pathobject fails with IsADirectoryError fsspec 0.8.3

[tricktron]

When running all tests on our linux remote server the test test_pathobject fails with:

def test_pathobject():
        import pathlib
    
        here = os.path.abspath(os.path.dirname(__file__))
        flist = os.listdir(here)
        plist_str = [os.path.join(here, p) for p in flist]
        plist = [pathlib.Path(p) for p in plist_str]
        of = open_files(plist)
        assert len(of) == len(flist)
        assert [f.path for f in of] == plist_str
    
        of = open_files(plist[0])
        assert len(of) == 1
        assert of[0].path == plist_str[0]
>       with of[0] as f:

fsspec/tests/test_core.py:99: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
fsspec/core.py:102: in __enter__
    f = self.fs.open(self.path, mode=mode)
fsspec/spec.py:892: in open
    **kwargs
fsspec/implementations/local.py:115: in _open
    return LocalFileOpener(path, mode, fs=self, **kwargs)
fsspec/implementations/local.py:197: in __init__
    self._open()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <fsspec.implementations.local.LocalFileOpener object at 0x7ffff69a9b90>

    def _open(self):
        if self.f is None or self.f.closed:
            if self.autocommit or "w" not in self.mode:
>               self.f = open(self.path, mode=self.mode)
E               IsADirectoryError: [Errno 21] Is a directory: '/build/source/fsspec/tests/__pycache__'

fsspec/implementations/local.py:202: IsADirectoryError

If I run it locally on a OSX and linux popOS machine and on a remote OSX builder all tests pass. So I cannot reproduce it locally. This is strange as usually the linux builder passes all tests and the OSX fails😃.

Do you know what may cause this test to fail?

[martindurant]

Clearly should not rely on the state of the local directory... but should use a temp directory like all the other tests!