[issue31380] test_undecodable_filename() in Lib/test/test_httpservers.py broken on APFS

[Ronald Oussoren]

Ronald Oussoren <ronaldoussoren at mac.com> added the comment:

Another option is to skip this test unconditionally on macOS when using APFS, the test is already skipped on win32 and tests a generic codepath where only testing on Linux should be fine.

BTW. It is fairly easy to detect if a path is on APFS:

```
import subprocess
  
def is_apfs(path):
    lines = subprocess.check_output(['df', path]).decode('utf-8').splitlines()
    mountpoint = lines[1].split(None, 1)[0]

    lines = subprocess.check_output(['mount']).decode('utf-8').splitlines()
    for ln in lines:
        path = ln.split(None, 1)[0]
        if path == mountpoint:
            return '(apfs' in ln

    return False
```

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<https://bugs.python.org/issue31380>
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