[issue17689] Fix test discovery for test_tarfile.py

[Antoine Pitrou]

Antoine Pitrou added the comment:

Wouldn't it be simpler to write (untested):

def skipUnlessCompressionModule(name):
    """
    Skip if the specified compression module is not available.  Must e a
    string, currently any of 'gzip', 'bz2', or 'lzma'.
    """
    return unittest.skipUnless(globals()[name],
                               '{} not available'.format(name))

?

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nosy: +pitrou

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