def get_dir_from_zipfile(zip_file, fallback=None):
    """Return the name of the root folder in a zip file.

    :param zip_file: a :class:`zipfile.ZipFile` instance.
    :param fallback: if `None`, the name of the zip file is used. This is
        returned if the zip file contains more than one top-level directory,
        or none at all.
    """
    fallback = fallback or zip_file.filename
    directories = [name for name in zip_file.namelist() if name.endswith("/")
                   and len(PurePath(name).parts) == 1]
    return fallback if len(directories) > 1 else directories[0]
def test_parse_section_body():
    output_section = {
        'action_template': '    task',
        'sources_repls': 'source',
        'variable': '6',
        'target_pattern': 'target',
    }
    assert mariofile.parse_section_body(SECTION.splitlines(True)) == output_section
    with pytest.raises(mariofile.ConfigurationFileError):
        mariofile.parse_section_body(SECTION_MULTIPLE_RULE.splitlines(True))
    with pytest.raises(mariofile.ConfigurationFileError):
        mariofile.parse_section_body(INVALID_CONFIG.splitlines(True))