How to use the phonemizer.backend.FestivalBackend.version function in phonemizer

    '2.1' in FestivalBackend.version(),
    reason='festival-2.1 gives different results than further versions '
    'for syllable boundaries')
def test_hello():
    assert _test('hello world') == ['hh-ax|l-ow w-er-l-d']
    assert _test('hello\nworld') == ['hh-ax|l-ow', 'w-er-l-d']
    assert _test('hello\nworld\n') == ['hh-ax|l-ow', 'w-er-l-d']

    '2.1' in backend.FestivalBackend.version(),
    reason='festival-2.1 gives different results than further versions '
    'for syllable boundaries')
def test_readme_festival_syll():
    _test(u'hello world',
          u'hh ax ;esyll l ow ;esyll ;eword w er l d ;esyll ;eword ',
          u"-p ' ' -s ';esyll ' -w ';eword ' -b festival -l en-us")

version = (
        'phonemizer-' + pkg_resources.get_distribution('phonemizer').version)

    # for each backend, check if it is available or not. If so get its version
    available = []
    unavailable = []

    if EspeakBackend.is_available():
        available.append(
            'espeak-' + ('ng-' if EspeakBackend.is_espeak_ng() else '')
            + EspeakBackend.version())
    else:  # pragma: nocover
        unavailable.append('espeak')

    if FestivalBackend.is_available():
        available.append('festival-' + FestivalBackend.version())
    else:  # pragma: nocover
        unavailable.append('festival')

    if SegmentsBackend.is_available():
        available.append('segments-' + SegmentsBackend.version())
    else:  # pragma: nocover
        unavailable.append('segments')

    # resumes the backends status in the final version string
    if available:
        version += '\navailable backends: ' + ', '.join(available)
    if unavailable:  # pragma: nocover
        version += '\nuninstalled backends: ' + ', '.join(unavailable)

    return version