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

def test_arabic():
    backend = EspeakBackend('ar')
    text = u'السلام عليكم'
    sep = separator.Separator()

    # Arabic seems to have changed starting at espeak-ng-1.49.3
    if tuple(EspeakBackend.version().split('.')) >= ('1', '49', '3'):
        expected = [u'ʔassalaːm ʕliːkm ']
    else:
        expected = [u'ʔassalaam ʕaliijkum ']
    out = backend._phonemize_aux(text, sep, False)
    assert out == expected

def version():
    """Return version information for front and backends"""
    # version of the phonemizer
    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)