How to use the cutadapt.modifiers.Shortener function in cutadapt

def test_shortener():
    read = Sequence('read1', 'ACGTTTACGTA', '##456789###')

    shortener = Shortener(0)
    assert shortener(read, ModificationInfo(read)) == Sequence('read1', '', '')

    shortener = Shortener(1)
    assert shortener(read, ModificationInfo(read)) == Sequence('read1', 'A', '#')

    shortener = Shortener(5)
    assert shortener(read, ModificationInfo(read)) == Sequence('read1', 'ACGTT', '##456')

    shortener = Shortener(100)
    assert shortener(read, ModificationInfo(read)) == read

def test_shortener():
    read = Sequence('read1', 'ACGTTTACGTA', '##456789###')

    shortener = Shortener(0)
    assert shortener(read, ModificationInfo(read)) == Sequence('read1', '', '')

    shortener = Shortener(1)
    assert shortener(read, ModificationInfo(read)) == Sequence('read1', 'A', '#')

    shortener = Shortener(5)
    assert shortener(read, ModificationInfo(read)) == Sequence('read1', 'ACGTT', '##456')

    shortener = Shortener(100)
    assert shortener(read, ModificationInfo(read)) == read

def test_shortener():
    read = Sequence('read1', 'ACGTTTACGTA', '##456789###')

    shortener = Shortener(0)
    assert shortener(read, ModificationInfo(read)) == Sequence('read1', '', '')

    shortener = Shortener(1)
    assert shortener(read, ModificationInfo(read)) == Sequence('read1', 'A', '#')

    shortener = Shortener(5)
    assert shortener(read, ModificationInfo(read)) == Sequence('read1', 'ACGTT', '##456')

    shortener = Shortener(100)
    assert shortener(read, ModificationInfo(read)) == read

def test_shortener():
    read = Sequence('read1', 'ACGTTTACGTA', '##456789###')

    shortener = Shortener(0)
    assert shortener(read, ModificationInfo(read)) == Sequence('read1', '', '')

    shortener = Shortener(1)
    assert shortener(read, ModificationInfo(read)) == Sequence('read1', 'A', '#')

    shortener = Shortener(5)
    assert shortener(read, ModificationInfo(read)) == Sequence('read1', 'ACGTT', '##456')

    shortener = Shortener(100)
    assert shortener(read, ModificationInfo(read)) == read

def modifiers_applying_to_both_ends_if_paired(args) -> Iterator[SingleEndModifier]:
    if args.length is not None:
        yield Shortener(args.length)
    if args.trim_n:
        yield NEndTrimmer()
    if args.length_tag:
        yield LengthTagModifier(args.length_tag)
    for suffix in args.strip_suffix:
        yield SuffixRemover(suffix)
    if args.prefix or args.suffix:
        yield PrefixSuffixAdder(args.prefix, args.suffix)
    if args.zero_cap:
        yield ZeroCapper(quality_base=args.quality_base)