How to use the wheel.util.as_bytes function in wheel

def test_testzip(wheel_path, algorithm, digest):
    hash_string = '{}={}'.format(algorithm, digest)
    with ZipFile(wheel_path, 'w') as zf:
        zf.writestr(native('hello/héllö.py'), as_bytes('print("Héllö, world!")\n'))
        zf.writestr('test-1.0.dist-info/RECORD',
                    as_bytes('hello/héllö.py,{},25'.format(hash_string)))

    with WheelFile(wheel_path) as wf:
        wf.testzip()

def test_write_str(wheel_path):
    with WheelFile(wheel_path, 'w') as wf:
        wf.writestr(native('hello/héllö.py'), as_bytes('print("Héllö, world!")\n'))
        wf.writestr(native('hello/h,ll,.py'), as_bytes('print("Héllö, world!")\n'))

    with ZipFile(wheel_path, 'r') as zf:
        infolist = zf.infolist()
        assert len(infolist) == 3
        assert infolist[0].filename == native('hello/héllö.py')
        assert infolist[0].file_size == 25
        assert infolist[1].filename == native('hello/h,ll,.py')
        assert infolist[1].file_size == 25
        assert infolist[2].filename == 'test-1.0.dist-info/RECORD'

        record = zf.read('test-1.0.dist-info/RECORD')
        assert record == as_bytes(
            'hello/héllö.py,sha256=bv-QV3RciQC2v3zL8Uvhd_arp40J5A9xmyubN34OVwo,25\n'
            '"hello/h,ll,.py",sha256=bv-QV3RciQC2v3zL8Uvhd_arp40J5A9xmyubN34OVwo,25\n'

def test_testzip(wheel_path, algorithm, digest):
    hash_string = '{}={}'.format(algorithm, digest)
    with ZipFile(wheel_path, 'w') as zf:
        zf.writestr(native('hello/héllö.py'), as_bytes('print("Héllö, world!")\n'))
        zf.writestr('test-1.0.dist-info/RECORD',
                    as_bytes('hello/héllö.py,{},25'.format(hash_string)))

    with WheelFile(wheel_path) as wf:
        wf.testzip()

def test_testzip_bad_hash(wheel_path):
    with ZipFile(wheel_path, 'w') as zf:
        zf.writestr(native('hello/héllö.py'), as_bytes('print("Héllö, w0rld!")\n'))
        zf.writestr(
            'test-1.0.dist-info/RECORD',
            as_bytes('hello/héllö.py,sha256=bv-QV3RciQC2v3zL8Uvhd_arp40J5A9xmyubN34OVwo,25'))

    with WheelFile(wheel_path) as wf:
        exc = pytest.raises(WheelError, wf.testzip)
        exc.match(native("^Hash mismatch for file 'hello/héllö.py'$"))

def test_weak_hash_algorithm(wheel_path, algorithm, digest):
    hash_string = '{}={}'.format(algorithm, digest)
    with ZipFile(wheel_path, 'w') as zf:
        zf.writestr(native('hello/héllö.py'), as_bytes('print("Héllö, w0rld!")\n'))
        zf.writestr('test-1.0.dist-info/RECORD',
                    as_bytes('hello/héllö.py,{},25'.format(hash_string)))

    exc = pytest.raises(WheelError, WheelFile, wheel_path)
    exc.match(r"^Weak hash algorithm \({}\) is not permitted by PEP 427$".format(algorithm))

def test_write_str(wheel_path):
    with WheelFile(wheel_path, 'w') as wf:
        wf.writestr(native('hello/héllö.py'), as_bytes('print("Héllö, world!")\n'))
        wf.writestr(native('hello/h,ll,.py'), as_bytes('print("Héllö, world!")\n'))

    with ZipFile(wheel_path, 'r') as zf:
        infolist = zf.infolist()
        assert len(infolist) == 3
        assert infolist[0].filename == native('hello/héllö.py')
        assert infolist[0].file_size == 25
        assert infolist[1].filename == native('hello/h,ll,.py')
        assert infolist[1].file_size == 25
        assert infolist[2].filename == 'test-1.0.dist-info/RECORD'

        record = zf.read('test-1.0.dist-info/RECORD')
        assert record == as_bytes(
            'hello/héllö.py,sha256=bv-QV3RciQC2v3zL8Uvhd_arp40J5A9xmyubN34OVwo,25\n'
            '"hello/h,ll,.py",sha256=bv-QV3RciQC2v3zL8Uvhd_arp40J5A9xmyubN34OVwo,25\n'

def test_testzip(wheel_path, algorithm, digest):
    hash_string = '{}={}'.format(algorithm, digest)
    with ZipFile(wheel_path, 'w') as zf:
        zf.writestr(native('hello/héllö.py'), as_bytes('print("Héllö, world!")\n'))
        zf.writestr('test-1.0.dist-info/RECORD',
                    as_bytes('hello/héllö.py,{},25'.format(hash_string)))

    with WheelFile(wheel_path) as wf:
        wf.testzip()

def test_testzip_missing_hash(wheel_path):
    with ZipFile(wheel_path, 'w') as zf:
        zf.writestr(native('hello/héllö.py'), as_bytes('print("Héllö, world!")\n'))
        zf.writestr('test-1.0.dist-info/RECORD', '')

    with WheelFile(wheel_path) as wf:
        exc = pytest.raises(WheelError, wf.testzip)
        exc.match(native("^No hash found for file 'hello/héllö.py'$"))

if self.fp is not None and self.mode == 'w' and self._file_hashes:
            data = StringIO()
            writer = csv.writer(data, delimiter=',', quotechar='"', lineterminator='\n')
            writer.writerows((
                (
                    fname,
                    algorithm + "=" + hash_,
                    self._file_sizes[fname]
                )
                for fname, (algorithm, hash_) in self._file_hashes.items()
            ))
            writer.writerow((format(self.record_path), "", ""))
            zinfo = ZipInfo(native(self.record_path), date_time=get_zipinfo_datetime())
            zinfo.compress_type = ZIP_DEFLATED
            zinfo.external_attr = 0o664 << 16
            self.writestr(zinfo, as_bytes(data.getvalue()))

        ZipFile.close(self)

if self.fp is not None and self.mode == 'w' and self._file_hashes:
            data = StringIO()
            writer = csv.writer(data, delimiter=',', quotechar='"', lineterminator='\n')
            writer.writerows((
                (
                    fname,
                    algorithm + "=" + hash_,
                    self._file_sizes[fname]
                )
                for fname, (algorithm, hash_) in self._file_hashes.items()
            ))
            writer.writerow((format(self.record_path), "", ""))
            zinfo = ZipInfo(native(self.record_path), date_time=get_zipinfo_datetime())
            zinfo.compress_type = self.compression
            zinfo.external_attr = 0o664 << 16
            self.writestr(zinfo, as_bytes(data.getvalue()))

        ZipFile.close(self)