How to use the oscpy.parser.format_bundle function in oscpy

def test_format_bundle():
    bundle, stats = format_bundle((message_1[0], message_2[0]), timetag=None)

    assert struct.pack('>%iB' % len(message_1[1]), *message_1[1]) in bundle
    assert struct.pack('>%iB' % len(message_2[1]), *message_2[1]) in bundle

    timetag, messages = read_bundle(bundle)

    assert timetag == approx(time())
    assert len(messages) == 2
    assert messages[0][::2] == message_1[2]
    assert messages[1][::2] == message_2[2]

    assert stats.calls == 2
    assert stats.bytes == 72
    assert stats.params == 6
    assert stats.types['f'] == 3
    assert stats.types['i'] == 2

example:
        (
            ('/create', ['name', 'value']),
            ('/select', ['name']),
            ('/update', ['name', 'value2']),
            ('/delete', ['name']),
        )

    `timetag` is optional but can be a float of the number of seconds
    since 1970 when the events described in the bundle should happen.

    See `send_message` documentation for the other parameters.
    """
    if not sock:
        sock = SOCK
    bundle, stats = format_bundle(
        messages, timetag=timetag, encoding=encoding,
        encoding_errors=encoding_errors
    )
    sock.sendto(bundle, (ip_address, port))
    if safer:
        sleep(10e-9)

    return stats