How to use the sshuttle.sdnotify.ready function in sshuttle

def test_notify_socket_error(mock_get, mock_socket):
    mock_get.return_value = '/run/valid_path'
    mock_socket.side_effect = socket.error('test error')
    assert not sshuttle.sdnotify.send(sshuttle.sdnotify.ready())

def test_notify_socket_not_there(mock_get):
    mock_get.return_value = '/run/valid_nonexistent_path'
    assert not sshuttle.sdnotify.send(sshuttle.sdnotify.ready())

def test_notify_invalid_socket_path(mock_get):
    mock_get.return_value = 'invalid_path'
    assert not sshuttle.sdnotify.send(sshuttle.sdnotify.ready())

def test_notify_sendto_error(mock_get, mock_socket):
    message = sshuttle.sdnotify.ready()
    socket_path = '/run/valid_path'

    sock = Mock()
    sock.sendto.side_effect = socket.error('test error')
    mock_get.return_value = '/run/valid_path'
    mock_socket.return_value = sock

    assert not sshuttle.sdnotify.send(message)
    assert sock.sendto.mock_calls == [
        call(message, socket_path),
    ]

def test_notify(mock_get, mock_socket):
    messages = [sshuttle.sdnotify.ready(), sshuttle.sdnotify.status('Running')]
    socket_path = '/run/valid_path'

    sock = Mock()
    sock.sendto.return_value = 1
    mock_get.return_value = '/run/valid_path'
    mock_socket.return_value = sock

    assert sshuttle.sdnotify.send(*messages)
    assert sock.sendto.mock_calls == [
        call(b'\n'.join(messages), socket_path),
    ]

if subnets_v6 or nslist_v6:
            debug2('firewall manager: setting up IPv6.\n')
            method.setup_firewall(
                port_v6, dnsport_v6, nslist_v6,
                socket.AF_INET6, subnets_v6, udp,
                user)

        if subnets_v4 or nslist_v4:
            debug2('firewall manager: setting up IPv4.\n')
            method.setup_firewall(
                port_v4, dnsport_v4, nslist_v4,
                socket.AF_INET, subnets_v4, udp,
                user)

        stdout.write('STARTED\n')
        sdnotify.send(sdnotify.ready(),
                      sdnotify.status('Connected'))

        try:
            stdout.flush()
        except IOError:
            # the parent process died for some reason; he's surely been loud
            # enough, so no reason to report another error
            return

        # Now we wait until EOF or any other kind of exception.  We need
        # to stay running so that we don't need a *second* password
        # authentication at shutdown time - that cleanup is important!
        while 1:
            line = stdin.readline(128)
            if line.startswith('HOST '):
                (name, ip) = line[5:].strip().split(',', 1)