How to use the sshuttle.methods.get_method function in sshuttle

def test_get_supported_features():
    method = get_method('nat')
    features = method.get_supported_features()
    assert not features.ipv6
    assert not features.udp
    assert features.dns

def test_setup_firewall_darwin(mock_pf_get_dev, mock_ioctl, mock_pfctl):
    mock_pfctl.side_effect = pfctl

    method = get_method('pf')
    assert method.name == 'pf'

    # IPV6

    method.setup_firewall(
        1024, 1026,
        [(AF_INET6, u'2404:6800:4004:80c::33')],
        AF_INET6,
        [(AF_INET6, 64, False, u'2404:6800:4004:80c::', 8000, 9000),
            (AF_INET6, 128, True, u'2404:6800:4004:80c::101f', 8080, 8080)],
        False,
        None)
    assert mock_ioctl.mock_calls == [
        call(mock_pf_get_dev(), 0xC4704433, ANY),
        call(mock_pf_get_dev(), 0xCC20441A, ANY),
        call(mock_pf_get_dev(), 0xCC20441A, ANY),

def test_setup_firewall(mock_ipt_chain_exists, mock_ipt_ttl, mock_ipt):
    mock_ipt_chain_exists.return_value = True
    method = get_method('nat')
    assert method.name == 'nat'

    with pytest.raises(Exception) as excinfo:
        method.setup_firewall(
            1024, 1026,
            [(AF_INET6, u'2404:6800:4004:80c::33')],
            AF_INET6,
            [(AF_INET6, 64, False, u'2404:6800:4004:80c::', 0, 0),
                (AF_INET6, 128, True, u'2404:6800:4004:80c::101f', 80, 80)],
            True,
            None)
    assert str(excinfo.value) \
        == 'Address family "AF_INET6" unsupported by nat method_name'
    assert mock_ipt_chain_exists.mock_calls == []
    assert mock_ipt_ttl.mock_calls == []
    assert mock_ipt.mock_calls == []

def test_assert_features():
    method = get_method('nat')
    features = method.get_supported_features()
    method.assert_features(features)

    features.udp = True
    with pytest.raises(Fatal):
        method.assert_features(features)

    features.ipv6 = True
    with pytest.raises(Fatal):
        method.assert_features(features)

def test_assert_features():
    method = get_method('pf')
    features = method.get_supported_features()
    method.assert_features(features)

    features.udp = True
    with pytest.raises(Fatal):
        method.assert_features(features)

    features.ipv6 = True
    with pytest.raises(Fatal):
        method.assert_features(features)

def test_recv_udp():
    sock = Mock()
    sock.recvfrom.return_value = "11111", "127.0.0.1"
    method = get_method('pf')
    result = method.recv_udp(sock, 1024)
    assert sock.mock_calls == [call.recvfrom(1024)]
    assert result == ("127.0.0.1", None, "11111")

def test_get_tcp_dstip():
    sock = Mock()
    sock.getsockopt.return_value = struct.pack(
        '!HHBBBB', socket.ntohs(AF_INET), 1024, 127, 0, 0, 1)
    method = get_method('nat')
    assert method.get_tcp_dstip(sock) == ('127.0.0.1', 1024)
    assert sock.mock_calls == [call.getsockopt(0, 80, 16)]

def test_send_udp(mock_socket):
    sock = Mock()
    method = get_method('tproxy')
    method.send_udp(sock, "127.0.0.2", "127.0.0.1", "2222222")
    assert sock.mock_calls == []
    assert mock_socket.mock_calls == [
        call(sock.family, 2),
        call().setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1),
        call().setsockopt(0, 19, 1),
        call().bind('127.0.0.2'),
        call().sendto("2222222", '127.0.0.1'),
        call().close()
    ]

def test_firewall_command():
    method = get_method('tproxy')
    assert not method.firewall_command("somthing")

def main(method_name, syslog):
    stdin, stdout = setup_daemon()
    hostmap = {}

    debug1('firewall manager: Starting firewall with Python version %s\n'
           % platform.python_version())

    if method_name == "auto":
        method = get_auto_method()
    else:
        method = get_method(method_name)

    if syslog:
        ssyslog.start_syslog()
        ssyslog.stderr_to_syslog()

    debug1('firewall manager: ready method name %s.\n' % method.name)
    stdout.write('READY %s\n' % method.name)
    stdout.flush()

    # we wait until we get some input before creating the rules.  That way,
    # sshuttle can launch us as early as possible (and get sudo password
    # authentication as early in the startup process as possible).
    line = stdin.readline(128)
    if not line:
        return  # parent died; nothing to do