How to use the sshuttle.helpers.debug1 function in sshuttle

def test_debug1_nop(mock_stderr, mock_stdout):
    sshuttle.helpers.debug1("message")
    assert mock_stdout.mock_calls == []
    assert mock_stderr.mock_calls == []

def pfctl(args, stdin=None):
    argv = ['pfctl'] + shlex.split(args)
    debug1('>> %s\n' % ' '.join(argv))

    env = {
        'PATH': os.environ['PATH'],
        'LC_ALL': "C",
    }
    p = ssubprocess.Popen(argv, stdin=ssubprocess.PIPE,
                          stdout=ssubprocess.PIPE,
                          stderr=ssubprocess.PIPE,
                          env=env)
    o = p.communicate(stdin)
    if p.returncode:
        raise Fatal('%r returned %d' % (argv, p.returncode))

    return o

sys.stdout.write('\0\0SSHUTTLE0001')
    sys.stdout.flush()

    handlers = []
    mux = Mux(socket.fromfd(sys.stdin.fileno(),
                            socket.AF_INET, socket.SOCK_STREAM),
              socket.fromfd(sys.stdout.fileno(),
                            socket.AF_INET, socket.SOCK_STREAM))
    handlers.append(mux)

    debug1('auto-nets:' + str(auto_nets) + '\n')
    if auto_nets:
        routes = list(list_routes())
        debug1('available routes:\n')
        for r in routes:
            debug1('  %d/%s/%d\n' % r)
    else:
        routes = []

    routepkt = ''
    for r in routes:
        routepkt += '%d,%s,%d\n' % r
    mux.send(0, ssnet.CMD_ROUTES, b(routepkt))

    hw = Hostwatch()
    hw.leftover = b('')

    def hostwatch_ready(sock):
        assert(hw.pid)
        content = hw.sock.recv(4096)
        if content:
            lines = (hw.leftover + content).split(b('\n'))

def __del__(self):
        global _swcount
        _swcount -= 1
        debug1('%r: deleting (%d remain)\n' % (self, _swcount))
        if self.exc:
            debug1('%r: error was: %s\n' % (self, self.exc))

def uwrite(self, buf):
        if self.connect_to:
            return 0  # still connecting
        self.wsock.setblocking(False)
        try:
            return _nb_clean(os.write, self.wsock.fileno(), buf)
        except OSError:
            _, e = sys.exc_info()[:2]
            if e.errno == errno.EPIPE:
                debug1('%r: uwrite: got EPIPE\n' % self)
                self.nowrite()
                return 0
            else:
                # unexpected error... stream is dead
                self.seterr('uwrite: %s' % e)
                return 0

def found_host(name, ip):
    hostname = re.sub(r'\..*', '', name)
    hostname = re.sub(r'[^-\w\.]', '_', hostname)
    if (ip.startswith('127.') or ip.startswith('255.') or
            hostname == 'localhost'):
        return

    if hostname != name:
        found_host(hostname, ip)

    oldip = hostnames.get(name)
    if oldip != ip:
        hostnames[name] = ip
        debug1('Found: %s: %s\n' % (name, ip))
        sys.stdout.write('%s,%s\n' % (name, ip))
        write_host_cache()

except BaseException:
            try:
                debug1("firewall manager: "
                       "Error trying to undo IPv6 firewall.\n")
                for line in traceback.format_exc().splitlines():
                    debug1("---> %s\n" % line)
            except BaseException:
                debug2('An error occurred, ignoring it.')

        try:
            if subnets_v4 or nslist_v4:
                debug2('firewall manager: undoing IPv4 changes.\n')
                method.restore_firewall(port_v4, socket.AF_INET, udp, user)
        except BaseException:
            try:
                debug1("firewall manager: "
                       "Error trying to undo IPv4 firewall.\n")
                for line in traceback.format_exc().splitlines():
                    debug1("firewall manager: ---> %s\n" % line)
            except BaseException:
                debug2('An error occurred, ignoring it.')

        try:
            debug2('firewall manager: undoing /etc/hosts changes.\n')
            restore_etc_hosts(port_v6 or port_v4)
        except BaseException:
            try:
                debug1("firewall manager: "
                       "Error trying to undo /etc/hosts changes.\n")
                for line in traceback.format_exc().splitlines():
                    debug1("firewall manager: ---> %s\n" % line)
            except BaseException:

else:
                break
    finally:
        try:
            sdnotify.send(sdnotify.stop())
            debug1('firewall manager: undoing changes.\n')
        except BaseException:
            debug2('An error occurred, ignoring it.')

        try:
            if subnets_v6 or nslist_v6:
                debug2('firewall manager: undoing IPv6 changes.\n')
                method.restore_firewall(port_v6, socket.AF_INET6, udp, user)
        except BaseException:
            try:
                debug1("firewall manager: "
                       "Error trying to undo IPv6 firewall.\n")
                for line in traceback.format_exc().splitlines():
                    debug1("---> %s\n" % line)
            except BaseException:
                debug2('An error occurred, ignoring it.')

        try:
            if subnets_v4 or nslist_v4:
                debug2('firewall manager: undoing IPv4 changes.\n')
                method.restore_firewall(port_v4, socket.AF_INET, udp, user)
        except BaseException:
            try:
                debug1("firewall manager: "
                       "Error trying to undo IPv4 firewall.\n")
                for line in traceback.format_exc().splitlines():
                    debug1("firewall manager: ---> %s\n" % line)