How to use the libtmux.common.tmux_cmd function in libtmux

def test_tmux_cmd_raises_on_not_found():
    with pytest.raises(TmuxCommandNotFound):
        tmux_cmd('-V', tmux_search_paths=[], append_env_path=False)

    tmux_cmd('-V')

def get_version():
    """
    Return tmux version.

    If tmux is built from git master, the version returned will be the latest
    version appended with -master, e.g. ``2.4-master``.

    If using OpenBSD's base system tmux, the version will have ``-openbsd``
    appended to the latest version, e.g. ``2.4-openbsd``.

    Returns
    -------
    :class:`distutils.version.LooseVersion`
        tmux version according to :func:`libtmux.common.which`'s tmux
    """
    proc = tmux_cmd('-V')
    if proc.stderr:
        if proc.stderr[0] == 'tmux: unknown option -- V':
            if sys.platform.startswith("openbsd"):  # openbsd has no tmux -V
                return LooseVersion('%s-openbsd' % TMUX_MAX_VERSION)
            raise exc.LibTmuxException(
                'libtmux supports tmux %s and greater. This system'
                ' is running tmux 1.3 or earlier.' % TMUX_MIN_VERSION
            )
        raise exc.VersionTooLow(proc.stderr)

    version = proc.stdout[0].split('tmux ')[1]

    # Allow latest tmux HEAD
    if version == 'master':
        return LooseVersion('%s-master' % TMUX_MAX_VERSION)

def is_version(version):
    """Return True if tmux version installed.

    :param version: version, '1.8'
    :param type: string
    :rtype: bool

    """
    proc = tmux_cmd('-V')

    if proc.stderr:
        raise exc.LibTmuxException(proc.stderr)

    installed_version = proc.stdout[0].split('tmux ')[1]

    return StrictVersion(installed_version) == StrictVersion(version)

args = list(args)
        if self.socket_name:
            args.insert(0, '-L{0}'.format(self.socket_name))
        if self.socket_path:
            args.insert(0, '-S{0}'.format(self.socket_path))
        if self.config_file:
            args.insert(0, '-f{0}'.format(self.config_file))
        if self.colors:
            if self.colors == 256:
                args.insert(0, '-2')
            elif self.colors == 88:
                args.insert(0, '-8')
            else:
                raise ValueError('Server.colors must equal 88 or 256')

        return tmux_cmd(*args, **kwargs)