def addoption(self, *opts, **attrs):
self._anonymous.addoption(*opts, **attrs)<EOL>
register a command line option.

        :opts: option names, can be short or long options.
        :attrs: same attributes which the ``add_option()`` function of the
           `argparse library
           <http://docs.python.org/2/library/argparse.html>`_
           accepts.

        After command line parsing options are available on the pytest config
        object via ``config.option.NAME`` where ``NAME`` is usually set
        by passing a ``dest`` attribute, for example
        ``addoption("--long", dest="NAME", ...)``.