def options(self, parser, env=os.environ):
        """
        Base class override.
        Add options to the nose argument parser.
        """
        # pylint:disable=dangerous-default-value
        super(FlakyPlugin, self).options(parser, env=env)
        self.add_report_option(parser.add_option)
        group = OptionGroup(
            parser, "Force flaky", "Force all tests to be flaky.")
        self.add_force_flaky_options(group.add_option)
        parser.add_option_group(group)