ss:`Client`) that allows to create multipart requests,
        support for cookies etc.

        This accepts the same options as the
        :class:`~werkzeug.test.EnvironBuilder`.

        .. versionchanged:: 0.5
           This method now accepts the same arguments as
           :class:`~werkzeug.test.EnvironBuilder`.  Because of this the
           `environ` parameter is now called `environ_overrides`.

        :return: request object
        r