def status(self, code=None):
        """Check status code in response returned by application.
        If ``code`` is not None, assert that ``code`` is returned by application,
        else simply return the status code.

        :param code: ``code`` to assert that application returns
        :type code: int

        Example usage::

            check50.flask.app("application.py").status(200)

            status = check50.flask.app("application.py").get("/").status()
            if status != 200:
                raise check50.Failure(f"expected status code 200, but got {status}")

        """
        if code is None:
            return self.response.status_code

        log(_("checking that status code {} is returned...").format(code))
        if code != self.response.status_code:
            raise Failure(_("expected status code {}, but got {}").format(
                code, self.response.status_code))
        return self
Check status code in response returned by application.
        If ``code`` is not None, assert that ``code`` is returned by application,
        else simply return the status code.

        :param code: ``code`` to assert that application returns
        :type code: int

        Example usage::

            check50.flask.app("application.py").status(200)

            status = check50.flask.app("application.py").get("/").status()
            if status != 200:
                raise check50.Failure(f"expected status code 200, but got {status}")