docs: def process_debug_request(self, req):
          """
          Debgging helper used for testing, processes the given request and dumps
          the internal state of cached user to group mappings. Note that this is
          only callable if TRAC_GITHUB_ENABLE_DEBUGGING is set in the
          environment.
          """
          req.send(json.dumps(self._fetch_groups()).encode('utf-8'), 'application/json', 200)