How to use the gitlabform.gitlab.core.TestRequestFailedException function in gitlabform

def initialize_configuration_and_gitlab(self):

        try:
            gl = GitLab(self.args.config.strip())
            c = Configuration(self.args.config.strip())
            return gl, c
        except ConfigFileNotFoundException as e:
            logging.fatal('Aborting - config file not found at: %s', e)
            sys.exit(1)
        except TestRequestFailedException as e:
            logging.fatal("Aborting - GitLab test request failed, details: '%s'", e)
            sys.exit(2)

self.session = requests.Session()

        retries = Retry(total=3,
                        backoff_factor=0.25,
                        status_forcelist=[500, 502, 503, 504])

        self.session.mount('http://', HTTPAdapter(max_retries=retries))
        self.session.mount('https://', HTTPAdapter(max_retries=retries))
        self.session.verify = self.ssl_verify

        try:
            version = self._make_requests_to_api("version")
            logging.info("Connected to GitLab version: %s (%s)" % (version['version'], version['revision']))
        except Exception as e:
            raise TestRequestFailedException(e)
        try:
            api_version = configuration.get("gitlab|api_version")
            if api_version != 4:
                raise ApiVersionIncorrectException(e)
            logging.info("Config file is declared to be compatible with GitLab API v4")
        except KeyNotFoundException:
            logging.fatal("Aborting. GitLabForm 1.0.0 has switched from GitLab API v3 to v4 in which some parameter "
                          "names have changed. By its design GitLabForm reads some parameter names directly from "
                          "config.yml so you need to update those names by yourself. See changes in config.yml "
                          "in this diff to see what had to be changed there: "
                          "https://github.com/egnyte/gitlabform/pull/28/files . "
                          "After updating your config.yml please add 'api_version' key to 'gitlab' section and set it "
                          "to 4 to indicate that your config is v4-compatible.")
            sys.exit(3)