def _check_env_vars_set(self, dir_env_var, file_env_var):
        """
        Check to see if the default cert dir/file environment vars are present.

        :return: bool
        """
        return (
            os.environ.get(file_env_var) is not None or
            os.environ.get(dir_env_var) is not None
        )
Check to see if the default cert dir/file environment vars are present.

        :return: bool