def detect_version_str(self):
        """
        Try to detect version of package from command help text. Bit of a long
        shot as they are typically included
        """
        help_text = run_matlab_cmd("help('{}')".format(self.test_func))
        if not help_text:
            raise ArcanaRequirementNotFoundError(
                "Did not find test function '{}' for {}"
                .format(self.test_func, self))
        return self.parse_help_text(help_text)