def main(): """Perform check_stability functionality and return exit code.""" venv = Virtualenv(os.environ.get("VIRTUAL_ENV", os.path.join(wpt_root, "_venv"))) venv.install_requirements(os.path.join(wpt_root, "tools", "wptrunner", "requirements.txt")) args, wpt_args = get_parser().parse_known_args() return run(venv, wpt_args, **vars(args))