def test_invalid_exits_fail(self):
        sys_exit_exc = None
        # silence writes that get to stderr
        with mock.patch('cloudinit.shell.sys.stderr') as stderr:
            try:
                shell.main(args=['cloud-init', 'bogus_argument'])
            except SystemExit as sys_exit_exc:
                pass
        self.assertTrue(sys_exit_exc)
        self.assertNotEqual(sys_exit_exc.code, 0)