Re: [PATCH v2 3/5] tests: turn GPG, GPGSM and RFC1991 into lazy prereqs

> Subject: [PATCH] t/README: suggest how to leave test early with failure
> +       test_expect_success 'git frotz on various versions' '
> +           for revision in one two three
> +           do
> +                   echo "frotz $revision" >expect &&
> +                   git frotz "$revision" >actual &&
> +                   test_cmp expect actual || return 1
> +           done &&
> +           test something else
> +       '
> +
> +    Note that this is only possible in our test suite, where we
> +    arrange to run your test <script> wrapped inside a helper
> +    function to ensure that return values matter; in your own script
> +    outside any function, this technique may not work.
> +
>  And here are the "don'ts:"
>
>   - Don't exit() within a <script> part.