Re: [PATCH v2 4/8] test-lib-functions: add and use test_cmp_cmd

> Another reason I'm "meh" about this function is that it seems too
> narrowly focussed, insisting that the "expect" argument is expressed
> as a one-liner. (Yes, I know that that is not a hard limitation; a
> caller can pass in a multiline string, but still...) Maybe I'd be less
> jaded if it accepted "expect" on its stdin. But, even that doesn't
> seem to buy much. The vast majority of cases where you've converted:
>
>     test "$dir" = "$(test-tool path-utils real_path $dir2)" &&
>
> to:
>
>     test_cmp_cmd "$dir" test-tool path-utils real_path $dir2 &&
>
> could just have easily become:
>
>     echo "$dir" >expect &&
>     test-tool path-utils real_path $dir2 >actual &&
>     test_cmp expect actual
>
> which isn't bad at all, even if it is one line longer, and it is
> idiomatic in this test suite.