Re: [PATCH] tests: use different output files to simplify reading failed .log files

[Jim Meyering]

Paolo Bonzini wrote:
> I noticed that from the .log files it is hard to understand which
> grep invocation fails.  One way to work around it would be to use
> set -x, but I think this other fix is better.
>
> * tests/case-fold-backref, tests/case-fold-char-class,
> tests/case-fold-char-range, tests/case-fold-char-type: Use a different
> name for each output file from grep.
> * tests/dfaexec-multibyte: Likewise, and merge some grep invocations.

I normally diagnose such problems via

    make -C tests TESTS='test_name1 test_name2 ...' VERBOSE=yes

The VERBOSE=yes makes each init.sh-based test "set -x".

However, if you find it worthwhile, go ahead, but please factor
out the duplication.  I find that having long names like that
(especially when repeated) is a maintenance headache.

  out=out2-$LOC
  LC_ALL=$LOC grep -E '^([[:digit:]]+[[:space:]]+){2}' < exp2 > $out || fail=1
  compare $out exp2 || fail=1


...
> +  LC_ALL=$LOC grep -E '^([[:digit:]]+[[:space:]]+){2}' < exp2 > out2-$LOC || 
> fail=1
> +  compare out2-$LOC exp2 || fail=1
>
>  done