Re: [GSoC][PATCH v2 5/5] t0000-basic: use test_line_count instead of wc -l

[Eric Sunshine <sunshine@sunshineco.com>]

On Sun, Mar 10, 2019 at 4:11 AM Jonathan Chang <ttjtftx@gmail.com> wrote:
> Signed-off-by: Jonathan Chang <ttjtftx@gmail.com>
>
> diff --git a/t/t0000-basic.sh b/t/t0000-basic.sh
> @@ -1136,8 +1136,8 @@ test_expect_success 'git commit-tree omits duplicated parent in a commit' '
> -       numparent=$(sed -n -e "s/^parent //p" -e "/^author /q" actual | wc -l) &&
> -       test $numparent = 1
> +       sed -n -e "s/^parent //p" -e "/^author /q" actual | wc -l >numparent &&
> +       test_line_count = 1 numparent

This transformation makes no sense. The output of 'sed' is fed to 'wc
-l' whose output is redirected to file "numparent", which means that
the output file will end up containing a single line no matter how
many "parent" lines are matched in the input. Since test_line_count()
checks the number of lines in the named file, the test will succeed
unconditionally (which makes for a pretty poor test).

Also, the filename "numparent" doesn't do a good job of representing
what the file is expected to contain. A better name might be
"parents". So, a more correct transformation would be:

    sed -n -e "s/^parent //p" -e "/^author /q" actual >parents &&
    test_line_count = 1 parents

> @@ -1146,8 +1146,8 @@ test_expect_success 'update-index D/F conflict' '
> -       numpath0=$(wc -l <actual) &&
> -       test $numpath0 = 1
> +       wc -l <actual >numpath0 &&
> +       test_line_count = 1 numpath0

Same comment about bogus transformation. The entire sequence should
collapse to a single line:

    test_line_count = 1 actual