[PATCH v2 1/4] t3701: redefine what is "bogus" output of a diff filter

["Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>]

From: Johannes Schindelin <johannes.schindelin@gmx.de>

When parsing the colored version of a diff, the interactive `add`
command really relies on the colored version having the same number of
lines as the non-colored version. That is an invariant.

However, in the 'detect bogus diffFilter output' test case in t3701, we
essentially required a hunk header that contains parseable `@@ ... @@`
hunk headers, and called all colored diffs without such hunks bogus.

The reason for this is that we would like to show the users the adjusted
hunk headers _including_ the extra part after the `@@ ... @@`
information, which usually contains things like the function name or
soms such.

Now, there is a _very_ popular diff colorizer called `diff-so-fancy`
that does not produce such colored diffs as the built-in `add` command
expects. Nevertheless, the Perl variant of the `add` command handles
those nicely, essentially by ignoring the hunk header and saying "there
is nothing else we can show except the original hunk header, even if we
had to adjust the line range and the original hunk header might get that
wrong".

In preparation for teaching the built-in interactive `add` to be a bit
more lenient, let's change the 'detect bogus diffFilter output' test
case so that it verifies that a mismatched number of lines causes the
command to error out, but not an unparseable hunk header.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 t/t3701-add-interactive.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
index b354fb39de8..b40d1c94d99 100755
--- a/t/t3701-add-interactive.sh
+++ b/t/t3701-add-interactive.sh
@@ -761,7 +761,7 @@ test_expect_success 'detect bogus diffFilter output' '
 	git reset --hard &&
 
 	echo content >test &&
-	test_config interactive.diffFilter "sed 1d" &&
+	test_config interactive.diffFilter "sed q" &&
 	printf y >y &&
 	force_color test_must_fail git add -p <y
 '
-- 
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