t3415: verify that an empty instructionFormat is handled as before

An upcoming patch will move the todo list generation into the
rebase--helper. An early version of that patch regressed on an empty
rebase.instructionFormat value (the shell version could not discern
between an empty one and a non-existing one, but the C version used the
empty one as if that was intended to skip the oneline from the `pick
<hash>` lines).

Let's verify that this still works as before.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t3415-rebase-autosquash.sh b/t/t3415-rebase-autosquash.sh
index 5848949ec3700c2188d581500c19eaffa1392c3d..6d99f624b620a74e5ee66fbcd736517f46eabdce 100755 (executable)
--- a/t/t3415-rebase-autosquash.sh
+++ b/t/t3415-rebase-autosquash.sh
@@ -271,6 +271,18 @@ test_expect_success C_LOCALE_OUTPUT 'autosquash with custom inst format' '
        test 2 = $(git cat-file commit HEAD^ | grep squash | wc -l)
 '
 
+test_expect_success 'autosquash with empty custom instructionFormat' '
+       git reset --hard base &&
+       test_commit empty-instructionFormat-test &&
+       (
+               set_cat_todo_editor &&
+               test_must_fail git -c rebase.instructionFormat= \
+                       rebase --autosquash  --force -i HEAD^ >actual &&
+               git log -1 --format="pick %h %s" >expect &&
+               test_cmp expect actual
+       )
+'
+
 set_backup_editor () {
        write_script backup-editor.sh <<-\EOF
        cp "$1" .git/backup-"$(basename "$1")"