[PATCH] t3404: check root commit in 'rebase -i --root reword root commit'

[Todd Zullinger <tmz@pobox.com>]

When testing a reworded root commit, ensure that the squash-onto commit
which is created and amended is still the root commit.

Suggested-by: Phillip Wood <phillip.wood@talktalk.net>
Helped-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Todd Zullinger <tmz@pobox.com>
---
Hi Johannes,

Johannes Schindelin wrote:
>On Mon, 18 Jun 2018, Todd Zullinger wrote:
>> Phillip Wood wrote:
>>> On 15/06/18 05:31, Johannes Schindelin via GitGitGadget wrote:
>>>>
>>>> From: Todd Zullinger <tmz@pobox.com>
>>>>
>>>> +test_expect_failure 'rebase -i --root reword root commit' '
>>>> +  test_when_finished "test_might_fail git rebase --abort" &&
>>>> +  git checkout -b reword-root-branch master &&
>>>> +  set_fake_editor &&
>>>> +  FAKE_LINES="reword 1 2" FAKE_COMMIT_MESSAGE="A changed" \
>>>> +  git rebase -i --root &&
>>>> +  git show HEAD^ | grep "A changed"
>>>
>>> I wonder if it should also check that HEAD^ is the root commit, to make
>>> sure that the squash-onto commit that's created and then amended has
>>> been squashed onto.
>>
>> Hmm, is that something which other tests don't cover or an
>> issue that could affect 'rebase -i --root' with reword
>> differently than other 'rebase -i' commands?
>>
>> I admit I'm not well-versed in the rebase -i tests and I
>> focused only on creating a test which demonstrated the bug I
>> noticed.
>
> I think we should test this here, to make sure it is tested, and it should
> be as easy as:
>
>        test -z "$(git show -s --format=%p HEAD^)"
>
> Hopefully you beat me to it, otherwise I will try to take care of this
> tomorrow.

With luck, this will save you a few minutes, assuming the
commit message is reasonable (or can be improved with help
from Phillip and others). :)

Or Junio may just squash this onto js/rebase-i-root-fix.

Thanks.

 t/t3404-rebase-interactive.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/t/t3404-rebase-interactive.sh b/t/t3404-rebase-interactive.sh
index e500d7c320..352a52e59d 100755
--- a/t/t3404-rebase-interactive.sh
+++ b/t/t3404-rebase-interactive.sh
@@ -977,7 +977,8 @@ test_expect_success 'rebase -i --root reword root commit' '
 	set_fake_editor &&
 	FAKE_LINES="reword 1 2" FAKE_COMMIT_MESSAGE="A changed" \
 	git rebase -i --root &&
-	git show HEAD^ | grep "A changed"
+	git show HEAD^ | grep "A changed" &&
+	test -z "$(git show -s --format=%p HEAD^)"
 '
 
 test_expect_success C_LOCALE_OUTPUT 'rebase --edit-todo does not work on non-interactive rebase' '
-- 
Todd
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