[PATCH 1/3] rebase -i: demonstrate bug with fixup!/squash! commit messages

[Johannes Schindelin <johannes.schindelin@gmx.de>]

When multiple fixup/squash commands are processed and the last one
causes merge conflicts and is skipped, we leave the "This is a
combination of ..." comments in the commit message.

Noticed by Eric Sunshine.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 t/t3418-rebase-continue.sh | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/t/t3418-rebase-continue.sh b/t/t3418-rebase-continue.sh
index 9214d0bb511..b177baee322 100755
--- a/t/t3418-rebase-continue.sh
+++ b/t/t3418-rebase-continue.sh
@@ -88,6 +88,27 @@ test_expect_success 'rebase passes merge strategy options correctly' '
 	git rebase --continue
 '
 
+test_expect_failure '--continue after failed fixup cleans commit message' '
+	git checkout -b with-conflicting-fixup &&
+	test_commit wants-fixup &&
+	test_commit "fixup! wants-fixup" wants-fixup.t 1 wants-fixup-1 &&
+	test_commit "fixup! wants-fixup" wants-fixup.t 2 wants-fixup-2 &&
+	test_commit "fixup! wants-fixup" wants-fixup.t 3 wants-fixup-3 &&
+	test_must_fail env FAKE_LINES="1 fixup 2 fixup 4" \
+		git rebase -i HEAD~4 &&
+
+	: now there is a conflict, and comments in the commit message &&
+	git show HEAD >out &&
+	grep "This is a combination of" out &&
+
+	: skip and continue &&
+	git rebase --skip &&
+
+	: now the comments in the commit message should have been cleaned up &&
+	git show HEAD >out &&
+	! grep "This is a combination of" out
+'
+
 test_expect_success 'setup rerere database' '
 	rm -fr .git/rebase-* &&
 	git reset --hard commit-new-file-F3-on-topic-branch &&
-- 
2.17.0.windows.1.15.gaa56ade3205