[PATCH 1/5] rebase -r: demonstrate bug with conflicting merges

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

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

When calling `merge` on a branch that has already been merged, that
`merge` is skipped quietly, but currently a MERGE_HEAD file is being
left behind and will then be grabbed by the next `pick` (that did
not want to create a *merge* commit).

Demonstrate this.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 t/t3430-rebase-merges.sh | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/t/t3430-rebase-merges.sh b/t/t3430-rebase-merges.sh
index aa7bfc88ec..1f08a33687 100755
--- a/t/t3430-rebase-merges.sh
+++ b/t/t3430-rebase-merges.sh
@@ -396,4 +396,20 @@ test_expect_success 'with --autosquash and --exec' '
 	grep "G: +G" actual
 '
 
+test_expect_failure '--continue after resolving conflicts after a merge' '
+	git checkout -b already-has-g E &&
+	git cherry-pick E..G &&
+	test_commit H2 &&
+
+	git checkout -b conflicts-in-merge H &&
+	test_commit H2 H2.t conflicts H2-conflict &&
+	test_must_fail git rebase -r already-has-g &&
+	grep conflicts H2.t &&
+	echo resolved >H2.t &&
+	git add -u &&
+	git rebase --continue &&
+	test_must_fail git rev-parse --verify HEAD^2 &&
+	test_path_is_missing .git/MERGE_HEAD
+'
+
 test_done
-- 
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