commit: drop duplicated parents

diff --git a/t/t7502-commit.sh b/t/t7502-commit.sh
index 46ec1ce8aaa0305f6b4569664de041137db137d7..22a13f7aababf43fac0a02b6e9310f74cc6b4f9f 100755 (executable)
--- a/t/t7502-commit.sh
+++ b/t/t7502-commit.sh
@@ -226,4 +226,18 @@ test_expect_success 'a SIGTERM should break locks' '
        ! test -f .git/index.lock
 '
 
+rm -f .git/MERGE_MSG .git/COMMIT_EDITMSG
+git reset -q --hard
+
+test_expect_success 'Hand committing of a redundant merge removes dups' '
+
+       git rev-parse second master >expect &&
+       test_must_fail git merge second master &&
+       git checkout master g &&
+       EDITOR=: git commit -a &&
+       git cat-file commit HEAD | sed -n -e "s/^parent //p" -e "/^$/q" >actual &&
+       test_cmp expect actual
+
+'
+
 test_done