usability: don't ask questions if no reply is required

diff --git a/t/t3412-rebase-root.sh b/t/t3412-rebase-root.sh
index 0b521057283bf106da8ce55f25f61c7ec7e3ad35..73a39f2923aa7536ce65ea3ee514805122be79b1 100755 (executable)
--- a/t/t3412-rebase-root.sh
+++ b/t/t3412-rebase-root.sh
@@ -133,7 +133,7 @@ test_expect_success 'set up second root and merge' '
        rm A B C &&
        test_commit 6 D &&
        git checkout other &&
-       git merge third
+       git merge --allow-unrelated-histories third
 '
 
 cat > expect-third <<'EOF'