test_expect_success 'fail to merge into various non-notes refs' '
test_must_fail git -c "core.notesRef=refs/notes" notes merge x &&
test_must_fail git -c "core.notesRef=refs/notes/" notes merge x &&
- mkdir -p .git/refs/notes/dir &&
+ git update-ref refs/notes/dir/foo HEAD &&
test_must_fail git -c "core.notesRef=refs/notes/dir" notes merge x &&
test_must_fail git -c "core.notesRef=refs/notes/dir/" notes merge x &&
test_must_fail git -c "core.notesRef=refs/heads/master" notes merge x &&