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diff --git a/t/t3320-notes-merge-worktrees.sh b/t/t3320-notes-merge-worktrees.sh
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+#!/bin/sh
+#
+# Copyright (c) 2015 Twitter, Inc
+#
+
+test_description='Test merging of notes trees in multiple worktrees'
+
+. ./test-lib.sh
+
+test_expect_success 'setup commit' '
+ test_commit tantrum
+'
+
+commit_tantrum=$(git rev-parse tantrum^{commit})
+
+test_expect_success 'setup notes ref (x)' '
+ git config core.notesRef refs/notes/x &&
+ git notes add -m "x notes on tantrum" tantrum
+'
+
+test_expect_success 'setup local branch (y)' '
+ git update-ref refs/notes/y refs/notes/x &&
+ git config core.notesRef refs/notes/y &&
+ git notes remove tantrum
+'
+
+test_expect_success 'setup remote branch (z)' '
+ git update-ref refs/notes/z refs/notes/x &&
+ git config core.notesRef refs/notes/z &&
+ git notes add -f -m "conflicting notes on tantrum" tantrum
+'
+
+test_expect_success 'modify notes ref ourselves (x)' '
+ git config core.notesRef refs/notes/x &&
+ git notes add -f -m "more conflicting notes on tantrum" tantrum
+'
+
+test_expect_success 'create some new worktrees' '
+ git worktree add -b newbranch worktree master &&
+ git worktree add -b newbranch2 worktree2 master
+'
+
+test_expect_success 'merge z into y fails and sets NOTES_MERGE_REF' '
+ git config core.notesRef refs/notes/y &&
+ test_must_fail git notes merge z &&
+ echo "ref: refs/notes/y" >expect &&
+ test_cmp .git/NOTES_MERGE_REF expect
+'
+
+test_expect_success 'merge z into y while mid-merge in another workdir fails' '
+ (
+ cd worktree &&
+ git config core.notesRef refs/notes/y &&
+ test_must_fail git notes merge z 2>err &&
+ grep "A notes merge into refs/notes/y is already in-progress at" err
+ ) &&
+ test_path_is_missing .git/worktrees/worktree/NOTES_MERGE_REF
+'
+
+test_expect_success 'merge z into x while mid-merge on y succeeds' '
+ (
+ cd worktree2 &&
+ git config core.notesRef refs/notes/x &&
+ test_must_fail git notes merge z 2>&1 >out &&
+ grep "Automatic notes merge failed" out &&
+ grep -v "A notes merge into refs/notes/x is already in-progress in" out
+ ) &&
+ echo "ref: refs/notes/x" >expect &&
+ test_cmp .git/worktrees/worktree2/NOTES_MERGE_REF expect
+'
+
+test_done