format-patch: introduce format.useAutoBase configuration

diff --git a/t/t2025-worktree-add.sh b/t/t2025-worktree-add.sh
index 0a804dab634d0a72bfabd8826d0cb38e1b4f7dbc..cbfa41ec61b9f893b4df441e0289a5313ccaf413 100755 (executable)
--- a/t/t2025-worktree-add.sh
+++ b/t/t2025-worktree-add.sh
@@ -193,6 +193,21 @@ test_expect_success '"add" -B/--detach mutually exclusive' '
        test_must_fail git worktree add -B poodle --detach bamboo master
 '
 
+test_expect_success '"add -B" fails if the branch is checked out' '
+       git rev-parse newmaster >before &&
+       test_must_fail git worktree add -B newmaster bamboo master &&
+       git rev-parse newmaster >after &&
+       test_cmp before after
+'
+
+test_expect_success 'add -B' '
+       git worktree add -B poodle bamboo2 master^ &&
+       git -C bamboo2 symbolic-ref HEAD >actual &&
+       echo refs/heads/poodle >expected &&
+       test_cmp expected actual &&
+       test_cmp_rev master^ poodle
+'
+
 test_expect_success 'local clone from linked checkout' '
        git clone --local here here-clone &&
        ( cd here-clone && git fsck )