update-ref: fix "verify" command with missing <oldvalue>

diff --git a/t/t2024-checkout-dwim.sh b/t/t2024-checkout-dwim.sh
index 094b92ef489156980dc1429136d5dad25d01ac7d..6ecb559465b43e528a5cb1511b758cc48d940e92 100755 (executable)
--- a/t/t2024-checkout-dwim.sh
+++ b/t/t2024-checkout-dwim.sh
@@ -164,4 +164,25 @@ test_expect_success 'checkout of branch from a single remote succeeds #4' '
        test_branch_upstream eggs repo_d eggs
 '
 
+test_expect_success 'checkout of branch with a file having the same name fails' '
+       git checkout -B master &&
+       test_might_fail git branch -D spam &&
+
+       >spam &&
+       test_must_fail git checkout spam &&
+       test_must_fail git rev-parse --verify refs/heads/spam &&
+       test_branch master
+'
+
+test_expect_success 'checkout <branch> -- succeeds, even if a file with the same name exists' '
+       git checkout -B master &&
+       test_might_fail git branch -D spam &&
+
+       >spam &&
+       git checkout spam -- &&
+       test_branch spam &&
+       test_cmp_rev refs/remotes/extra_dir/repo_c/extra_dir/spam HEAD &&
+       test_branch_upstream spam repo_c spam
+'
+
 test_done