lock_ref_sha1_basic(): improve diagnostics for ref D/F conflicts

diff --git a/t/t3200-branch.sh b/t/t3200-branch.sh
index 432921b6b81684313c6b0041a288749c30fdee8e..ddea49808d063f6c169cf8078f5698e34c2ba803 100755 (executable)
--- a/t/t3200-branch.sh
+++ b/t/t3200-branch.sh
@@ -97,6 +97,20 @@ test_expect_success 'git branch -m o/o o should fail when o/p exists' '
        test_must_fail git branch -m o/o o
 '
 
+test_expect_success 'git branch -m o/q o/p should fail when o/p exists' '
+       git branch o/q &&
+       test_must_fail git branch -m o/q o/p
+'
+
+test_expect_success 'git branch -M o/q o/p should work when o/p exists' '
+       git branch -M o/q o/p
+'
+
+test_expect_success 'git branch -m -f o/q o/p should work when o/p exists' '
+       git branch o/q &&
+       git branch -m -f o/q o/p
+'
+
 test_expect_success 'git branch -m q r/q should fail when r exists' '
        git branch q &&
        git branch r &&