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 &&