t: test subject handling in format-patch / am pipeline

diff --git a/t/t7600-merge.sh b/t/t7600-merge.sh
index b4f40e4c3a53388e72347e8e3894edd05f17dab5..b147a1bd69e96e48d3808028a3775a609471639a 100755 (executable)
--- a/t/t7600-merge.sh
+++ b/t/t7600-merge.sh
@@ -144,6 +144,17 @@ test_expect_success 'test option parsing' '
        test_must_fail git merge
 '
 
+test_expect_success 'merge -h with invalid index' '
+       mkdir broken &&
+       (
+               cd broken &&
+               git init &&
+               >.git/index &&
+               test_expect_code 129 git merge -h 2>usage
+       ) &&
+       grep "[Uu]sage: git merge" broken/usage
+'
+
 test_expect_success 'reject non-strategy with a git-merge-foo name' '
        test_must_fail git merge -s index c1
 '