hooks: Add function to check if a hook exists

diff --git a/t/t2203-add-intent.sh b/t/t2203-add-intent.sh
index ec35409f9cbe9bcdd3d21a6a5a15996b165d2fff..2a4a749b4fa3b07963a18b645d29ef774c01bbd1 100755 (executable)
--- a/t/t2203-add-intent.sh
+++ b/t/t2203-add-intent.sh
@@ -62,5 +62,25 @@ test_expect_success 'can "commit -a" with an i-t-a entry' '
        git commit -a -m all
 '
 
+test_expect_success 'cache-tree invalidates i-t-a paths' '
+       git reset --hard &&
+       mkdir dir &&
+       : >dir/foo &&
+       git add dir/foo &&
+       git commit -m foo &&
+
+       : >dir/bar &&
+       git add -N dir/bar &&
+       git diff --cached --name-only >actual &&
+       echo dir/bar >expect &&
+       test_cmp expect actual &&
+
+       git write-tree >/dev/null &&
+
+       git diff --cached --name-only >actual &&
+       echo dir/bar >expect &&
+       test_cmp expect actual
+'
+
 test_done