diff: introduce diff.submodule configuration variable

diff --git a/t/t6028-merge-up-to-date.sh b/t/t6028-merge-up-to-date.sh
index a91644e3b2ac3490cfe49d5e67c9736197cd56a1..c518e9c30ccbb12c504d25aa965f8941a3989d8d 100755 (executable)
--- a/t/t6028-merge-up-to-date.sh
+++ b/t/t6028-merge-up-to-date.sh
@@ -16,7 +16,12 @@ test_expect_success setup '
        test_tick &&
        git commit -m second &&
        git tag c1 &&
-       git branch test
+       git branch test &&
+       echo third >file &&
+       git add file &&
+       test_tick &&
+       git commit -m third &&
+       git tag c2
 '
 
 test_expect_success 'merge -s recursive up-to-date' '
@@ -74,4 +79,14 @@ test_expect_success 'merge -s subtree up-to-date' '
 
 '
 
+test_expect_success 'merge fast-forward octopus' '
+
+       git reset --hard c0 &&
+       test_tick &&
+       git merge c1 c2
+       expect=$(git rev-parse c2) &&
+       current=$(git rev-parse HEAD) &&
+       test "$expect" = "$current"
+'
+
 test_done