match-trees: use hashcpy to splice trees

diff --git a/t/t5516-fetch-push.sh b/t/t5516-fetch-push.sh
index 7a8f56db53eb6c3b869d525501c186bd2df1ba0a..37e8e80893dad130c5c00882796047417aae115b 100755 (executable)
--- a/t/t5516-fetch-push.sh
+++ b/t/t5516-fetch-push.sh
@@ -95,7 +95,7 @@ mk_child() {
 
 check_push_result () {
        test $# -ge 3 ||
-       error "bug in the test script: check_push_result requires at least 3 parameters"
+       BUG "check_push_result requires at least 3 parameters"
 
        repo_name="$1"
        shift
@@ -1577,7 +1577,13 @@ test_expect_success 'receive.denyCurrentBranch = updateInstead' '
                test $(git -C .. rev-parse master) = $(git rev-parse HEAD) &&
                git diff --quiet &&
                git diff --cached --quiet
-       )
+       ) &&
+
+       # (6) updateInstead intervened by fast-forward check
+       test_must_fail git push void master^:master &&
+       test $(git -C void rev-parse HEAD) = $(git rev-parse master) &&
+       git -C void diff --quiet &&
+       git -C void diff --cached --quiet
 '
 
 test_expect_success 'updateInstead with push-to-checkout hook' '