diff --git a/extensions/libxt_owner.t b/extensions/libxt_owner.t
new file mode 100644
index 0000000..aec30b6
--- /dev/null
+++ b/extensions/libxt_owner.t
@@ -0,0 +1,12 @@
+:OUTPUT,POSTROUTING
+*mangle
+-m owner --uid-owner root;-m owner --uid-owner 0;OK
+-m owner --uid-owner 0-10;=;OK
+-m owner --gid-owner root;-m owner --gid-owner 0;OK
+-m owner --gid-owner 0-10;=;OK
+-m owner --uid-owner root --gid-owner root;-m owner --uid-owner 0 --gid-owner 0;OK
+-m owner --uid-owner 0-10 --gid-owner 0-10;=;OK
+-m owner ! --uid-owner root;-m owner ! --uid-owner 0;OK
+-m owner --socket-exists;=;OK
+:INPUT
+-m owner --uid-owner root;;FAIL