extensions: libxt_state: add unit test

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
diff --git a/extensions/libxt_state.t b/extensions/libxt_state.t
new file mode 100644
index 0000000..8e4bce3
--- /dev/null
+++ b/extensions/libxt_state.t
@@ -0,0 +1,6 @@
+:INPUT,FORWARD,OUTPUT
+-m state --state INVALID;=;OK
+-m state --state NEW,RELATED;=;OK
+-m state --state UNTRACKED;=;OK
+-m state wrong;;FAIL
+-m state;;FAIL