diff --git a/tests/foo/1.0/ISimple.hal b/tests/foo/1.0/ISimple.hal
index 92e9d95..0d45835 100644
--- a/tests/foo/1.0/ISimple.hal
+++ b/tests/foo/1.0/ISimple.hal
@@ -18,4 +18,8 @@
 
 interface ISimple {
     getCookie() generates (int32_t cookie);
+    customVecInt() generates (vec<int32_t> chain);
+    customVecStr() generates (vec<string> chain);
+    mystr() generates (string str);
+    myhandle() generates (handle str);
 };