diff --git a/tests/modules/yang/sm-extension.yang b/tests/modules/yang/sm-extension.yang
new file mode 100644
index 0000000..63d164a
--- /dev/null
+++ b/tests/modules/yang/sm-extension.yang
@@ -0,0 +1,17 @@
+module sm-extension {
+  yang-version 1.1;
+  namespace "urn:sm-ext";
+  prefix "sm-ext";
+
+  list tlist {
+    key "name";
+    leaf name {
+      type uint32;
+    }
+  }
+  container tcont {
+    leaf tleaf {
+      type uint32;
+    }
+  }
+}