Serializer Helper Utility fix

Change-Id: I4bf7e2d6b5c810397bf27b405e5c7b354d74ca34
diff --git a/runtime/src/test/resources/schemaProviderTestYangFiles/list.yang b/runtime/src/test/resources/schemaProviderTestYangFiles/list.yang
index fcc67eb..122ce11 100644
--- a/runtime/src/test/resources/schemaProviderTestYangFiles/list.yang
+++ b/runtime/src/test/resources/schemaProviderTestYangFiles/list.yang
@@ -34,4 +34,8 @@
                 }
             }
     }
+
+    leaf-list leaf1 {
+        type string;
+    }
 }
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