diff --git a/Jdempotent-core/src/test/java/aspect/core/TestIdempotentResource.java b/Jdempotent-core/src/test/java/aspect/core/TestIdempotentResource.java
index 96d1d31..d5656e5 100644
--- a/Jdempotent-core/src/test/java/aspect/core/TestIdempotentResource.java
+++ b/Jdempotent-core/src/test/java/aspect/core/TestIdempotentResource.java
@@ -36,4 +36,8 @@ public IdempotentTestPayload idempotentMethodReturnArg(IdempotentTestPayload tes
         return testObject;
     }
 
+    @IdempotentResource
+    public String idempotencyKeyAsString(@IdempotentRequestPayload String idempotencyKey) {
+        return idempotencyKey;
+    }
 }
\ No newline at end of file