diff --git a/XMLTest.java b/XMLTest.java
index f680e18..fb3b42c 100644
--- a/XMLTest.java
+++ b/XMLTest.java
@@ -189,7 +189,8 @@ public class XMLTest {
     @Test
     public void shouldHandleNullJSONXML() {
         JSONObject jsonObject= null;
-        XML.toString(jsonObject);
+        String actualXml=XML.toString(jsonObject);
+        assertEquals("generated XML does not equal expected XML","\"null\"",actualXml);
     }
 
     /**