added a fail if the exeception occurs

Author: qqmyers

src/test/java/edu/harvard/iq/dataverse/pidproviders/doi/datacite/XmlMetadataTemplateTest.java

@@ -212,6 +212,7 @@ public void testDataCiteXMLCreation() throws IOException {
                     new URL("https://schema.datacite.org/meta/kernel-4/metadata.xsd")));
         } catch (SAXException e) {
             System.out.println("Invalid schema: " + e.getMessage());
+            fail("Schema validation failed: " + e.getMessage());
         }
     }