Dump the XML documents for any kind of exception, not just for assertion failures.
diff --git a/modules/axiom-testsuite/src/main/java/org/apache/axiom/ts/om/container/TestSerialize.java b/modules/axiom-testsuite/src/main/java/org/apache/axiom/ts/om/container/TestSerialize.java
index 7cd6a94..96a4c16 100644
--- a/modules/axiom-testsuite/src/main/java/org/apache/axiom/ts/om/container/TestSerialize.java
+++ b/modules/axiom-testsuite/src/main/java/org/apache/axiom/ts/om/container/TestSerialize.java
@@ -63,7 +63,7 @@
                 InputSource actual[] = duplicateInputSource(serializationMethod.serialize(container));
                 try {
                     XMLAssert.assertXMLIdentical(XMLUnit.compareXML(control[0], actual[0]), true);
-                } catch (AssertionFailedError ex) {
+                } catch (Throwable ex) {
                     System.out.println("Control:");
                     dumpInputSource(control[1]);
                     System.out.println("Actual:");