nnm = doc.getAttributes(); // Should be null, because node type
// is not Element.
Assertion.verify(nnm == null);
Assertion.verify(!(nnm != null));
Element el = doc.createElement("NamedNodeMap01");
NamedNodeMap nnm2 = el.getAttributes(); // Should be an empty, but non-null map.
Assertion.verify(nnm2 != null);
Assertion.verify(nnm != nnm2);
nnm = nnm2;
Assertion.verify(nnm == nnm2);