final Map<String, String> base = new LinkedHashMap<String, String>(1);
base.put("foo", "woot");
final DiffNode node = ObjectDifferBuilder.buildDefault().compare(working, base);
NodeAssertions.assertThat(node).self().hasChildren(1);
NodeAssertions.assertThat(node).child(new MapKeyElementSelector("foo")).hasState(DiffNode.State.CHANGED);
}