* Tests whether the instance hash of the findbugs library is correctly used.
*/
@Test
public void testInstanceHash() {
AnnotationStream xstream = new AnnotationStream();
xstream.alias("bug", Bug.class);
InputStream stream = BugsDifferencerTest.class.getResourceAsStream("issue-6669-1.xml");
FileAnnotation[] current;
try {
current = (FileAnnotation[])xstream.fromXML(stream);