newSubCat.getSubcategories().add(cat);
cat.setName("new new foo");
s = openSession();
newSubCat = (Category) s.saveOrUpdateCopy( newSubCat, new Long( newSubCat.getId() ) );
assertTrue( newSubCat.getName().equals("new sub") );
assertTrue( newSubCat.getSubcategories().size()==1 );
cat = (Category) newSubCat.getSubcategories().get(0);
assertTrue( cat.getName().equals("new new foo") );
newSubCat.getSubcategories().remove(cat);