public void testRescorer() throws Exception {
List<User> users = new ArrayList<User>(3);
users.add(getUser("test1", 0.1, 0.2));
users.add(getUser("test2", 0.2, 0.3, 0.3, 0.6));
users.add(getUser("test3", 0.4, 0.4, 0.5, 0.9));
DataModel dataModel = new GenericDataModel(users);
Item item1 = new GenericItem<String>("0");
Item item2 = new GenericItem<String>("1");
Item item3 = new GenericItem<String>("2");
Item item4 = new GenericItem<String>("3");
Collection<GenericItemSimilarity.ItemItemSimilarity> similarities =