@Test
public void testStdFilter() {

    int maxLength = Integer.MAX_VALUE;
    Predicate<String> filter = item -> true;
    
    List<Tuple2od<String>> result = recommender.getRecommendation("0", maxLength, filter).getItems();
    List<Tuple2od<String>> expected = Arrays.asList(
            tuple("0", 6.0),
            tuple("1", 5.0),
            tuple("2", 4.0),
            tuple("3", 3.0),
            tuple("4", 2.0),
            tuple("5", 1.0)
    );
    
    assertEquals(expected, result);
}