@Test
public void testFastCandidates() {

    IntStream candidates = IntStream.of(1, 3, 5);
    
    List<Tuple2id> result = recommender.getRecommendation(0, candidates).getIidxs();
    List<Tuple2id> expected = Arrays.asList(
            tuple(1, 5.0),
            tuple(3, 3.0),
            tuple(5, 1.0)
    );
    
    assertEquals(expected, result);
}