assertEquals(-1L, model.nextNews(false, 3L));
assertEquals(1L, model.nextNews(false, 5L));
assertEquals(3L, model.previousNews(false, -1L));
assertEquals(3L, model.previousNews(true, -1L));
assertEquals(-1L, model.previousNews(false, 1L));
assertEquals(-1L, model.previousNews(true, 1L));
assertEquals(2L, model.previousNews(false, 3L));
assertEquals(1L, model.previousNews(true, 3L));
assertEquals(3L, model.previousNews(true, 5L));
assertEquals(3L, model.previousNews(false, 5L));