@Test
public void testNbOfCombinationsAbove() {

  HashSet<Integer> set = new HashSet<Integer>();
  set.add(1);
  set.add(2);
  set.add(3);
  CombinationSet combiSet = new CombinationSet(set);
  Assert.assertTrue(combiSet.nbOfCombinationsAbove(2) == 4);
}