@Test
public void makeNWiseTuplesTest() {

    NWiseExtension nWiseExtension = new NWiseExtension();
    List<Set<String>> tuples = nWiseExtension.makeNWiseTuples(new String[]{"A", "B", "C", "D", "E"}, 3);
    Assert.assertEquals(10, tuples.size());
    tuples = nWiseExtension.makeNWiseTuples(new String[]{"A", "B", "C", "D", "E"}, 2);
    Assert.assertEquals(10, tuples.size());
    tuples = nWiseExtension.makeNWiseTuples(new String[]{"A", "B", "C", "D", "E"}, 1);
    Assert.assertEquals(5, tuples.size());
}