@Test
  public void whenCreateRangeOfIntegersSet_thenCreated() {
    final int start = 10;
    final int end = 30;
    final ContiguousSet<Integer> set =
        ContiguousSet.create(Range.closed(start, end), DiscreteDomain.integers());

    assertEquals(21, set.size());
    assertEquals(10, set.first().intValue());
    assertEquals(30, set.last().intValue());
  }