@Test public void whenCreateRangeSet_thenCreated() { final RangeSet<Integer> rangeSet = TreeRangeSet.create(); rangeSet.add(Range.closed(1, 10)); rangeSet.add(Range.closed(12, 15)); assertEquals(2, rangeSet.asRanges().size()); rangeSet.add(Range.closed(10, 12)); assertTrue(rangeSet.encloses(Range.closed(1, 15))); assertEquals(1, rangeSet.asRanges().size()); }