RangeMap<Integer, Integer> sub2 = sub1.subRangeMap(Range.open(6, 15));
    assertEquals(
        ImmutableMap.of(Range.open(6, 7), 1, Range.closed(9, 10), 2), sub2.asMapOfRanges());
  }

  public void testSubRangeMapPut() {
    RangeMap<Integer, Integer> rangeMap = TreeRangeMap.create();
    rangeMap.put(Range.open(3, 7), 1);
    rangeMap.put(Range.closed(9, 10), 2);
    rangeMap.put(Range.closed(12, 16), 3);