rangeMap.putCoalescing(Range.closedOpen(2, 3), 2);
    assertEquals(
        ImmutableMap.of(Range.closedOpen(0, 2), 1, Range.closedOpen(2, 3), 2),
        rangeMap.asMapOfRanges());
  }

  public void testPutCoalescingEmpty() {
    RangeMap<Integer, Integer> rangeMap = TreeRangeMap.create();
    rangeMap.put(Range.closedOpen(0, 1), 1);
    rangeMap.put(Range.closedOpen(1, 2), 1);
    assertEquals(