.inOrder();
    assertThat(rangeSet.complement().asRanges())
        .containsExactly(Range.closedOpen(3, 4), Range.greaterThan(6))
        .inOrder();
  }

  public void testRemoveNoOverlap() {
    TreeRangeSet<Integer> rangeSet = TreeRangeSet.create();
    rangeSet.add(Range.closed(3, 6));
    rangeSet.remove(Range.closedOpen(1, 3));
    testInvariants(rangeSet);