.build();

    assertThrows(UnsupportedOperationException.class, () -> rangeSet.remove(Range.closed(6, 7)));
  }

  @SuppressWarnings("DoNotCall")
  public void testRemoveAllUnsupported() {
    RangeSet<Integer> rangeSet =
        ImmutableRangeSet.<Integer>builder()
            .add(Range.closed(5, 8))
            .add(Range.closedOpen(1, 3))
            .build();

    assertThrows(