} catch (UnsupportedOperationException tolerated) {
    }
    expectUnchanged();
  }

  @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_KEYS)
  public void testComputeIfAbsent_nullKeyUnsupported() {
    assertThrows(
        NullPointerException.class,
        () ->
            getMap()
                .computeIfAbsent(
                    null,
                    k -> {