SUPPORTS_REMOVE_WITH_INDEX(CollectionFeature.SUPPORTS_REMOVE),

  GENERAL_PURPOSE(
      CollectionFeature.GENERAL_PURPOSE,
      SUPPORTS_SET,
      SUPPORTS_ADD_WITH_INDEX,
      SUPPORTS_REMOVE_WITH_INDEX),

  /** Features supported by lists where only removal is allowed. */
  REMOVE_OPERATIONS(CollectionFeature.REMOVE_OPERATIONS, SUPPORTS_REMOVE_WITH_INDEX);

  @ListFeature.Require(absent = SUPPORTS_REMOVE_WITH_INDEX)
  @CollectionSize.Require(absent = ZERO)
  public void testRemoveAtIndex_unsupported() {
    assertThrows(UnsupportedOperationException.class, () -> getList().remove(0));
    expectUnchanged();
  }

  @ListFeature.Require(SUPPORTS_REMOVE_WITH_INDEX)
  public void testRemoveAtIndex_negative() {

  SUPPORTS_REMOVE_WITH_INDEX(CollectionFeature.SUPPORTS_REMOVE),

  GENERAL_PURPOSE(
      CollectionFeature.GENERAL_PURPOSE,
      SUPPORTS_SET,
      SUPPORTS_ADD_WITH_INDEX,
      SUPPORTS_REMOVE_WITH_INDEX),

  /** Features supported by lists where only removal is allowed. */
  REMOVE_OPERATIONS(CollectionFeature.REMOVE_OPERATIONS, SUPPORTS_REMOVE_WITH_INDEX);

      derivedFeatures.add(ListFeature.SUPPORTS_ADD_WITH_INDEX);
    }
    if (derivedFeatures.contains(CollectionFeature.SUPPORTS_REMOVE)) {
      derivedFeatures.add(ListFeature.SUPPORTS_REMOVE_WITH_INDEX);
    }
    if (derivedFeatures.contains(CollectionFeature.GENERAL_PURPOSE)) {
      derivedFeatures.add(ListFeature.GENERAL_PURPOSE);
    }
    return derivedFeatures;
  }

  }

  @ListFeature.Require(SUPPORTS_REMOVE_WITH_INDEX)
  @CollectionSize.Require(absent = ZERO)
  public void testSubList_subListRemoveAffectsOriginal() {
    List<E> subList = getList().subList(0, 1);
    subList.remove(0);
    List<E> expected = asList(createSamplesArray()).subList(1, getNumElements());
    expectContents(expected);
  }

  @ListFeature.Require(SUPPORTS_REMOVE_WITH_INDEX)
  @CollectionSize.Require(absent = ZERO)

  }

  @ListFeature.Require(SUPPORTS_REMOVE_WITH_INDEX)
  @CollectionSize.Require(absent = ZERO)
  public void testSubList_subListRemoveAffectsOriginal() {
    List<E> subList = getList().subList(0, 1);
    subList.remove(0);
    List<E> expected = asList(createSamplesArray()).subList(1, getNumElements());
    expectContents(expected);
  }

  @ListFeature.Require(SUPPORTS_REMOVE_WITH_INDEX)
  @CollectionSize.Require(absent = ZERO)

      derivedFeatures.add(ListFeature.SUPPORTS_ADD_WITH_INDEX);
    }
    if (derivedFeatures.contains(CollectionFeature.SUPPORTS_REMOVE)) {
      derivedFeatures.add(ListFeature.SUPPORTS_REMOVE_WITH_INDEX);
    }
    if (derivedFeatures.contains(CollectionFeature.GENERAL_PURPOSE)) {
      derivedFeatures.add(ListFeature.GENERAL_PURPOSE);
    }
    return derivedFeatures;
  }

              }
            })
        .named("CopyOnWriteArrayList")
        .withFeatures(
            ListFeature.SUPPORTS_ADD_WITH_INDEX,
            ListFeature.SUPPORTS_REMOVE_WITH_INDEX,
            ListFeature.SUPPORTS_SET,
            CollectionFeature.SUPPORTS_ADD,
            CollectionFeature.SUPPORTS_REMOVE,
            CollectionFeature.SERIALIZABLE,

              }
            })
        .named("CopyOnWriteArrayList")
        .withFeatures(
            ListFeature.SUPPORTS_ADD_WITH_INDEX,
            ListFeature.SUPPORTS_REMOVE_WITH_INDEX,
            ListFeature.SUPPORTS_SET,
            CollectionFeature.SUPPORTS_ADD,
            CollectionFeature.SUPPORTS_REMOVE,
            CollectionFeature.SERIALIZABLE,

              CollectionFeature.FAILS_FAST_ON_CONCURRENT_MODIFICATION)
          .put(MapFeature.GENERAL_PURPOSE, ListFeature.SUPPORTS_ADD_WITH_INDEX)
          .put(MapFeature.GENERAL_PURPOSE, ListFeature.SUPPORTS_REMOVE_WITH_INDEX)
          .put(MapFeature.GENERAL_PURPOSE, ListFeature.SUPPORTS_SET)
          .put(MapFeature.ALLOWS_NULL_VALUE_QUERIES, CollectionFeature.ALLOWS_NULL_QUERIES)