int expectedHashCode = 0;
    for (E element : elements) {
      expectedHashCode += (element == null) ? 0 : element.hashCode();
    }

    elements.add(null);
    collection = getSubjectGenerator().create(elements.toArray());
    assertEquals(
        "A Set's hashCode() should be the sum of those of its elements (with "
            + "a null element counting as having a hash of zero).",
        expectedHashCode,

    entries.add(entryWithNull);

    int expectedHashCode = 0;
    for (Entry<K, V> entry : entries) {
      expectedHashCode += hash(entry);
    }

    resetContainer(getSubjectGenerator().create(entries.toArray()));
    assertEquals(
        "A Map's hashCode() should be the sum of those of its entries (where "
            + "a null element in an entry counts as having a hash of zero).",

  /**
   * @see AbstractContainerTester#resetContainer()
   */
  protected final void resetMap() {
    resetContainer();
  }

  protected void resetMap(Entry<K, V>[] entries) {
    resetContainer(getSubjectGenerator().create((Object[]) entries));
  }

  protected void expectMissingKeys(K... elements) {
    for (K element : elements) {
      assertFalse("Should not contain key " + element, getMap().containsKey(element));
    }

      FeatureSpecificTestSuiteBuilder<?, ? extends OneSizeTestContainerGenerator<Collection<E>, E>>
          parentBuilder) {
    TestSetGenerator<E> delegate =
        (TestSetGenerator<E>) parentBuilder.getSubjectGenerator().getInnerGenerator();

    List<Feature<?>> features = new ArrayList<>();
    features.add(DESCENDING_VIEW);
    features.addAll(parentBuilder.getFeatures());

    return NavigableSetTestSuiteBuilder.using(

    if (parentBuilder.getFeatures().contains(SERIALIZABLE)) {
      derivedSuites.add(
          ListTestSuiteBuilder.using(
                  new ReserializedListGenerator<E>(parentBuilder.getSubjectGenerator()))
              .named(getName() + " reserialized")
              .withFeatures(computeReserializedCollectionFeatures(parentBuilder.getFeatures()))
              .suppressing(parentBuilder.getSuppressedTests())

  }

  // public so that it can be referenced in generated GWT tests.
  public final void init(G subjectGenerator, String suiteName) {
    init(subjectGenerator, suiteName, null, null);
  }

  public G getSubjectGenerator() {
    return subjectGenerator;
  }

  /** Returns the name of the test method invoked by this test instance. */
  @J2ktIncompatible

  }

  // public so that it can be referenced in generated GWT tests.
  public final void init(G subjectGenerator, String suiteName) {
    init(subjectGenerator, suiteName, null, null);
  }

  public G getSubjectGenerator() {
    return subjectGenerator;
  }

  /** Returns the name of the test method invoked by this test instance. */
  @J2ktIncompatible

    if (parentBuilder.getFeatures().contains(SERIALIZABLE)) {
      derivedSuites.add(
          ListTestSuiteBuilder.using(
                  new ReserializedListGenerator<E>(parentBuilder.getSubjectGenerator()))
              .named(getName() + " reserialized")
              .withFeatures(computeReserializedCollectionFeatures(parentBuilder.getFeatures()))
              .suppressing(parentBuilder.getSuppressedTests())

              ?, ? extends OneSizeTestContainerGenerator<Map<K, V>, Entry<K, V>>>
          parentBuilder) {
    TestSortedMapGenerator<K, V> delegate =
        (TestSortedMapGenerator<K, V>) parentBuilder.getSubjectGenerator().getInnerGenerator();

    List<Feature<?>> features = new ArrayList<>();
    features.add(NoRecurse.DESCENDING);
    features.addAll(parentBuilder.getFeatures());

  @SuppressWarnings("UndefinedEquals")
  private void assertCleared() {
    assertEquals(0, multimap().size());
    assertEmpty(multimap());
    assertEquals(multimap(), getSubjectGenerator().create());
    assertEmpty(multimap().entries());
    assertEmpty(multimap().asMap());
    assertEmpty(multimap().keySet());
    assertEmpty(multimap().keys());
    assertEmpty(multimap().values());