public class AbstractMultisetTester<E> extends AbstractCollectionTester<E> {
  protected final Multiset<E> getMultiset() {
    return (Multiset<E>) collection;
  }

  protected void initThreeCopies() {
    collection = getSubjectGenerator().create(e0(), e0(), e0());
  }

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

          parentBuilder,
      Bound from,
      Bound to) {
    TestSortedSetGenerator<E> delegate =
        (TestSortedSetGenerator<E>) parentBuilder.getSubjectGenerator().getInnerGenerator();

    List<Feature<?>> features = new ArrayList<>(parentBuilder.getFeatures());
    Set<Method> suppressing = new HashSet<>(parentBuilder.getSuppressedTests());

  @ListFeature.Require(SUPPORTS_SET)
  public void testSet_replacingNull() {
    E[] elements = createSamplesArray();
    int i = aValidIndex();
    elements[i] = null;
    collection = getSubjectGenerator().create(elements);

    doTestSet(e3());
  }

  private void doTestSet(E newValue) {
    int index = aValidIndex();
    E initialValue = getList().get(index);
    assertEquals(

  @Override
  public void setUp() throws Exception {
    super.setUp();
    sortedMultiset = (SortedMultiset<E>) getMultiset();
    entries =
        copyToList(
            getSubjectGenerator()
                .getSampleElements(getSubjectGenerator().getCollectionSize().getNumElements()));
    sort(entries, sortedMultiset.comparator());

    // some tests assume SEVERAL == 3
    if (entries.size() >= 1) {

  @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());

          Platform.format(
              "%s [collection size: %s]", name, collectionSize.toString().toLowerCase());
      OneSizeGenerator<T, E> oneSizeGenerator =
          new OneSizeGenerator<>(getSubjectGenerator(), (CollectionSize) collectionSize);
      Set<Feature<?>> oneSizeFeatures = copyToSet(features);
      oneSizeFeatures.add(collectionSize);
      Set<Method> oneSizeSuppressedTests = getSuppressedTests();

  /**
   * @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));
    }

    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).",