public void testHashCode_containingNull() {
    Collection<E> elements = getSampleElements(getNumElements() - 1);
    int expectedHashCode = 0;
    for (E element : elements) {
      expectedHashCode += ((element == null) ? 0 : element.hashCode());
    }

    elements.add(null);
    collection = getSubjectGenerator().create(elements.toArray());
    assertEquals(

            return typeElement.getQualifiedName().toString();
        }
        return null; // for ModuleElement, which is a top level element, this method currently returns 'null'
    }

    public static Element getTopLevelType(Element originatingElement) {
        Element current = originatingElement;
        Element parent = originatingElement;
        while (parent != null && !(parent instanceof PackageElement)) {
            current = parent;

    @Override
    public Builder<E> add(E... elements) {
      for (E element : elements) {
        add(element);
      }
      return this;
    }

    /**
     * Adds a number of occurrences of an element to this {@code ImmutableSortedMultiset}.
     *
     * @param element the element to add
     * @param occurrences the number of occurrences of the element to add. May be zero, in which

        markDuplicates(value);
        return true;
    }

    @Override
    protected void clearCachedElement(Element<T> element) {
        boolean wasRealized = element.isRealized();
        super.clearCachedElement(element);
        if (wasRealized) {
            for (T value : element.getValues()) {
                markDuplicates(value);
            }
        }
    }

    @Override
    public boolean remove(Object o) {

     *
     * @param elements the elements to add
     * @return this {@code Builder} object
     * @throws NullPointerException if {@code elements} is null or contains a null element
     */
    @CanIgnoreReturnValue
    @Override
    public Builder<E> add(E... elements) {
      super.add(elements);
      return this;
    }

    /**

//
//  1. Replace multiple slashes with a single slash.
//  2. Eliminate each . path name element (the current directory).
//  3. Eliminate each inner .. path name element (the parent directory)
//     along with the non-.. element that precedes it.
//  4. Eliminate .. elements that begin a rooted path:
//     that is, replace "/.." by "/" at the beginning of a path.
//

    final int hash;

    Element(int hash) {
      this.hash = hash;
    }

    @Override
    public boolean equals(@Nullable Object obj) {
      return this == obj || (obj instanceof Element && ((Element) obj).hash == hash);
    }

    @Override
    public int hashCode() {
      return hash;
    }

    @Override
    public int compareTo(Element that) {

    String getGeneratorCode() {
        def baseCode = """
for (Element element : elements) {
    TypeElement typeElement = (TypeElement) element;
    String className = typeElement.getSimpleName().toString() + "Helper";
    try {
        JavaFileObject sourceFile = filer.createSourceFile(className, ${withMultipleOriginatingElements ? "elements.toArray(new Element[0])" : "element"});
        Writer writer = sourceFile.openWriter();
        try {

	elementNone element = iota
	// elementScript corresponds to the raw text <script> element
	// with JS MIME type or no type attribute.
	elementScript
	// elementStyle corresponds to the raw text <style> element.
	elementStyle
	// elementTextarea corresponds to the RCDATA <textarea> element.
	elementTextarea
	// elementTitle corresponds to the RCDATA <title> element.
	elementTitle
)

            Node node = childs.item(i);
            if (node instanceof Element && name.equals(node.getNodeName())) {
                return (Element) node;
            }
        }
        return null;
    }

    public static List<Element> getAllChilds(Element parent) {
        List<Element> r = new LinkedList<>();
        if (parent != null) {
            NodeList childs = parent.getChildNodes();