* support concurrent multisets whose content may change while the method is running.
   *
   * <p>The serialized output consists of the number of distinct elements, the first element, its
   * count, the second element, its count, and so on.
   */
  static <E extends @Nullable Object> void writeMultiset(
      Multiset<E> multiset, ObjectOutputStream stream) throws IOException {

import org.junit.jupiter.params.provider.ValueSource;

/**
 * Test class for StringUtil utility methods
 */
class StringUtilTest {

    @Test
    @DisplayName("Should join single element without delimiter")
    void testJoinSingleElement() {
        String result = StringUtil.join(",", "hello");
        assertEquals("hello", result);
    }

    @Test

    assertTrue(
        "multiset.entrySet.remove(presentEntry) returned false",
        getMultiset().entrySet().remove(Multisets.immutableEntry(e0(), 1)));
    assertFalse("multiset contains element after removing its entry", getMultiset().contains(e0()));
  }

  @CollectionSize.Require(absent = ZERO)
  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testEntrySet_removeAbsent() {
    assertFalse(

        for (int i = 0, size = configuration.getChildCount(); i < size; i++) {
            final PlexusConfiguration element = configuration.getChild(i);
            final String propertyName = fromXML(element.getName());
            Class<?> valueType;
            try {
                valueType = getClassForImplementationHint(null, element, loader);
            } catch (final ComponentConfigurationException e) {
                valueType = null;

  private int position;

  /** Returns the element with the specified index. This method is called by {@link #next()}. */
  @ParametricNullness
  protected abstract E get(int index);

  /**
   * Constructs an iterator across a sequence of the given size whose initial position is 0. That
   * is, the first call to {@link #next()} will return the first element (or throw {@link
   * NoSuchElementException} if {@code size} is zero).

    }

    @Override
    public @Nullable E peek() {
      assertTrue(Thread.holdsLock(mutex));
      return delegate.peek();
    }

    @Override
    public E element() {
      assertTrue(Thread.holdsLock(mutex));
      return delegate.element();
    }

    @Override
    public Iterator<E> iterator() {
      // We explicitly don't lock for iterator()
      assertFalse(Thread.holdsLock(mutex));

        for (final int[] element : DOS_ERROR_CODES) {
            dosErrorCodeStatusesTmp.put(element[0], element[1]);
            final int mappedNtCode = element[1];
            final String mappedNtMessage = errorCodeMessagesTmp.get(mappedNtCode);
            if (mappedNtMessage != null) {
                errorCodeMessagesTmp.put(element[0], mappedNtMessage);
            }
        }

   *
   * <p><b>Java 8+ users:</b> Use {@code Streams.stream(iterator).min(thisComparator).get()} instead
   * (but note that it does not guarantee which tied minimum element is returned).
   *
   * @param iterator the iterator whose minimum element is to be determined
   * @throws NoSuchElementException if {@code iterator} is empty
   * @throws ClassCastException if the parameters are not <i>mutually comparable</i> under this

import javax.xml.transform.dom.DOMSource
import javax.xml.transform.stream.StreamResult
import org.w3c.dom.Document
import org.w3c.dom.Element
import org.w3c.dom.Node

class XIncludeAwareXmlProvider {

    Document root

    Element parse(File sourceFile) {
        root = parseSourceFile(sourceFile)
        root.documentElement
    }

    Node emptyDoc() {

@GwtCompatible
public interface PeekingIterator<E extends @Nullable Object> extends Iterator<E> {
  /**
   * Returns the next element in the iteration, without advancing the iteration.
   *
   * <p>Calls to {@code peek()} should not change the state of the iteration, except that it
   * <i>may</i> prevent removal of the most recent element via {@link #remove()}.
   *
   * @throws NoSuchElementException if the iteration has no more elements according to {@link