*
 * <p>This class does not implement {@link java.util.RandomAccess}. If the delegate supports random
 * access, the {@code ForwardingList} subclass should implement the {@code RandomAccess} interface.
 *
 * <p><b>Warning:</b> The methods of {@code ForwardingList} forward <b>indiscriminately</b> to the
 * methods of the delegate. For example, overriding {@link #add} alone <b>will not</b> change the

import org.jspecify.annotations.NullUnmarked;
import org.jspecify.annotations.Nullable;

/**
 * Tests for {@code ForwardingList}.
 *
 * @author Robert Konigsberg
 * @author Louis Wasserman
 */
@NullUnmarked
public class ForwardingListTest extends TestCase {
  static final class StandardImplForwardingList<T> extends ForwardingList<T> {
    private final List<T> backingList;

    StandardImplForwardingList(List<T> backingList) {

 * JDK's collection wrappers, such as {@link java.util.Collections#unmodifiableCollection}. Use an
 * interface-specific subclass of {@code ForwardingObject}, such as {@link ForwardingList}, to
 * preserve equality behavior, or override {@code equals} directly.
 *
 * <p>The {@code toString} method is forwarded to the delegate. Although this class does not

 * JDK's collection wrappers, such as {@link java.util.Collections#unmodifiableCollection}. Use an
 * interface-specific subclass of {@code ForwardingObject}, such as {@link ForwardingList}, to
 * preserve equality behavior, or override {@code equals} directly.
 *
 * <p>The {@code toString} method is forwarded to the delegate. Although this class does not

    protected Set<V> delegate() {
      return emptySet();
    }
  }

  private static final class AddRejectingList<
          K extends @Nullable Object, V extends @Nullable Object>
      extends ForwardingList<V> {
    @ParametricNullness final K key;

    AddRejectingList(@ParametricNullness K key) {
      this.key = key;
    }

    @Override
    public boolean add(@ParametricNullness V v) {

    protected Set<V> delegate() {
      return emptySet();
    }
  }

  private static final class AddRejectingList<
          K extends @Nullable Object, V extends @Nullable Object>
      extends ForwardingList<V> {
    @ParametricNullness final K key;

    AddRejectingList(@ParametricNullness K key) {
      this.key = key;
    }

    @Override
    public boolean add(@ParametricNullness V v) {

import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.base.Joiner.MapJoiner;
import com.google.common.collect.ForwardingList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.testing.NullPointerTester;
import java.io.IOException;
import java.util.Arrays;

    }

    @Override
    protected Set<E> delegate() {
      return infiniteCandidates.next();
    }
  }

  private static final class MutatedOnQueryList<E> extends ForwardingList<E> {
    final Iterator<ImmutableList<E>> infiniteCandidates;

    MutatedOnQueryList(Iterable<ImmutableList<E>> infiniteCandidates) {
      this.infiniteCandidates = infiniteCandidates.iterator();
    }

    assertTrue(elementsEqual(transform, transform(randomAccessList, SOME_FUNCTION)));
  }

  private static class ListIterationOnlyList<E> extends ForwardingList<E> {
    private final List<E> realDelegate;

    private ListIterationOnlyList(List<E> realDelegate) {
      this.realDelegate = realDelegate;
    }

    @Override
    public int size() {

              @Override
              public List<String> create(String[] elements) {
                List<String> delegate = newArrayList(elements);
                return new ForwardingList<String>() {
                  @Override
                  protected List<String> delegate() {
                    return delegate;
                  }

                  @Override