* worth having a test to ensure that all our Feature enums have their annotations correctly set up.
 *
 * @author George van den Driessche
 */
public class FeatureEnumTest extends TestCase {
  private static void assertGoodTesterAnnotation(Class<? extends Annotation> annotationClass) {
    assertWithMessage(
            rootLocaleFormat("%s must be annotated with @TesterAnnotation.", annotationClass))

 *
 * @author Jared Levy
 */
@GwtCompatible
@SuppressWarnings("serial") // we're overriding default serialization
final class ImmutableEnumSet<E extends Enum<E>> extends ImmutableSet<E> {
  static <E extends Enum<E>> ImmutableSet<E> asImmutable(EnumSet<E> set) {
    switch (set.size()) {
      case 0:
        return ImmutableSet.of();
      case 1:
        return ImmutableSet.of(getOnlyElement(set));

 *
 * @author Sven Mawson
 * @since 1.0
 */
@GwtCompatible
public abstract class ForwardingFuture<V extends @Nullable Object> extends ForwardingObject
    implements Future<V> {
  /** Constructor for use by subclasses. */
  protected ForwardingFuture() {}

  @Override
  protected abstract Future<? extends V> delegate();

  @Override
  @CanIgnoreReturnValue
  public boolean cancel(boolean mayInterruptIfRunning) {

 */
@GwtCompatible
@NullMarked
public class MinimalCollection<E extends @Nullable Object> extends AbstractCollection<E> {
  // TODO: expose allow nulls parameter?

  public static <E extends @Nullable Object> MinimalCollection<E> of(E... contents) {
    return new MinimalCollection<>(Object.class, true, contents);
  }

  // TODO: use this
  public static <E extends @Nullable Object> MinimalCollection<E> ofClassAndContents(

   */
  private static final class TransformingSequentialList<
          F extends @Nullable Object, T extends @Nullable Object>
      extends AbstractSequentialList<T> implements Serializable {
    final List<F> fromList;
    final Function<? super F, ? extends T> function;

    TransformingSequentialList(List<F> fromList, Function<? super F, ? extends T> function) {
      this.fromList = checkNotNull(fromList);

 * invoke methods, they invoke methods on the {@code ForwardingSetMultimap}.
 *
 * @author Kurt Alfred Kluever
 * @since 3.0
 */
@GwtCompatible
public abstract class ForwardingSetMultimap<K extends @Nullable Object, V extends @Nullable Object>
    extends ForwardingMultimap<K, V> implements SetMultimap<K, V> {
  /** Constructor for use by subclasses. */
  public ForwardingSetMultimap() {}

  @Override

     */
    LAST_BEFORE {
      @Override
      public <E extends @Nullable Object> int resultIndex(
          Comparator<? super E> comparator,
          @ParametricNullness E key,
          List<? extends E> list,
          int foundIndex) {
        return FIRST_PRESENT.resultIndex(comparator, key, list, foundIndex) - 1;
      }
    };

    abstract <E extends @Nullable Object> int resultIndex(

  public static <K, V> ImmutableSortedMap<K, V> copyOf(
      Iterable<? extends Entry<? extends K, ? extends V>> entries) {
    return new Builder<K, V>((Comparator<K>) NATURAL_ORDER).putAll(entries).build();
  }

  public static <K, V> ImmutableSortedMap<K, V> copyOf(
      Iterable<? extends Entry<? extends K, ? extends V>> entries,
      Comparator<? super K> comparator) {

   */
  private static final class CompositionPredicate<
          A extends @Nullable Object, B extends @Nullable Object>
      implements Predicate<A>, Serializable {
    final Predicate<B> p;
    final Function<A, ? extends B> f;

    private CompositionPredicate(Predicate<B> p, Function<A, ? extends B> f) {
      this.p = checkNotNull(p);
      this.f = checkNotNull(f);
    }

    @Override

import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

@NullUnmarked
@GwtIncompatible
@J2ktIncompatible
public final class ListeningExecutorServiceTest extends TestCase {

  private Collection<? extends Callable<?>> recordedTasks;
  private long recordedTimeout;
  private TimeUnit recordedTimeUnit;

  private final ListeningExecutorService executorService = new FakeExecutorService();