// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
@SuppressWarnings("JUnit4ClassUsedInJUnit3")
public class QueueElementTester<E> extends AbstractQueueTester<E> {
  @CollectionSize.Require(ZERO)
  public void testElement_empty() {
    assertThrows(NoSuchElementException.class, () -> getQueue().element());
    expectUnchanged();
  }

// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
@SuppressWarnings("JUnit4ClassUsedInJUnit3")
public class QueuePeekTester<E> extends AbstractQueueTester<E> {
  @CollectionSize.Require(ZERO)
  public void testPeek_empty() {
    assertNull("emptyQueue.peek() should return null", getQueue().peek());
    expectUnchanged();
  }

// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
@SuppressWarnings("JUnit4ClassUsedInJUnit3")
public class SetAddAllTester<E> extends AbstractSetTester<E> {
  @CollectionFeature.Require(SUPPORTS_ADD)
  @CollectionSize.Require(absent = ZERO)
  public void testAddAll_supportedSomePresent() {
    assertTrue(

import org.jspecify.annotations.Nullable;

/**
 * Generator for collection of a particular size.
 *
 * @author George van den Driessche
 */
@GwtCompatible
@NullMarked
public final class OneSizeGenerator<T, E extends @Nullable Object>
    implements OneSizeTestContainerGenerator<T, E> {
  private final TestContainerGenerator<T, E> generator;
  private final CollectionSize collectionSize;

import org.junit.runners.Parameterized.Parameters;

/** Tests for a directed {@link ImmutableNetwork}. */
@AndroidIncompatible
@RunWith(Parameterized.class)
@NullUnmarked
public class StandardImmutableDirectedNetworkTest extends AbstractStandardDirectedNetworkTest {

  @Parameters(name = "allowsSelfLoops={0}, allowsParallelEdges={1}, nodeOrder={2}, edgeOrder={3}")
  public static Collection<Object[]> parameters() {

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

/**
 * Test case for {@link AsyncEventBus}.
 *
 * @author Cliff Biffle
 */
@NullUnmarked
public class AsyncEventBusTest extends TestCase {
  private static final String EVENT = "Hello";

  /** The executor we use to fake asynchronicity. */
  private FakeExecutor executor;

  private AsyncEventBus bus;

  @Override

import org.jspecify.annotations.Nullable;

/**
 * Note this class is a copy of {@link com.google.common.collect.AbstractIterator} (for dependency
 * reasons).
 */
@GwtCompatible
abstract class AbstractIterator<T extends @Nullable Object> implements Iterator<T> {
  private State state = State.NOT_READY;

  protected AbstractIterator() {}

  private enum State {
    READY,
    NOT_READY,
    DONE,
    FAILED,
  }

import org.jspecify.annotations.NullUnmarked;

/**
 * Unit test for {@link Atomics}.
 *
 * @author Kurt Alfred Kluever
 */
@NullUnmarked
@GwtIncompatible
@J2ktIncompatible
public class AtomicsTest extends TestCase {

  private static final Object OBJECT = new Object();

  public void testNewReference() throws Exception {
    assertThat(Atomics.newReference().get()).isNull();
  }

import org.jspecify.annotations.NullUnmarked;

/** Unit tests for {@link ForwardingExecutorService} */
@NullUnmarked
@GwtIncompatible
@J2ktIncompatible
public class ForwardingExecutorServiceTest extends TestCase {
  public void testForwarding() {
    ForwardingObjectTester.testForwardingObject(ForwardingExecutorService.class);
  }

  public void testNoForwardingOfDefaultMethod() throws Exception {

// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
@SuppressWarnings("JUnit4ClassUsedInJUnit3")
public class SortedSetMultimapAsMapTester<K, V>
    extends AbstractMultimapTester<K, V, SortedSetMultimap<K, V>> {
  public void testAsMapValuesImplementSortedSet() {
    for (Collection<V> valueCollection : multimap().asMap().values()) {