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
  protected void setUp() throws Exception {

    return new PerThreadQueuedDispatcher();
  }

  /**
   * Returns a dispatcher that queues events that are posted in a single global queue. This behavior
   * matches the original behavior of AsyncEventBus exactly, but is otherwise not especially useful.
   * For async dispatch, an {@linkplain #immediate() immediate} dispatcher should generally be
   * preferable.
   */
  static Dispatcher legacyAsync() {