import java.util.concurrent.Future;
import java.util.concurrent.atomic.AtomicInteger;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/**
 * Test case for {@link EventBus}.
 *
 * @author Cliff Biffle
 */
@NullUnmarked
public class EventBusTest extends TestCase {
  private static final String EVENT = "Hello";
  private static final String BUS_IDENTIFIER = "test-bus";

  private EventBus bus;

 * DeadEvent.
 *
 * <p>This class is safe for concurrent use.
 *
 * <p>See the Guava User Guide article on <a
 * href="https://github.com/google/guava/wiki/EventBusExplained">{@code EventBus}</a>.
 *
 * @author Cliff Biffle
 * @since 10.0
 */
public class EventBus {

  private static final Logger logger = Logger.getLogger(EventBus.class.getName());

  private final String identifier;
  private final Executor executor;