Coffeehouse Junit

import akka.actor.ActorIdentity;
import akka.actor.ActorRef;
import akka.actor.ActorSystem;
import akka.event.Logging;
import akka.testkit.JavaTestKit;
import akka.testkit.TestProbe;
import com.typesafe.training.coffeehouse.CoffeeHouse;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import scala.concurrent.duration.Duration;
import static org.junit.Assert.*;

@RunWith(JUnit4.class)
public class CoffeeHouseTest {

    static ActorSystem system;

    @BeforeClass
    public static void setup() {
        system = ActorSystem.create();
    }

    @AfterClass
    public static void teardown() {
        JavaTestKit.shutdownActorSystem(system);
        system = null;
    }

    @Test
    public void creatingCoffeeHouseDebug() {
        new JavaTestKit(system) {{
            new EventFilter<Void>(Logging.Debug.class) {
                protected Void run() {
                    system.actorOf(CoffeeHouse.props());
                    return null;
                }
            }.matches(".*[Oo]pen.*").occurrences(1).exec();
        }};
    }

    @Test
    public void creatingNewGuestActors() {
        new JavaTestKit(system) {{
            ActorRef coffeeHouse = system.actorOf(CoffeeHouse.props(), "create-guest");
            final String guestPath = "/user/create-guest/$*";
            coffeeHouse.tell(CoffeeHouse.CreateGuest.Instance, null);
            new AwaitAssert(duration("1 minute"), duration("200 millis")) {
                @Override
                protected void check() {
                    system.actorSelection(guestPath)
                            .tell(new akka.actor.Identify(101), getRef());
                    ActorIdentity i =
                            expectMsgClass(duration("100 millis"), ActorIdentity.class);
                    assertEquals(i.correlationId(), 101);
                    assertNotNull(i.getRef());

                }
            };
        }};
    }

}