在单元测试中，演员如何处理所有消息？

Question

我在我们的产品中使用 Akka actor。我们写了一些代码：

   @Singleton

   public class SingletonObj {

      private Map<String, Integer> cached = new HashMap();

      public void set(String key, Integer value) {

         cached.put(key, value);

      }

      public void delete(String key){

         cached.delete(key}

      }

   }

   public class MyActor  extends AbstractActor implements InjectedActorSupport {

       @Inject SingletonObj singletonObj;

        public static Props props(Injector injector) {

        return Props.create(MyActor.class, injector);

    }

    public MyActor(Injector injector) {

        this.injector = injector;

        receive(ReceiveBuilder.create()

            .match(AddEvent.class, this::addEvent)

            .match(DeteteEvent.class, this::deleteEvent))

            .build());

        }

        private void addEvent(AddEvent addEvent) {singletonObj.set(addEvent.key, addEvent.value);}

        private void deteleEvent(DeteteEvent event){singletonObj.detele(event.key);}

   }

   public class Controller {

       private Injector injector;

       private ActorSystem actorSystem;

       public void handleAdd()...

       public void handleDelete()...

   }

然后当我junit为这些课程写一些测试时

   @Test public void testMethod(){

       sendAddRequest(...);

       sendDeteleRequest(...)

       ...

       ...

       assertThat(singletonObj.get("someString")).isEqual(42)

    }

那么这个测试是不可靠的，因为当我断言时，所有事件都没有被处理。

我如何等待 actor 系统中的所有事件完成？

Answer 1

导入下面的包，然后你可以等待直到你处理完所有事件，否则测试将在超时后失败。testCompile 'org.awaitility:awaitility:3.1.0'import org.awaitility.Awaitility;在你使用 assertThat 之前await().pollInterval(5, TimeUnit.MILLISECONDS).until(() -> !isProcessed());isProcessed 方法如下所示protected Callable<Boolean> isProcessed() {&nbsp; &nbsp; &nbsp; &nbsp; return () -> {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return singletonObj.getCacheCount()==2;&nbsp; &nbsp; &nbsp; &nbsp; };&nbsp; &nbsp; }