Модульный тест для Websocket возвращает NULL

Question

Я пытаюсь реализовать модульный тест для Websocket в Springboot с JUnit.

Я следую по этой ссылке, и она работает нормально, но получает null в результат, когда я тестирую свой веб-сокет в браузере, он отправляет желаемые результаты.

позвольте мне показать мой тестовый класс

@ExtendWith(SpringExtension.class)
@SpringBootTest(classes =Main.class)
@WebAppConfiguration
public class WebSocketTest {

static final String WEBSOCKET_URI = "http://localhost:8080/api/realtimedata";
static final String WEBSOCKET_TOPIC = "/realtimedata";

BlockingQueue<WebSocketData> blockingQueue;
WebSocketStompClient stompClient;

@BeforeEach
public void setup() {

    blockingQueue = new LinkedBlockingDeque<>();
    stompClient = new WebSocketStompClient(new SockJsClient(
            asList(new WebSocketTransport(new StandardWebSocketClient()))));
}

@Test
public void shouldReceiveAMessageFromTheServer() throws Exception {
    StompSession session = stompClient
            .connect(WEBSOCKET_URI, new StompSessionHandlerAdapter() {})
            .get(1, SECONDS);
    session.subscribe(WEBSOCKET_TOPIC, new DefaultStompFrameHandler());

    String message = "{\"groupId\":\"grp-1\", \"accountId\":\"acc-1\", \"userId\":\"usr-1\"}";
    session.send(WEBSOCKET_TOPIC, message.getBytes()); 
    Assertions.assertEquals("trying to figureout", blockingQueue.poll(1, SECONDS));
}

class DefaultStompFrameHandler implements StompFrameHandler {
    @Override
    public Type getPayloadType(StompHeaders stompHeaders) {
        return WebSocketData.class;
    }

    @Override
    public void handleFrame(StompHeaders stompHeaders, Object o) {
        blockingQueue.offer((WebSocketData) o);
    }
}

}

Вот мой WebSocketConfiguration class

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfiguration implements WebSocketMessageBrokerConfigurer {

@Override
public void configureMessageBroker(MessageBrokerRegistry registry) {
    registry.enableSimpleBroker("/realtimedata");
    registry.setApplicationDestinationPrefixes("/wsconn");
}

@Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
    registry.addEndpoint("/realtimedata")
            .setAllowedOrigins("*")
            .withSockJS();
}

}

Это ответ, который я получаю от сервера

org.opentest4j.AssertionFailedError: 
Expected :trying to figureout
Actual   :null

Обновление:

После добавления изменения, рекомендованные Rieckpil в ответе ниже, и с некоторыми дальнейшими исследованиями мой тестовый класс теперь выглядит следующим образом

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class ServerWebSocketTest {

@LocalServerPort
private Integer port;

static final String WEBSOCKET_TOPIC = "/realtimedata";

BlockingQueue<WebSocketData> blockingQueue;
WebSocketStompClient stompClient;

@BeforeEach
public void setup() {

    blockingQueue = new LinkedBlockingDeque<>();
    stompClient = new WebSocketStompClient(new SockJsClient(
            asList(new WebSocketTransport(new StandardWebSocketClient()))));

    // might be required
    stompClient.setMessageConverter(new MappingJackson2MessageConverter());

}

@Test
public void shouldReceiveAMessageFromTheServer() throws Exception {
    StompSession session = stompClient
            .connect(getWsPath(), **new DefaultStompFrameHandler()** {
            })
            .get(1, TimeUnit.SECONDS);
    session.subscribe(WEBSOCKET_TOPIC, new DefaultStompFrameHandler());

    String message = "{\"groupId\":\"grp-1\", \"accountId\":\"acc-1\", \"userId\":\"usr-1\"}";
    session.send(WEBSOCKET_TOPIC, message.getBytes());
    Assertions.assertEquals("trying to figureout", blockingQueue.poll(1, TimeUnit.SECONDS));
}

class DefaultStompFrameHandler **extends StompSessionHandlerAdapter**{   
    @Override
    public Type getPayloadType(StompHeaders stompHeaders) {
        return WebSocketData.class;
    }

    @Override
    public void handleFrame(StompHeaders stompHeaders, Object o) {
        blockingQueue.offer((WebSocketData) o);
    }

    **@Override
    public void handleException(StompSession session, StompCommand command, StompHeaders headers, byte[] payload, Throwable exception) {
        exception.printStackTrace();
    }**
}
private String getWsPath() {
    return String.format("ws://localhost:%d/location_services/realtimedata", port);
}

}

После этих изменений я теперь могу получить трассировку стека для печати в журналах

вот исключение, которое я получил после этих изменений

 org.springframework.messaging.converter.MessageConversionException: Could not read JSON: Cannot construct instance of `com.convo.locationservices.websocket.WebSocketData` (although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value ('eyJncm91cElkIjoiZ3JwLTEiLCAiYWNjb3VudElkIjoiYWNjLTEiLCAidXNlcklkIjoidXNyLTEifQ==')
 at [Source: (byte[])""eyJncm91cElkIjoiZ3JwLTEiLCAiYWNjb3VudElkIjoiYWNjLTEiLCAidXNlcklkIjoidXNyLTEifQ==""; line: 1, column: 1]; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `com.convo.locationservices.websocket.WebSocketData` (although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value ('eyJncm91cElkIjoiZ3JwLTEiLCAiYWNjb3VudElkIjoiYWNjLTEiLCAidXNlcklkIjoidXNyLTEifQ==')
 at [Source: (byte[])""eyJncm91cElkIjoiZ3JwLTEiLCAiYWNjb3VudElkIjoiYWNjLTEiLCAidXNlcklkIjoidXNyLTEifQ==""; line: 1, column: 1], failedMessage=GenericMessage [payload=byte[82], headers={simpMessageType=MESSAGE, stompCommand=MESSAGE, nativeHeaders={destination=[/realtimedata], content-type=[application/json], subscription=[0], message-id=[cc55448f0b4f447d8f6bc7662acd15db-0], content-length=[82]}, simpSubscriptionId=0, contentType=application/json, simpSessionId=2df73ca0-e13b-c479-4591-37e9f7e8d689, simpDestination=/realtimedata}]
    at org.springframework.messaging.converter.MappingJackson2MessageConverter.convertFromInternal(MappingJackson2MessageConverter.java:235)
    at org.springframework.messaging.converter.AbstractMessageConverter.fromMessage(AbstractMessageConverter.java:197)
    at org.springframework.messaging.converter.AbstractMessageConverter.fromMessage(AbstractMessageConverter.java:188)
    at org.springframework.messaging.simp.stomp.DefaultStompSession.invokeHandler(DefaultStompSession.java:477)
    at org.springframework.messaging.simp.stomp.DefaultStompSession.handleMessage(DefaultStompSession.java:429)
    at org.springframework.web.socket.messaging.WebSocketStompClient$WebSocketTcpConnectionHandlerAdapter.handleMessage(WebSocketStompClient.java:340)
    at org.springframework.web.socket.handler.WebSocketHandlerDecorator.handleMessage(WebSocketHandlerDecorator.java:75)
    at org.springframework.web.socket.handler.LoggingWebSocketHandlerDecorator.handleMessage(LoggingWebSocketHandlerDecorator.java:56)
    at org.springframework.web.socket.sockjs.client.AbstractClientSockJsSession.handleMessageFrame(AbstractClientSockJsSession.java:294)
    at org.springframework.web.socket.sockjs.client.AbstractClientSockJsSession.handleFrame(AbstractClientSockJsSession.java:230)
    at org.springframework.web.socket.sockjs.client.WebSocketTransport$ClientSockJsWebSocketHandler.handleTextMessage(WebSocketTransport.java:163)
    at org.springframework.web.socket.handler.AbstractWebSocketHandler.handleMessage(AbstractWebSocketHandler.java:43)
    at org.springframework.web.socket.adapter.standard.StandardWebSocketHandlerAdapter.handleTextMessage(StandardWebSocketHandlerAdapter.java:114)
    at org.springframework.web.socket.adapter.standard.StandardWebSocketHandlerAdapter.access$000(StandardWebSocketHandlerAdapter.java:43)
    at org.springframework.web.socket.adapter.standard.StandardWebSocketHandlerAdapter$3.onMessage(StandardWebSocketHandlerAdapter.java:85)
    at org.springframework.web.socket.adapter.standard.StandardWebSocketHandlerAdapter$3.onMessage(StandardWebSocketHandlerAdapter.java:82)
    at org.apache.tomcat.websocket.WsFrameBase.sendMessageText(WsFrameBase.java:395)
    at org.apache.tomcat.websocket.WsFrameBase.processDataText(WsFrameBase.java:495)
    at org.apache.tomcat.websocket.WsFrameBase.processData(WsFrameBase.java:294)
    at org.apache.tomcat.websocket.WsFrameBase.processInputBuffer(WsFrameBase.java:133)
    at org.apache.tomcat.websocket.WsFrameClient.processSocketRead(WsFrameClient.java:95)
    at org.apache.tomcat.websocket.WsFrameClient.resumeProcessing(WsFrameClient.java:209)
    at org.apache.tomcat.websocket.WsFrameClient.access$300(WsFrameClient.java:31)
    at org.apache.tomcat.websocket.WsFrameClient$WsFrameClientCompletionHandler.doResumeProcessing(WsFrameClient.java:186)
    at org.apache.tomcat.websocket.WsFrameClient$WsFrameClientCompletionHandler.completed(WsFrameClient.java:163)
    at org.apache.tomcat.websocket.WsFrameClient$WsFrameClientCompletionHandler.completed(WsFrameClient.java:148)
    at java.base/sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:127)
    at java.base/sun.nio.ch.Invoker$2.run(Invoker.java:219)
    at java.base/sun.nio.ch.AsynchronousChannelGroupImpl$1.run(AsynchronousChannelGroupImpl.java:112)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `com.convo.locationservices.websocket.WebSocketData` (although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value ('eyJncm91cElkIjoiZ3JwLTEiLCAiYWNjb3VudElkIjoiYWNjLTEiLCAidXNlcklkIjoidXNyLTEifQ==')
 at [Source: (byte[])""eyJncm91cElkIjoiZ3JwLTEiLCAiYWNjb3VudElkIjoiYWNjLTEiLCAidXNlcklkIjoidXNyLTEifQ==""; line: 1, column: 1]
    at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:63)
    at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1432)
    at com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1062)
    at com.fasterxml.jackson.databind.deser.ValueInstantiator._createFromStringFallbacks(ValueInstantiator.java:371)
    at com.fasterxml.jackson.databind.deser.std.StdValueInstantiator.createFromString(StdValueInstantiator.java:323)
    at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromString(BeanDeserializerBase.java:1373)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeOther(BeanDeserializer.java:171)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:161)
    at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4218)
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3309)
    at org.springframework.messaging.converter.MappingJackson2MessageConverter.convertFromInternal(MappingJackson2MessageConverter.java:219)
    ... 31 more
            

org.opentest4j.AssertionFailedError: 
Expected :trying to figureout
Actual   :null
 

Может ли кто-нибудь подсказать мне, что я делаю не так?

Спасибо.

Answer 1

Вы должны сконфигурировать свой интеграционный тест для использования запущенного контекста Spring и без жесткого кодирования 8080.

Более того, убедитесь, что MessageConverter настроен для вашего WebSocketStompClient, который соответствует вашему варианту использования. . По умолчанию SimpleMessageConverter. Когда вы отправляете byte[], ByteArrayMessageConverter должен соответствовать.

Ваш тест может быть реорганизован на следующее:

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class Test {

  @LocalServerPort
  private Integer port;
  
  static final String WEBSOCKET_TOPIC = "/realtimedata";

  BlockingQueue<WebSocketData> blockingQueue;
  WebSocketStompClient stompClient;

  @BeforeEach
  public void setup() {

    blockingQueue = new LinkedBlockingDeque<>();
    stompClient = new WebSocketStompClient(new SockJsClient(
      asList(new WebSocketTransport(new StandardWebSocketClient()))));

    webSocketStompClient.setMessageConverter(new ByteArrayMessageConverter()); 

  }

  @Test
  public void shouldReceiveAMessageFromTheServer() throws Exception {
    StompSession session = stompClient
      .connect(getWsPath(), new StompSessionHandlerAdapter() {
      })
      .get(1, SECONDS);
    session.subscribe(WEBSOCKET_TOPIC, new DefaultStompFrameHandler());

    String message = "{\"groupId\":\"grp-1\", \"accountId\":\"acc-1\", \"userId\":\"usr-1\"}";
    session.send(WEBSOCKET_TOPIC, message.getBytes());
    Assertions.assertEquals("trying to figureout", blockingQueue.poll(1, SECONDS));
  }

  class DefaultStompFrameHandler implements StompFrameHandler {
    @Override
    public Type getPayloadType(StompHeaders stompHeaders) {
      return WebSocketData.class;
    }

    @Override
    public void handleFrame(StompHeaders stompHeaders, Object o) {
      blockingQueue.offer((WebSocketData) o);
    }
  }
  
  private String getWsPath() {
    return String.format("ws://localhost:%d/api/realtimedata", port);
  }

}

Этот тест запустит весь контекст Spring, встроенный контейнер сервлета на случайном порту и попробуйте подключиться к вашей конечной точке.