如何在JUnit测试中将MockWebServer端口设置为WebClient?

问题描述

我正在将spring-boot与WebClient一起使用，并且将其自动装配为bean.

I'm using spring-boot with WebClient, which is autowired as a bean.

问题:编写junit集成测试时，我必须使用okhttp MockWebServer.该模拟总是在随机端口(例如localhost:14321)上启动.

Problem: when writing a junit integration test, I have to use okhttp MockWebServer. This mock always starts up on a random port, eg localhost:14321.

现在我的WebClient当然有一个固定的URL，它将请求发送到该URL.该网址可能由application.properties参数(例如webclient.url=https://my.domain.com/)给出，因此我可以在junit测试中覆盖该字段.但是只是静态的.

Now my WebClient of course has a fixed url that it sends the requests to. This url may be given by an application.properties parameter like webclient.url=https://my.domain.com/, so I could override that field in a junit test. But only statically.

问题:如何重置@SpringBootTest中的WebClient bean，以便它始终将请求发送到我的模拟服务器?

Question: how can I reset the WebClient bean inside a @SpringBootTest so that it sends the requests always to my mock server?

@Service
public class WebClientService {
     public WebClientService(WebClient.Builder builder, @Value("${webclient.url}" String url) {
          this.webClient = builder.baseUrl(url)...build();
     }

     public Response send() {
          return webClient.body().exchange().bodyToMono();
     }
}

@Service
public void CallingService {
      @Autowired
      private WebClientService service;

      public void call() {
           service.send();
      }
}


@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class MyWebTest {
        @Autowired
        private CallingService calling;

        @Test
        public void test() {
             MockWebServer mockWebServer = new MockWebServer();
             System.out.println("Current mock server url: " + mockWebServer.url("/").toString()); //this is random

             mockWebServer.enqueue(new MockResponse()....);

             //TODO how to make the mocked server url public to the WebClient?
             calling.call();
        }
}

如您所见，我正在编写一个完整的真实世界junit集成测试.唯一的问题是:如何将MockWebServer网址和端口传递给WebClient，以便它自动将请求发送到我的模拟计算机?

As you see, I'm writing a full realworld junit integration test. The only problem is: how can I pass the MockWebServer url and port to the WebClient so that it automatically sends the requests to my mock??

旁注:我肯定在这里MockWebServer中需要一个随机端口，以免干扰其他正在运行的测试或应用程序.因此，必须坚持使用随机端口，并找到一种方法将其传递给webclient(或动态覆盖应用程序属性).

Sidenote: I definitely need a random port in MockWebServer here to not interfer with other running tests or applications. Thus have to stick to the random port, and find a way to pass it to the webclient (or dynamically override the application property).

更新:我想出了以下可行的方法.但是也许有人知道如何使模拟服务器字段非静态?

Update:I came up with the following, which works. But maybe anyone knows how to make the mockserver field non-static?

@ContextConfiguration(initializers = RandomPortInitializer.class)
public abstract class AbstractITest {
    @ClassRule
    public static final MockWebServer mockWebServer = new MockWebServer();

    public static class RandomPortInitializer implements ApplicationContextInitializer<ConfigurableApplicationContext> {
        @Override
        public void initialize(ConfigurableApplicationContext applicationContext) {
            TestPropertySourceUtils.addInlinedPropertiesToEnvironment(applicationContext,
                    "webclient.url=" + mockWebServer.url("/").toString());
        }
    }
}

推荐答案

您可以使用setField(Object targetObject, String name, Object value) /org/springframework/test/util/ReflectionTestUtils.html"rel =" nofollow noreferrer> ReflectionTestUtils .

You can use the method setField(Object targetObject, String name, Object value) from ReflectionTestUtils.

    @Test
    public void test() {
         MockWebServer mockWebServer = new MockWebServer();
         System.out.println("Current mock server url: " + mockWebServer.url("/").toString()); //this is random

         mockWebServer.enqueue(new MockResponse()....);

         WebClientService newWebClientService = new WebClientService(WebClient.builder(), mockWebServer.url("/").toString());
         ReflectionTestUtils.setField(calling, "service", newWebClientService);

         calling.call();
    }

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