如何使用spring-cloud-netflix和feign编写集成测试 [英] How to write integration tests with spring-cloud-netflix and feign

问题描述

我使用Spring-Cloud-Netflix在微服务之间进行通信.假设我有两个服务，即Foo和Bar，而Foo使用了Bar的REST端点之一.我使用带有@FeignClient注释的接口:

I use Spring-Cloud-Netflix for communication between micro services. Let's say I have two services, Foo and Bar, and Foo consumes one of Bar's REST endpoints. I use an interface annotated with @FeignClient:

@FeignClient
public interface BarClient {
  @RequestMapping(value = "/some/url", method = "POST")
  void bazzle(@RequestBody BazzleRequest);
}

然后我在Foo中有一个服务类SomeService，它调用了BarClient.

Then I have a service class SomeService in Foo, which calls the BarClient.

@Component
public class SomeService {
    @Autowired
    BarClient barClient;

    public String doSomething() {
      try {
        barClient.bazzle(new BazzleRequest(...));
        return "so bazzle my eyes dazzle";
      } catch(FeignException e) {
        return "Not bazzle today!";
      }

    }
}

现在，为了确保服务之间的通信正常，我想构建一个测试，该测试使用WireMock之类的东西向伪造的Bar服务器触发真实的HTTP请求.测试应确保伪装正确解码服务响应并将其报告给SomeService.

Now, to make sure the communication between services works, I want to build a test that fires a real HTTP request against a fake Bar server, using something like WireMock. The test should make sure that feign correctly decodes the service response and reports it to SomeService.

public class SomeServiceIntegrationTest {

    @Autowired SomeService someService;

    @Test
    public void shouldSucceed() {
      stubFor(get(urlEqualTo("/some/url"))
        .willReturn(aResponse()
            .withStatus(204);

      String result = someService.doSomething();

      assertThat(result, is("so bazzle my eyes dazzle"));
    }

    @Test
    public void shouldFail() {
      stubFor(get(urlEqualTo("/some/url"))
        .willReturn(aResponse()
            .withStatus(404);

      String result = someService.doSomething();

      assertThat(result, is("Not bazzle today!"));
    }
}

如何将这样的WireMock服务器注入到eureka中，这样假装就能找到它并与之通信?我需要哪种注释魔术?

How can I inject such a WireMock server into eureka, so that feign is able to find it and communicate with it? What kind of annotation magic do I need?

推荐答案

使用Spring的RestTemplate代替伪装. RestTemplate还能够通过eureka解析服务名称，因此您可以执行以下操作:

Use Spring's RestTemplate instead of feign. RestTemplate is also able to resolve service names via eureka, so you can do something like this:

@Component
public class SomeService {
   @Autowired
   RestTemplate restTemplate;

   public String doSomething() {
     try {
       restTemplate.postForEntity("http://my-service/some/url", 
                                  new BazzleRequest(...), 
                                  Void.class);
       return "so bazzle my eyes dazzle";
     } catch(HttpStatusCodeException e) {
       return "Not bazzle today!";
     }
   }
}

使用Wiremock进行测试比伪装更容易.

This is way easier testable with Wiremock than feign.

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