如何使用MockRestServiceServer模拟RestTemplate? [英] How to mock RestTemplate with MockRestServiceServer?

问题描述

@RunWith(MockitoJUnitRunner.class)
public class FeatureFlipperManagerTest {
    @Autowired
    RestTemplate restTemplate = new RestTemplate();
    @Autowired
    Service service = new Service();
    MockRestServiceServer mockServer = MockRestServiceServer.createServer(restTemplate);

    @Test
    public void test() throws Exception {
      mockServer.expect(requestTo(Mockito.anyString()))
                .andRespond(withSuccess("{\"enabled\":true}", MediaType.APPLICATION_JSON));
        boolean res = service.isEnabled("xxx");
        mockServer.verify();
        Assert.assertEquals(true, res);
    }
}

我有MockRestServiceServer来模拟服务中的restTemplete.但是它总是失败.它显示错误为java.lang.AssertionError: Further request(s) expected 0 out of 1 were executed.任何人都可以让我知道我做错了什么地方.

I have MockRestServiceServer to mock restTemplete in a service. But it always fail. it shows the error as java.lang.AssertionError: Further request(s) expected 0 out of 1 were executed. Any one could let me know where I did not do it right.

服务本身将如下所示:

public class Service{
    public boolean isEnabled(String xxx) {
        RestTemplate restTemplate = new RestTemplate();
        ResponseEntity<String> response = restTemplate.getForEntity("someurl",String.class);
        if(...)return true;
        return false;
    }
}

推荐答案

首先，您的Service类在每个请求上创建一个RestTemplate的新实例.我不能足够强调这种不良做法.创建一个类型为RestTemplate的bean，并将其注入到您的Service bean中(很可能已经创建-取决于您使用的Spring MVC版本).

First of all, your Service class creates a new instance of RestTemplate on every request. I cannot stress enough how bad practice it is. Create a bean of type RestTemplate and inject it into your Service bean (it is most likely already created - depending on the Spring MVC version you are using).

一旦有了它，那么这两个RestTemplates:一个在Service bean中，另一个在FeatureFlipperManagerTest中注入，并且可以用MockRestServiceServer进行测试.

Once you have it, then both RestTemplates: one in your Service bean and one injected into FeatureFlipperManagerTest will be the same and testing with MockRestServiceServer will be possible.

编辑-更明确地说:

将您的Service类修改为:

@Component
public class Service {

    private RestTemplate restTemplate;  

    @Autowired 
    public Service(RestTemplate restTemplate) {
        this.restTemplate = restTemplate;
    }

    public boolean isEnabled(String xxx) {
        ResponseEntity<String> response = restTemplate.getForEntity("someurl",String.class);
        if(...)return true;
        return false;
    }
}

和您的测试班级:

@RunWith(MockitoJUnitRunner.class)
public class FeatureFlipperManagerTest {
    @Autowired
    RestTemplate restTemplate;

    @Autowired
    Service service;

    MockRestServiceServer mockServer = MockRestServiceServer.createServer(restTemplate);

    @Test
    public void test() throws Exception {
      mockServer.expect(requestTo(Mockito.anyString()))
                .andRespond(withSuccess("{\"enabled\":true}", MediaType.APPLICATION_JSON));
        boolean res = service.isEnabled("xxx");
        mockServer.verify();
        Assert.assertEquals(true, res);
    }
}

如果此操作失败，并指出没有RestTemplate bean，则请粘贴有关您正在使用的Spring版本的信息(Spring Boot?).

If this fails with exception saying that there is no RestTemplate bean present then please paste info about version of Spring (Spring Boot?) you are using.

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