如何断言 Rest Client 异常？

Question

我正在尝试断言其余客户端异常。我的一段代码如下：

public class SomeClass {

    public SomeResponse postMessage() {
        SomeBean requestObject = new SomeBean();
        SomeResponse response = null;
        try{
            response =  restTemaple.postForEntity("http://someUrl", requestObject, SomeResponse.class);
        } catch(RestTemplateException e) {
            Sysout("Rest Template Exception!");
        }

        return response;
    }

}

我的测试用例如下：

@RunWith(MockitoJUnitRunner.class)
@ActiveProfiles("test")
@PropertySource("classpath:application-test.properties")
public class testClass {

    @InjectMocks
    SomeClass service;

    @Mock
    RestTempalte restTemplate;

    @Test (expected = RestTemplateException.class)
    public void myTest() {
        Mockito.when(
                restTemplate.postForEntity(Mockito.anyString(), Mockito.any(SomeBean.class), Mockito.any()))
                .thenThrow(new RestClientException(null));

        service.postMessage();
        }

}

我收到一个 Junit 断言错误。请在下面找到 stackTrace：

java.lang.AssertionError: Expected exception: org.springframework.web.client.RestClientException
    at org.junit.internal.runners.statements.ExpectException.evaluate(ExpectException.java:32)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.mockito.internal.runners.DefaultInternalRunner$1.run(DefaultInternalRunner.java:79)
    at org.mockito.internal.runners.DefaultInternalRunner.run(DefaultInternalRunner.java:85)
    at org.mockito.internal.runners.StrictRunner.run(StrictRunner.java:39)
    at org.mockito.junit.MockitoJUnitRunner.run(MockitoJUnitRunner.java:163)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

请告诉我。我如何在这里抛出和断言其余客户端异常？

Answer 1

您将异常捕获到postMessage 中，而无需重新抛出异常。如果将异常处理到postMessage，则不必测试方法执行是否会抛出 RestClientException ，因为它已在此处处理。如果您等待您的方法抛出此异常，请不要捕获它，只需在方法声明中使用 throws RestClientException

public class SomeClass {

    public void postMessage() throws RestClientException {
        SomeBean requestObject = new SomeBean();
        return restTemaple.postForEntity("http://someUrl", requestObject, SomeResponse.class);
    }

}

那么你不要在你的单元测试中调用postMessage。您只是在向您的模拟提供有关在调用 RestTempalte.postForEntity 时如何做出反应的说明。

    @Test (expected = RestClientException.class)
        public void myTest() {
            Mockito.when(
                    restTemplate.postForEntity(Mockito.anyString(), Mockito.any(SomeBean.class), Mockito.any()))
                    .thenThrow(new RestClientException(null));

            service.postMessage(); // something like that needed here
        }

你在postMessage中返回一些东西也很奇怪，因为方法的返回类型是void

public SomeResponse postMessage() throws RestClientException {
    SomeBean requestObject = new SomeBean();
    return restTemaple.postForEntity("http://someUrl", requestObject, SomeResponse.class);
}

更好看