[英]Using ParameterizedTypeReference to setExpectedResponseType for HttpRequestExecutingMessageHandler
[英]Testing HttpRequestExecutingMessageHandler using MockRestServiceServer
我正在使用Spring Integration開發一個應用程序,該應用程序使用HttpRequestExecutingMessageHandler
類定期向REST服務發出后端請求。 我想在測試中模擬出REST服務器,而不是構建一個模擬服務器,我寧願使用MockRestServiceServer
來做這件事。 但是, MockRestServiceServer
似乎沒有攔截RestTemplate
調用,而是通過(到http://example.com/
)並引發java.net.ConnectException: Connection refused
。 有沒有辦法強制HttpRequestExecutingMessageHandler
調用MockRestServiceServer
,還是應該重新考慮這個測試策略?
應用程序的配置:
@Configuration
public class RestClientTestApplicationConfig {
@Bean
@Qualifier("httpRequestChannel")
public MessageChannel httpRequestChannel() { return new QueueChannel(); }
@Bean
@Qualifier("httpReplyChannel")
public MessageChannel httpReplyChannel() { return new QueueChannel(); }
@Bean
public RestTemplate restTemplate() { return new RestTemplate(); }
@Bean
@InboundChannelAdapter(value="httpRequestChannel", poller=@Poller(fixedDelay = "1000"))
public MessageSource<String> httpRequestTrigger() { return new ExpressionEvaluatingMessageSource<>(new LiteralExpression(""), String.class); }
@Bean
@ServiceActivator(inputChannel="httpRequestChannel", poller=@Poller(fixedDelay = "1000"))
public MessageHandler messageHandler(
RestTemplate restTemplate,
@Qualifier("httpReplyChannel") MessageChannel messageChannel,
@Value("${url}") String url
) {
HttpRequestExecutingMessageHandler messageHandler = new HttpRequestExecutingMessageHandler(url, restTemplate);
messageHandler.setOutputChannel(messageChannel);
return messageHandler;
}
}
( url
在application-test.properties
定義為測試中的http://example.com
,否則為真實URL)
測試:
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest
public class RestClientIntegrationTest {
@Autowired
private RestTemplate restTemplate;
private MockRestServiceServer mockServer;
@Before
public void setup() {
mockServer = MockRestServiceServer.createServer(restTemplate);
}
@Test
public void makesBackendRequest() {
mockServer.expect(ExpectedCount.once(), MockRestRequestMatchers.requestTo("http://example.com/"))
.andExpect(MockRestRequestMatchers.method(HttpMethod.GET));
mockServer.verify();
}
}
檢測結果:
2016-12-29 16:14:36.902 ERROR 16665 --- [ask-scheduler-2] o.s.integration.handler.LoggingHandler : org.springframework.messaging.MessageHandlingException: HTTP request execution failed for URI [http://example.com]; nested exception is org.springframework.web.client.ResourceAccessException: I/O error on POST request for "http://example.com": Connection refused (Connection refused); nested exception is java.net.ConnectException: Connection refused (Connection refused)
at org.springframework.integration.http.outbound.HttpRequestExecutingMessageHandler.handleRequestMessage(HttpRequestExecutingMessageHandler.java:409)
java.lang.AssertionError: Further request(s) expected leaving 1 unsatisfied expectation(s).
0 request(s) executed.
at org.springframework.test.web.client.AbstractRequestExpectationManager.verify(AbstractRequestExpectationManager.java:103)
at org.springframework.test.web.client.MockRestServiceServer.verify(MockRestServiceServer.java:117)
at com.restclienttest.RestClientIntegrationTest.makesBackendRequest(RestClientIntegrationTest.java:35)
更新根據Artem Bilan的評論改編測試代碼如下:
mockServer.expect(ExpectedCount.once(), MockRestRequestMatchers.requestTo("http://example.com/"))
.andExpect(MockRestRequestMatchers.method(HttpMethod.GET))
.andRespond(MockRestResponseCreators.withSuccess("example reply", MediaType.TEXT_PLAIN));
Message<?> message = httpReplyChannel.receive(1001);
assertNotNull(message);
assertThat(((ResponseEntity<String>) message.getPayload()).getBody(), is("example reply"));
仍然獲得ConnectException
和MockRestServiceServer
發送的示例回復似乎沒有通過,因為ResponseEntity
的主體為null。
我覺得你在這里很好。 只有您錯過了應用程序異步的問題 。 所述@InboundChannelAdapter
周期性地發送消息到QueueChannel
等。 但是它在poller的主題中就是這樣,而不是你在等待驗證的那個。
作為修復,我認為您應該通過其httpReplyChannel
.receive(10000)
方法等待httpReplyChannel
回復。 然后才調用mockServer.verify()
。
UPDATE
嗯。 我說我們已經有了一個測試用例:
<bean id="restTemplate" class="org.springframework.web.client.RestTemplate"/>
<int-http:outbound-gateway url="/testApps/httpMethod"
request-channel="requestChannel"
reply-channel="replyChannel"
rest-template="restTemplate"
expected-response-type="java.lang.String"
http-method-expression="payload"/>
<int:channel id="replyChannel">
<int:queue/>
</int:channel>
@Autowired
private RestTemplate restTemplate;
private MockRestServiceServer mockServer;
@Before
public void setup() {
this.mockServer = MockRestServiceServer.createServer(this.restTemplate);
}
@Test
public void testDefaultMethod() throws Exception {
this.mockServer.expect(requestTo("/testApps/httpMethod"))
.andExpect(method(HttpMethod.POST))
.andRespond(withSuccess(HttpMethod.POST.name(), MediaType.TEXT_PLAIN));
this.defaultChannel.send(new GenericMessage<String>("Hello"));
Message<?> message = this.replyChannel.receive(5000);
assertNotNull(message);
assertEquals("POST", message.getPayload());
this.mockServer.verify();
}
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