spring - 使用 Hystrix Spring Cloud 进行单元测试回退的任何样本

Question

我想测试以下场景：

1. 将该hystrix.command.default.execution.isolation.thread.timeoutInMillisecond值设置为较低的值，然后查看我的应用程序的行为。
2. 检查我的后备方法是使用单元测试调用的。

请有人给我提供样品的链接。

Answer 1

一个真正的用法可以在下面找到。在测试类中启用 Hystrix 的关键是这两个注解：@EnableCircuitBreaker @EnableAspectJAutoProxy

class ClipboardService {

    @HystrixCommand(fallbackMethod = "getNextClipboardFallback")
    public Task getNextClipboard(int numberOfTasks) {
        doYourExternalSystemCallHere....
    }

    public Task getNextClipboardFallback(int numberOfTasks) {
        return null;
    }
}


@RunWith(SpringRunner.class)
@EnableCircuitBreaker
@EnableAspectJAutoProxy
@TestPropertySource("classpath:test.properties")
@ContextConfiguration(classes = {ClipboardService.class})
public class ClipboardServiceIT {

    private MockRestServiceServer mockServer;

    @Autowired
    private ClipboardService clipboardService;

    @Before
    public void setUp() {
        this.mockServer = MockRestServiceServer.createServer(restTemplate);
    }

    @Test
    public void testGetNextClipboardWithBadRequest() {
        mockServer.expect(ExpectedCount.once(), requestTo("https://getDocument.com?task=1")).andExpect(method(HttpMethod.GET))
        .andRespond(MockRestResponseCreators.withStatus(HttpStatus.BAD_REQUEST));
        Task nextClipboard = clipboardService.getNextClipboard(1);
            assertNull(nextClipboard); // this should be answered by your fallBack method
        }
    }

Answer 2

在你打电话给客户之前，在你的单元测试用例中打开电路。确保调用 fall back。您可以从后备中返回一个常量或添加一些日志语句。重置电路。

@Test
public void testSendOrder_openCircuit() {
    String order = null;
    ServiceResponse response = null;

    order = loadFile("/order.json");
    // use this in case of feign hystrix
    ConfigurationManager.getConfigInstance()
            .setProperty("hystrix.command.default.circuitBreaker.forceOpen", "true");
   // use this in case of just hystrix
   System.setProperty("hystrix.command.default.circuitBreaker.forceOpen", "true");

    response = client.sendOrder(order);

    assertThat(response.getResultStatus()).isEqualTo("Fallback");
    // DONT forget to reset
    ConfigurationManager.getConfigInstance()
            .setProperty("hystrix.command.default.circuitBreaker.forceOpen", "false");
    // use this in case of just hystrix
    System.setProperty("hystrix.command.default.circuitBreaker.forceOpen", "false");

}