Spring Boot + Cloud | Zuul Proxy | Integration testing

The accepted answer has the main idea. But I struggle on some points until figure out the problem. So I would like to show a more complete answer using also Wiremock.

The test:

@ActiveProfiles("test")
@TestPropertySource(locations = "classpath:/application-test.yml")
@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
@AutoConfigureWireMock(port = 5001)
public class ZuulRoutesTest {

    @LocalServerPort
    private int port;

    private TestRestTemplate restTemplate = new TestRestTemplate();

    @Before
    public void before() {

        stubFor(get(urlPathEqualTo("/1/orders/")).willReturn(aResponse()
                .withHeader("Content-Type", MediaType.TEXT_HTML_VALUE)
                .withStatus(HttpStatus.OK.value())));
    }

    @Test
    public void urlOrders() {
        ResponseEntity<String> result = this.restTemplate.getForEntity("http://localhost:"+this.port +"/api/orders/", String.class);
        assertEquals(HttpStatus.OK, result.getStatusCode());

        verify(1, getRequestedFor(urlPathMatching("/1/.*")));
    }
}

And the application-test.yml:

zuul:
  prefix: /api
  routes:
    orders:
      url: http://localhost:5001/1/
    cards:
      url: http://localhost:5001/2/

This should work.

But Wiremock has some limitations for me. If you has proxy requests with different hostnames running on different ports, like this:

zuul:
  prefix: /api
  routes:
    orders:
      url: http://lp-order-service:5001/
    cards:
      url: http://lp-card-service:5002/

A localhost Wiremock running on the same port will no be able to help you. I'm still trying to find a similar Integration Test where I could just mock a Bean from Spring and read what url the Zuul Proxy choose to route before it make the request call.

Check out WireMock. I have been using it to do integration level testing of my Spring Cloud Zuul project.

import static com.github.tomakehurst.wiremock.client.WireMock.*;

public class TestClass {
    @Rule
    public WireMockRule serviceA = new WireMockRule(WireMockConfiguration.options().dynamicPort());

    @Before
    public void before() {
        serviceA.stubFor(get(urlPathEqualTo("/test-path/test")).willReturn(aResponse()
            .withHeader("Content-Type", "application/json").withStatus(200).withBody("serviceA:test-path")));
    }

    @Test
    public void testRoute() {
        ResponseEntity<String> responseEntity = this.restTemplate.getForEntity("/test-path/test", String.class);
        assertThat(responseEntity.getStatusCode()).isEqualTo(HttpStatus.OK);

        serviceA.verify(1, getRequestedFor(urlPathEqualTo("/test-path/test")));
    }
}