Testing Server Sent Event With Rest Assured Framework - spring-boot

Question

I am using spring boot and rest assured to test my REST services
I have a rest controller, such as
#GetMapping(produces = MediaType.TEXT_EVENT_STREAM_VALUE)
Flux<String> getFlux() {
...
How do I assert on the response body correctly?
I think the value comes back as "data: " for a stream that terminates after one output.
I also have no idea how to test a stream actual works when trying to affect the data asynchronously?

Answer 1

Reactive Testing
You should use WebTestClient to test your reactive services.
Here is an example
The service method:
public Flux<GithubRepo> listGithubRepositories(String username, String token) {
return webClient.get()
.uri("/user/repos")
.header("Authorization", "Basic " + Base64Utils
.encodeToString((username + ":" + token).getBytes(UTF_8)))
.retrieve()
.bodyToFlux(GithubRepo.class);
}
The Test:
#RunWith(SpringRunner.class)
#SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class WebclientDemoApplicationTests {
#Autowired
private WebTestClient webTestClient;
#Test
public void test2GetAllGithubRepositories() {
webTestClient.get().uri("/api/repos")
.accept(MediaType.APPLICATION_JSON_UTF8)
.exchange()
.expectStatus().isOk()
.expectHeader().contentType(MediaType.APPLICATION_JSON_UTF8)
.expectBodyList(GithubRepo.class);
}
}
Please find the examples here https://www.callicoder.com/spring-5-reactive-webclient-webtestclient-examples/
Standard MVC Testing
MockMVC
You could use a mock environment where the controller classes are tested without really launching a servlet container:
#RunWith(SpringRunner.class)
#SpringBootTest
#AutoConfigureMockMvc
public class MockMvcExampleTests {
#Autowired
private MockMvc mvc;
#Test
public void exampleTest() throws Exception {
this.mvc.perform(get("/")).andExpect(status().isOk())
.andExpect(content().string("Hello World"));
}
}
With a running server:
#RunWith(SpringRunner.class)
#SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
public class RandomPortTestRestTemplateExampleTests {
#Autowired
private TestRestTemplate restTemplate;
#Test
public void exampleTest() {
String body = this.restTemplate.getForObject("/", String.class);
assertThat(body).isEqualTo("Hello World");
}
}
Please read more about Spring Boot Testing in the official documentation
https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-testing