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Update MockMvc section on Streaming in the docs

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Closes gh-32687
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rstoyanchev
2024-05-13 12:40:46 +01:00
parent df8374693b
commit ca9eb57c94
1 changed files with 7 additions and 29 deletions
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36
src/docs/asciidoc/testing.adoc
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@@ -7670,35 +7670,13 @@ or reactive type such as Reactor `Mono`:
[[spring-mvc-test-vs-streaming-response]]
===== Streaming Responses
The best way to test streaming responses such as Server-Sent Events is through the
<<WebTestClient>> which can be used as a test client to connect to a `MockMvc` instance
to perform tests on Spring MVC controllers without a running server. For example:
[source,java,indent=0,subs="verbatim,quotes",role="primary"]
.Java
----
WebTestClient client = MockMvcWebTestClient.bindToController(new SseController()).build();
FluxExchangeResult<Person> exchangeResult = client.get()
.uri("/persons")
.exchange()
.expectStatus().isOk()
.expectHeader().contentType("text/event-stream")
.returnResult(Person.class);
// Use StepVerifier from Project Reactor to test the streaming response
StepVerifier.create(exchangeResult.getResponseBody())
.expectNext(new Person("N0"), new Person("N1"), new Person("N2"))
.expectNextCount(4)
.consumeNextWith(person -> assertThat(person.getName()).endsWith("7"))
.thenCancel()
.verify();
----
`WebTestClient` can also connect to a live server and perform full end-to-end integration
tests. This is also supported in Spring Boot where you can
{doc-spring-boot}/html/spring-boot-features.html#boot-features-testing-spring-boot-applications-testing-with-running-server[test a running server].
You can use `WebTestClient` to test <<testing/testing-webtestclient.adoc#webtestclient-stream,streaming responses>>
such as Server-Sent Events. However, `MockMvcWebTestClient` doesn't support infinite
streams because there is no way to cancel the server stream from the client side.
To test infinite streams, you'll need to
<<testing/testing-webtestclient.adoc#webtestclient-server-config,bind to>> a running server,
or when using Spring Boot,
{doc-spring-boot}/html/spring-boot-features.html#boot-features-testing-spring-boot-applications-testing-with-running-server[test with a running server].
[[spring-mvc-test-server-filters]]