[FIXED] Spring webflux, testing `ServerResponse`

Issue

How can I test a handler method that receive ServerRequest and return Mono<ServerResponse> ?

I can create a ServerRequest via org.springframework.mock.web.reactive.function.server.MockServerRequest.builder(). And assert on the ServerResponse.statusCode(). However I would like to test the body of this ServerResponse but there is no way to extract it.

ServerResponse response = target.search(MockServerRequest.builder()
    .method(HttpMethod.GET)
    .build()
  ).block();

assertThat(response.statusCode()).isEqualTo(HttpStatus.OK);
//assertThat(response.body()).isNotNull();

I don't want to do a broader test with the WebTestClient, I would like to test all possible cases of response with unit tests.

Thanks

Solution

So, it seems that the best solution is to use the WebTestClient. However this one can be used without a running server;

The spring-test module includes a WebTestClient that can be used to test WebFlux server endpoints with or without a running server.

-- https://docs.spring.io/spring/docs/5.0.0.BUILD-SNAPSHOT/spring-framework-reference/html/web-reactive.html#web-reactive-tests

The trick is to use the bindTo..() builder method. In my case bindToRouterFunction(new MyRouter(new MyHandler())) works well

Answered By - gervais.b
Answer Checked By - Terry (JavaFixing Volunteer)