springboot OAuth2 request parameter binding not available in @WebMvcTest

Here's a @Controller mapping, like one in the Spring Security samples:

@Controller
class OAuth2LoginController {

    @GetMapping("/")
    public String index(Model model, @RegisteredOAuth2AuthorizedClient OAuth2AuthorizedClient authorizedClient,
            @AuthenticationPrincipal OAuth2User oauth2User) {
...

The handler method params cannot be bound in a @WebMvcTest:

@WebMvcTest(OAuth2LoginController.class)
class DemoApplicationTests {

    @Autowired
    MockMvc mvc;

    @Test
    public void rootWhenAuthenticatedReturnsUserAndClient() throws Exception {
        this.mvc.perform(get("/").with(oauth2Login()))
            .andExpect(model().attribute("userName", "test-subject"))
            .andExpect(model().attribute("clientName", "test"))
            .andExpect(model().attribute("userAttributes", Collections.singletonMap("sub", "test-subject")));
    }

}

unless you manually add 2 beans that in the app (not in the test) are added via autoconfiguration:

    @MockBean
    ClientRegistrationRepository clientRegistrationRepository;

    @TestConfiguration
    static class AuthorizedClient {
        @Bean
        public OAuth2AuthorizedClientRepository authorizedClientRepository() {
            return new HttpSessionOAuth2AuthorizedClientRepository();
        }
    }

Seems like maybe spring-boot-test-autoconfigure is missing something in spring.factories?

There's a sample app here: https://github.com/spring-projects/spring-security/blob/master/samples/boot/oauth2login/src/test/java/sample/web/OAuth2LoginControllerTests.java

Comment From: snicoll

Some interesting context from the Spring Security team:

OAuth2AuthorizedClientArgumentResolver is not being registered by OAuth2ClientConfiguration. This is automatically registered when using Spring MVC and both ClientRegistrationRepository and OAuth2AuthorizedClientRepository are registered.

Comment From: mbhave

Makes sense to me. I think we need to add OAuth2ClientAutoConfiguration (and the reactive equivalent) to spring.factories. Wonder if we should also do this for OAuth2ResourceServerAutoConfiguration.