[FIXED] RestAssuredMvc cannot resolve Pageable

Issue

I'm using RestAssured in my tests, in which I also mock the service layers. In order to do so, I had to change my test setup from webAppContextSetup to standAloneSetup. This way, I'm able to create an instance of my controller and @InjectMock the mocked services into it.

Code:

@BeforeEach
public void setup() {
    RestAssuredMockMvc.standaloneSetup(controller); -> Brakes test
    RestAssuredMockMvc.webAppContextSetup(webApplicationContext); -> Works fine
}

The test is the following:

Mockito.when(findService.findUnreadNotificationItems(Mockito.any(), Mockito.any(), Mockito.any()))
                .thenReturn(new PageImpl<>(List.of(generateDummyNotificationItemWithId())) {
                });

        final String response = given()
                .queryParam("page", "0")
                .queryParam("size", "10")
                .contentType(ContentType.JSON)
                .log().all()
                .when()
                .get("/notification/{groupName}/{userName}", "subacquiring_viewers", "John.Doe")
                .then()
                .log().all()
                .assertThat()
                .statusCode(HttpStatus.OK.value())
                .extract().asString();

And the endpoint:

public Page<NotificationItemResponse> findUnreadNotifications(@PageableDefault(size = DEFAULT_PAGE_SIZE) final Pageable pageable,
            @PathVariable final String groupName, @PathVariable final String userName)

When I use the standAloneSetup I get the error:

No primary or single unique constructor found for interface org.springframework.data.domain.Pageable

I've seen a very similar question with good answers here, but RestAssuredMvc does not have any resolvers, or at least I found nothing on it searching the web. Can anyone help me resolve Pageables using RestAssuredMvc's standAloneSetup?

Solution

I found out that standaloneSetup has an overload that takes an MockMvcBuilder as argument. I could accomplish the customArgumentResolver with the following:

@BeforeEach
    public void setup() {
        RestAssuredMockMvc.standaloneSetup(MockMvcBuilders.standaloneSetup(controller).setCustomArgumentResolvers(new PageableHandlerMethodArgumentResolver())
                .setControllerAdvice(new NotificationItemControllerAdvice()));
    }

Answered By - Pelicer
Answer Checked By - David Marino (JavaFixing Volunteer)