PageImpl failing when the content result is empty

Question

I've been struggling for a while with a test in which I purposely return an empty pageable result. This is my PageImpl implementation:

public class RestPageImpl<T> extends PageImpl<T> {

    private static final long serialVersionUID = -3940752275692196046L;

    @JsonCreator(mode = JsonCreator.Mode.PROPERTIES)
    public RestPageImpl(@JsonProperty("content") final List<T> content,
            @JsonProperty("number") final int number,
            @JsonProperty("size") final int size,
            @JsonProperty("pageable") final JsonNode pageable,
            @JsonProperty("last") final boolean last,
            @JsonProperty("totalPages") final int totalPages,
            @JsonProperty("sort") final JsonNode sort,
            @JsonProperty("first") final boolean first,
            @JsonProperty("numberOfElements") final int numberOfElements,
            @JsonProperty("totalElements") final int totalElements) {

        super(content, PageRequest.of(number, size), totalElements);
    }
}

And in my test class, I'm using RestAssured to test my controller. This is the calling:

    @Test
    @SneakyThrows
    void Should_Find_Unread_Notifications_Successfully() {
        final NotificationItem notificationItem = generateDummyNotificationItemWithoutId();
        notificationItemRepository.save(notificationItemMapper.toDocument(notificationItem));

        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();

        final Page<NotificationItemResponse> notificationItemResponsePage = mapper.readValue(response,
                new TypeReference<RestPageImpl<NotificationItemResponse>>() {
                });

        assertEquals(1, notificationItemResponsePage.getNumberOfElements());
        assertEquals(1, notificationItemResponsePage.getSize());
        assertEquals(Sort.unsorted(), notificationItemResponsePage.getSort());
    }

The test throws the following error: Cannot construct instance of 'com.project.notification.RestPageImpl', problem: Page size must not be less than one!. I have other tests with the exact same implementation working fine. The issue here seems to be the content being empty. How can I get the return of an empty page? I've been through this SO question and a lot of documentation, and couldn't figure it out.

PageImpl failing when the content result is empty

0 Answers0