How to return Page content in Spring Boot Unit test service layer? How to mock this data with some values and later on test it?

Service that needs to be tested:

@Service
@RequiredArgsConstructor
@Transactional(readOnly = true)
public class CampaignReadServiceImpl02 {

    private final CampaignRepository campaignRepository;


    public Page<Campaign> getAll(int page, int size) {

        Pageable pageable = PageRequest.of(page, size);

        Page<Campaign> pages = campaignRepository.findAll(pageable);

        return pages;
    }
}

The class that mocks data in Unit test

@Slf4j
@ExtendWith(MockitoExtension.class)
public class CampaignReadServiceTest {

    @Mock
    private CampaignRepository campaignRepository;

    private CampaignReadServiceImpl02 campaignReadServiceImpl02;

    @BeforeEach
    public void beforeEach() {
        campaignReadServiceImpl02 = new CampaignReadServiceImpl02(campaignRepository);
    }

    @Test
    public void testGetAll02() {
        log.info("Testing get all campaigns method");

        Page<Campaign> page = Mockito.mock(Page.class);

        Mockito.when(campaignRepository.findAll(Mockito.any(Pageable.class))).thenReturn(page);

        Page<Campaign> result = campaignReadServiceImpl02.getAll(2, 2);

        Assertions.assertNotNull(result);

        Mockito.verify(campaignRepository, Mockito.times(1)).findAll(Mockito.any(Pageable.class));
        Mockito.verifyNoMoreInteractions(campaignRepository);
    }
}

How to mock Page<Campaign> page = Mockito.mock(Page.class); to get result.getContent(); when Service repository is injected in Service..

I can’t test result.getContent() because I don’t have data from repository, maube because I need to change mock Page<Campaign> page with Page.class to something else?

How to properly mock Page<Campaign> page = Mockito.mock(Page.class); that will return some data later on in service: result.getContent().name(), etc..