How add some content to Mockito mocked Pageable class? - mockito

Question

I want testing pagination.
I want add some fake content to my Page mocked class.
How can I?
This is my test (refactoring it from a previous test), I'm using Junit5 and of course I get that No valut at JSON path $.content.lenght() and so on (of course, Page is empty):
/**
* index
*/
#WithMockUser("username")
#Test
void testCanIndex() throws Exception {
var transaction01 = BankAccountTransactionsControllerTest.validBankAccountTransactionsEntity(1L,
new BigDecimal(99.99), "First Transaction");
var transaction02 = BankAccountTransactionsControllerTest.validBankAccountTransactionsEntity(2L,
new BigDecimal(150.00), "Second Transaction");
var result = new ArrayList<BankAccountTransactionsEntity>();
result.add(transaction01);
result.add(transaction02);
Page<BankAccountTransactionsEntity> items = mock(Page.class);
when(bankAccountTransactionsService.index(0, 1, "id", "desc")).thenReturn(items);
mvc.perform(get("/api/v1/bank-account-transactions/")).andExpect(status().isOk())
.andExpect(jsonPath("$.content.length()", is(2))).andExpect(jsonPath("$[0].id", is(1)))
.andExpect(jsonPath("$.content[1].id", is(2))).andExpect(jsonPath("$[0].amount", is(new BigDecimal(99.99))))
.andExpect(jsonPath("$.content[1].amount", is(150)))
.andExpect(jsonPath("$.content[0].purpose", is("First Transaction")))
.andExpect(jsonPath("$.content[1].purpose", is("Second Transaction")))
.andExpect(jsonPath("$.content[0]", Matchers.hasKey("transactionDate")))
.andExpect(jsonPath("$.content[1]", Matchers.hasKey("transactionDate")));
}
Edit
I made a change, calling directly a PageImpl
#Test
void testCanIndex() throws Exception {
var transaction01 = BankAccountTransactionsControllerTest.validBankAccountTransactionsEntity(1L,
new BigDecimal(99.99), "First Transaction");
var transaction02 = BankAccountTransactionsControllerTest.validBankAccountTransactionsEntity(2L,
new BigDecimal(150.00), "Second Transaction");
var result = new ArrayList<BankAccountTransactionsEntity>();
result.add(transaction01);
result.add(transaction02);
Page<BankAccountTransactionsEntity> items = new PageImpl<>(result);
when(bankAccountTransactionsService.index(0, 1, "id", "desc")).thenReturn(items);
mvc.perform(get("/api/v1/bank-account-transactions/")).andExpect(status().isOk())
.andExpect(jsonPath("$.content.length()", is(2)));
}
But body returned is empty
MockHttpServletRequest:
HTTP Method = GET
Request URI = /api/v1/bank-account-transactions/
Parameters = {}
Headers = []
Body = null
Session Attrs = {}
Handler:
Type = com.bitbank.controllers.BankAccountTransactionsController
Method = com.bitbank.controllers.BankAccountTransactionsController#index(Integer, Integer, String, String)
Async:
Async started = false
Async result = null
Resolved Exception:
Type = null
ModelAndView:
View name = null
View = null
Model = null
FlashMap:
Attributes = null
MockHttpServletResponse:
Status = 200
Error message = null
Headers = [Vary:"Origin", "Access-Control-Request-Method", "Access-Control-Request-Headers", X-Content-Type-Options:"nosniff", X-XSS-Protection:"1; mode=block", Cache-Control:"no-cache, no-store, max-age=0, must-revalidate", Pragma:"no-cache", Expires:"0", X-Frame-Options:"DENY"]
Content type = null
Body =
Forwarded URL = null
Redirected URL = null
Cookies = []