Mocking class return NULL even after set the value manually

Question

I'm new to unit testing and try to understand how mocking works. I got the code as below, where I mock PdRequest.class using PowerMockRunner. However, it return Null for all the variables. I also tried to set the value manually but its the same. Is there anything that I missing? and Is it better if I just create new PdRequest() and set all the values manually?

What I tried -Try to use @PrepareForTest and @ExtendWith -Try to put initMocks(this)

@RunWith(PowerMockRunner.class)
public class PerformanceServiceImplTest 

 PdRequest pdRequest = mock(PdRequest.class);
        when(pdRequest.getLoginUserId()).thenReturn("42");
        when(pdRequest.getYear()).thenReturn("Year");
        doNothing().when(pdRequest).setLoginUserId((String) any());
        doNothing().when(pdRequest).setCurrMetric((String) any());
        doNothing().when(pdRequest).setCurrentLink((BreadCrumLink) any());
        doNothing().when(pdRequest).setFullView((String) any());
        doNothing().when(pdRequest).setManagerId((String) any());
        doNothing().when(pdRequest).setMetric((String) any());
        doNothing().when(pdRequest).setPdBoard((String) any());
        doNothing().when(pdRequest).setRegionId((String) any());
        doNothing().when(pdRequest).setRoleId((String) any());
        doNothing().when(pdRequest).setRoleLevel((Integer) any());
        doNothing().when(pdRequest).setRoleName((String) any());
        doNothing().when(pdRequest).setSalesAbf((String) any());
        doNothing().when(pdRequest).setSalesMm((String) any());
        doNothing().when(pdRequest).setSalesRsme((String) any());
        doNothing().when(pdRequest).setStaffId((String) any());
        doNothing().when(pdRequest).setStaffIdList((List<String>) any());
        doNothing().when(pdRequest).setTeamId((String) any());
        doNothing().when(pdRequest).setYear((String) any());
        pdRequest.setCurrMetric("Curr Metric");
        pdRequest.setCurrentLink(breadCrumLink);
        pdRequest.setFullView("Full View");
        pdRequest.setLoginUserId("42");
        pdRequest.setManagerId("42");
        pdRequest.setMetric("Metric");
        pdRequest.setPdBoard("Pd Board");
        pdRequest.setRegionId("us-east-2");
        pdRequest.setRoleId("42");
        pdRequest.setRoleLevel(1);
        pdRequest.setRoleName("Role Name");
        pdRequest.setSalesAbf("Sales Abf");
        pdRequest.setSalesMm("Sales Mm");
        pdRequest.setSalesRsme("Sales Rsme");
        pdRequest.setStaffId("42");
        pdRequest.setStaffIdList(new ArrayList<>());
        pdRequest.setTeamId("42");
        pdRequest.setYear("Year");

Output

Answer 1

Ignore what IntelliJ is showing you. That shows you the state, which is inherited from the class you're mocking. However, you haven't set that state in the mock, and that state is not returned when any method is called. Instead, you've configured the Mockito internal fields (CGLIB$BOUND etc.) to return those values.

Answer 2

I found a way of getting the value. From https://www.toptal.com/java/a-guide-to-everyday-mockito .

        PdRequest pdRequest = mock(PdRequest.class);
        doAnswer(InvocationOnMock::callRealMethod).when(pdRequest).setLoginUserId("42");
        doAnswer(InvocationOnMock::callRealMethod).when(pdRequest).getLoginUserId();
        pdRequest.setLoginUserId("42");
        assertEquals("42", pdRequest.getLoginUserId());