get session value in Mockito

this is my mockito code to call login servlet to get session and share the session between test case

public class MokitoExtension implements BeforeAllCallback, AfterAllCallback {

    protected HttpSession httpSession;

    public HttpSession getHttpSession() {
        return httpSession;
    }

    @Override
    public void beforeAll(ExtensionContext extensionContext) throws Exception {
        Map<String, Object> attributes          = new HashMap<>();
        HttpServletRequest  request             = mock(HttpServletRequest.class);
        HttpServletResponse response            = mock(HttpServletResponse.class);
        ServletOutputStream servletOutputStream = mock(ServletOutputStream.class);
                            httpSession         = mock(HttpSession.class);
         
        JSONObject reqObj = new JSONObject();
        reqObj.put("AccessorCode", "userName");
        reqObj.put("password"    , "password");

        when(request.getReader()).thenReturn(new BufferedReader(new StringReader(reqObj.toString())));
        when(request.getHeader("Content-Type")).thenReturn("application/json");
        when(response.getOutputStream())       .thenReturn(servletOutputStream);
        when(request.getSession())             .thenReturn(httpSession);

        // this line call login servlet and set session.setAttribute("accessor", authenticateAccessor);
        new LogInAPI().doPost(request, response);

    }

Now When I Want to get request.getSession("accessor") but return null

then Try to get Session with this way

 Mockito.doAnswer(new Answer() {
            @Override
            public Object answer(InvocationOnMock aInvocation) throws Throwable {
                String key   = (String) aInvocation.getArguments()[0];
                Object value = aInvocation.getArguments()[1];
                attributes.put(key, value);
                return null;
            }
        }).when(httpSession).setAttribute(anyString(), anyObject())

but this method don't work for put session attribute into hashMap

I see some posts like this click here, partial-mocking-on-httpsession but not solve my issue