How to Mock HttpSession and pass it as arguemnt to a method which works with session?

Question

I am using Spring framework 2.4.4 and Intellij Ultimate 2020

I would like to test this method tryGetUser on which I am passing HttpSession, but I can't resolve the problem, because when I am mocking it and setAttribute(); at the //Arrange part of the method it always ends with currentUserUsername to be null.

public User tryGetUser(HttpSession session) {
    String currentUserUsername = (String) session.getAttribute("currentUserUsername");
***// Here this local variable currentUsername is always null;***
    if (currentUserUsername == null) {
        throw new AuthorizationException("No logged in user.");
    }

    try {
        return userService.getByUsername(currentUserUsername);
    } catch (EntityNotFoundException e) {
        throw new AuthorizationException("No logged in user.");
    }
}

Here you can see how I am trying to Mock it, but actually, the session is remaining empty or I don't know, but when the service method starts to execute the attribute is not there.

@ExtendWith(MockitoExtension.class)
public class LoginServiceMvcTests {

    @Mock
    UserRepository mockUserRepository;

    @Mock
    UserService mockUserService;

    @InjectMocks
    MockHttpSession mockHttpSession;

    @InjectMocks
    LoginServiceMvc userService;

    private User junkie;
    private User organizer;

    @BeforeEach
    public void setup() {
        junkie = Helpers.createJunkie();
        organizer = Helpers.createOrganizer();
    }

    @Test
    public void tryGetUser_Should_GetUserFromSession_When_UserIsLogged() {

        // Arrange
        mockHttpSession.setAttribute("luboslav", junkie);
        Mockito.when(mockUserService.getByUsername("luboslav"))
                .thenReturn(junkie);

        // Act
        userService.tryGetUser(mockHttpSession);

        // Assert
        Mockito.verify(mockUserService, Mockito.times(1))
                .getByUsername("luboslav");
    }
}

Why are you reinventing authentication instead of using Spring Security? — chrylis -cautiouslyoptimistic-, Apr 06 '21 at 01:09
I am not allowed to use it for this project. I have to learn it alone after this project. The reason which I was given by the mentor was it could break my project very easy hours before the defense of the project. — oneofakind, Apr 06 '21 at 01:54

score 3 · Accepted Answer · answered Apr 06 '21 at 01:34

3

From Jon skeet answer Mockito doesn't work that way, so you need to actually mock the call instead of setting attribute

Mockito.when(mockHttpSession. getAttribute("currentUserUsername"))
            .thenReturn("name");

And also HttpSession should be annotated with @Mock not @InjectMocks

@Mock
HttpSession httpSession;

answered Apr 06 '21 at 01:34

Ryuzaki L

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Thank you for the information and the solution. It worked. – oneofakind Apr 06 '21 at 01:59

score 1 · Answer 2 · answered Apr 06 '21 at 02:07

Use MockHttpSession, which is an actual real object (not just a Mockito interface mock) that is intended for exactly this type of testing. It's basically an empty/blank container, so you don't have to mock out all the standard behavior, just fill it with whatever attributes you want.

How to Mock HttpSession and pass it as arguemnt to a method which works with session?

2 Answers2