Unit testing JSF View Scoped bean

I'm trying to work out the best way to unit test a javax.faces.view.ViewScoped bean, for example

@Named
@ViewScoped
public class UserController implements Serializable
{

    @Inject
    private UserService userService;

    private List<User> users;

    private User user;

    /**
     * Init method used to initialise users list
     */
    @PostConstruct
    public void init()
    {
        users = userService.listAll();
    }

    /**
     * Delete the specified user
     *
     * @param user User to be deleted
     */
    public void delete(User user)
    {
        userService.deleteUser(user);
    }

    /**
     * Add a user with the specified name
     *
     * @param usr Name of the user to be added
     */
    public void add(String usr)
    {
        user = new User();
        user.setName(usr);
        userService.addUser(user);
    }

    public List<User> getUsers()
    {
        return users;
    }

    public User getUser()
    {
        return user;
    }

}

I believe I shouldn't need to test getUsers() and getUser(), but I should be testing init(), add() and delete().

After some googling around the topic I found the following answer http://ift.tt/1FyfegG

Which so far has given me this test code

@RunWith(PowerMockRunner.class)
@PrepareForTest(
    {
        FacesContext.class
    })
public class UserControllerTest
{

    private final Map<String, Object> viewMap = Maps.newHashMap();

    @Mock
    private UserService service;

    @Mock
    private FacesContext facesContext;

    @Mock
    private UIViewRoot uiViewRoot;

    @Before
    public void setUp()
    {
        Mockito.doReturn(this.uiViewRoot).when(this.facesContext).getViewRoot();
        Mockito.doReturn(this.viewMap).when(this.uiViewRoot).getViewMap();

        PowerMockito.mockStatic(FacesContext.class);
        Mockito.when(FacesContext.getCurrentInstance()).thenReturn(this.facesContext);
    }

    @Test
    public void testUsersListInitialised()
    {
        FacesContext.getCurrentInstance().getViewRoot().getViewMap();

    }

}

I'm getting a little confused however by the view map and the UIViewRoot, I believe with this code the map will be empty

So going by this answer http://ift.tt/1LisFsj

I won't simply be able to say

Map<String, Object> viewMap = FacesContext.getCurrentInstance().getViewRoot().getViewMap();
UserController userController = (UserController) viewMap.get("userController");

What am I missing? Am I going about this the right way?