Spring tests - mock returns null - spring

Question

I have a small issue with mocking methods . Where mock should return an predefined object, it returns null. here is test set up:
#RunWith(SpringRunner.class)
#SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class UserControllerTest {
#Autowired
WebApplicationContext webContext;
#MockBean
UserTransferService userTransferService;
#MockBean
UserService userService;
MockMvc mockMvc;
private User user = DummyObjects.getDummyUser();
private User modifiedUser = DummyObjects.getModifiedUser();
private UserTO userTO = DummyObjects.getDummyUserTO();
private UserTO modifiedUserTO = DummyObjects.getModifiedUserTO();
#Before
public void setUp() throws Exception {
List<User> users = new ArrayList<>();
users.add(modifiedUser);
users.add(user);
given(this.userTransferService.getTO(user)).willReturn(userTO);
given(this.userTransferService.getObject(userTO)).willReturn(user);
given(this.userTransferService.getTO(modifiedUser)).willReturn(modifiedUserTO);
given(this.userTransferService.getObject(modifiedUserTO)).willReturn(modifiedUser);
given(this.userService.findAll()).willReturn(users);
given(this.userService.save(user)).willReturn(user);
given(this.userService.removeById(1)).willReturn(true);
given(this.userService.getById(1)).willReturn(user);
given(this.userService.getById(2)).willReturn(null);
given(this.userService.modify(modifiedUser)).willReturn(modifiedUser);
given(this.userService.findByLogin(user.getLogin())).willReturn(user);
given(this.userService.findByLogin("AAA")).willReturn(null);
mockMvc = MockMvcBuilders
.webAppContextSetup(webContext)
.apply(springSecurity())
.build();
}
test itself:
#Test
public void shouldAddUser() throws Exception {
mockMvc.perform(post("/api/user")
.content(TestingUtility.asJsonString(userTO))
.contentType(MediaType.APPLICATION_JSON)
.accept(MediaType.APPLICATION_JSON)
.with(csrf().asHeader()))
.andExpect(status().is(200))
.andExpect(content().json(TestingUtility.asJsonString(userTO)));
}
and Controller method:
#RequestMapping(method = RequestMethod.PUT, consumes = MediaType.APPLICATION_JSON_UTF8_VALUE)
public UserTO modifyUser(#RequestBody UserTO userTO, UsernamePasswordAuthenticationToken principal) throws IllegalAccessException{
User user = userTransferService.getObject(userTO);
if (principal.getName().equals(userTO.getLogin()) || permissionService.hasPermission(principal,Permission.SU)) {
return userTransferService.getTO(userService.modify(user));
} else {
throw new IllegalAccessException("You are not allowed to modify user");
}
}
User is null, but UserTO is filled. So mocked method UserTransferService.getObject(userTO) is not working properly.