Mock return fails with MockMvc on Junit - spring-boot

Question

Is it possible in a Junit test to make a post request and use BDDMockito.given () to set the return of a Service used by the method that responds to the RestController post? If it is possible, how to do it?
I'm trying to set the return of the Service and in the RestController method the Service returns null and the test fails.
These are the codes:
Test:
#RunWith(SpringRunner.class)
#SpringBootTest(classes = {SecurityBeanOverrideConfiguration.class, AccountApp.class})
public class UserSystemResourceIntTest {
#MockBean
private UserSystemService userSystemServiceMock;
private MockMvc restUserSystemMockMvc;
private UserSystem userSystem;
public static UserSystem createEntity(EntityManager em) {
UserSystem userSystem = new UserSystem()
.name(DEFAULT_NAME)
.email(DEFAULT_EMAIL)
.phone(DEFAULT_PHONE)
.documentCode(DEFAULT_DOCUMENT_CODE)
.documentType(DEFAULT_DOCUMENT_TYPE)
.gender(DEFAULT_GENDER)
.createdOn(null)
.updateOn(null)
.active(null)
.userId(null);
return userSystem;
}
#Before
public void initTest() {
userSystem = createEntity(em);
}
#Test
#Transactional
public void createUserSystem() throws Exception {
int databaseSizeBeforeCreate = userSystemRepository.findAll().size();
// Create the UserSystem
UserSystemDTO userSystemDTO = userSystemMapper.toDto(userSystem);
userSystemDTO.setLangKey(DEFAULT_LANG_KEY);
given(userSystemServiceMock.newAccount(userSystemDTO)).willReturn(createNewUserSystemDTO());
restUserSystemMockMvc.perform(post("/api/user-systems")
.contentType(TestUtil.APPLICATION_JSON_UTF8)
.content(TestUtil.convertObjectToJsonBytes(userSystemDTO)))
.andExpect(status().isCreated()); // FAIL BECAUSE RETURN STATUS 500
// Validate the UserSystem in the database
List<UserSystem> userSystemList = userSystemRepository.findAll();
assertThat(userSystemList).hasSize(databaseSizeBeforeCreate + 1);
UserSystem testUserSystem = userSystemList.get(userSystemList.size() - 1);
assertThat(testUserSystem.getName()).isEqualTo(DEFAULT_NAME);
assertThat(testUserSystem.getEmail()).isEqualTo(DEFAULT_EMAIL);
assertThat(testUserSystem.getPhone()).isEqualTo(DEFAULT_PHONE);
assertThat(testUserSystem.getDocumentCode()).isEqualTo(DEFAULT_DOCUMENT_CODE);
assertThat(testUserSystem.getDocumentType()).isEqualTo(DEFAULT_DOCUMENT_TYPE);
assertThat(testUserSystem.getGender()).isEqualTo(DEFAULT_GENDER);
assertThat(testUserSystem.getCreatedOn()).isNotNull(); //isEqualTo(DEFAULT_CREATED_ON);
assertThat(testUserSystem.getUpdateOn()).isNull(); // EqualTo(DEFAULT_UPDATE_ON);
assertThat(testUserSystem.isActive()).isEqualTo(DEFAULT_ACTIVE);
assertThat(testUserSystem.getUserId()).isEqualTo(DEFAULT_USER_ID);
// Validate the UserSystem in Elasticsearch
verify(mockUserSystemSearchRepository, times(1)).save(testUserSystem);
}
private static UserSystemDTO createNewUserSystemDTO() {
UserSystemDTO newUserSystemDTO = new UserSystemDTO(
DEFAULT_USER_ID, DEFAULT_NAME, DEFAULT_EMAIL,
DEFAULT_PASSWORD, DEFAULT_PHONE, DEFAULT_PHONE,
DEFAULT_DOCUMENT_TYPE, DEFAULT_GENDER, DEFAULT_LANG_KEY,
null, null, null, null);
return newUserSystemDTO;
}
}
RestController:
#RestController
#RequestMapping("/api")
public class UserSystemResource {
private final UserSystemService userSystemService;
private final UserSystemQueryService userSystemQueryService;
public UserSystemResource(UserSystemService userSystemService, UserSystemQueryService userSystemQueryService) {
this.userSystemService = userSystemService;
this.userSystemQueryService = userSystemQueryService;
}
#PostMapping("/user-systems")
public ResponseEntity<UserSystemDTO> createUserSystem(#Valid #RequestBody UserSystemDTO userSystemDTO) throws URISyntaxException {
log.debug("REST request to save UserSystem : {}", userSystemDTO);
if (userSystemDTO.getId() != null) {
throw new BadRequestAlertException("A new userSystem cannot already have an ID", ENTITY_NAME, "idexists");
}
UserSystemDTO result = userSystemService.newAccount(userSystemDTO);
return ResponseEntity.created(new URI("/api/user-systems/" + result.getId()))
.headers(HeaderUtil.createEntityCreationAlert(ENTITY_NAME, result.getId().toString()))
.body(result);
}
}
Console error:
java.lang.NullPointerException: null
at com.comp.account.web.rest.UserSystemResource.createUserSystem(UserSystemResource.java:60)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
Result test error:
createUserSystem(com.comp.account.web.rest.UserSystemResourceIntTest) Time elapsed: 205.661 s <<< FAILURE!
ava.lang.AssertionError: Status expected:<201> but was:<500>