Im trying to test a controller, Author Controller, which returns a view with a model. The problem is on the testInitUpdateAuthor() test where its not able to find the model or attribute name specifically. All other methods are fine with their model/attribute tests.
Any advice?
#Slf4j
#Controller
public class AuthorController {
private final AuthorService authorService;
private final String CREATEORUPDATEFORM = "author/createOrUpdateAuthor";
public AuthorController(AuthorService authorService) {
this.authorService = authorService;
}
#GetMapping("/author/{id}/update")
public String updateAuthor(#PathVariable("id") Long id, Model model) {
model.addAttribute("author", authorService.findById(id));
return CREATEORUPDATEFORM;
}
#ExtendWith(MockitoExtension.class)
#SpringBootTest
class AuthorControllerTest {
MockMvc mockMvc;
#Mock
AuthorService authorService;
#InjectMocks
AuthorController authorController;
#BeforeEach
void setUp() {
mockMvc = MockMvcBuilders.standaloneSetup(authorController).build();
}
#Test
void getIndex() throws Exception {
mockMvc.perform(get("/author/index"))
.andExpect(status().isOk())
.andExpect(view().name("author/index"))
.andExpect(model().attributeExists("authors"));
}
#Test
void testInitUpdateAuthor() throws Exception {
when(authorService.findById(anyLong())).thenReturn(Author.builder().id(1L).build());
mockMvc.perform(get("/author/1/update"))
.andExpect(status().isOk())
.andExpect(view().name("author/createOrUpdateAuthor"))
.andExpect(model().attributeExists("author"));
}
}
I am having dificulties with using MockMvc.
Here I have simple Service and controller classes:
Service:
#Slf4j
#Service
public class EmployeeService {
//...
public Employee GetSample() {
//...
//filling Employee Entities
return new Employee(
"Harriet"
, "random"
, 25);
}
}
controller:
#RestController
#RequestMapping(value = "/info")
#RequiredArgsConstructor(onConstructor = #__(#Autowired))
#Validated
public class EmployeeController {
private final EmployeeService employeeService;
#PostMapping("/GetEmployee")
public ResponseEntity<Employee> GetEmployee() {
Employee employee = employeeService.GetSample();
return new ResponseEntity<>(employee, HttpStatus.OK);
}
}
Test:
#RunWith(SpringJUnit4ClassRunner.class)
#SpringBootTest
public class EmployeeTestCase {
private MockMvc mockMvc;
#InjectMocks
private EmployeeController EmployeeController;
#Mock
private EmployeeService employeeService;
#Before
public void setUp() {
this.mockMvc = MockMvcBuilders.standaloneSetup(employeeController).build();
}
#Test
public void getEmployee() throws Exception {
this.mockMvc.perform(MockMvcRequestBuilders.post("/info/GetEmployee")).andDo(print());
}
}
when I try to use MockMvc I get null body. It seems employee is null. But I didn't understand why.
I thought that when test uses perform, it should initialise employee and later on it should't be null.
I tried to cut the code as much as possible. I hope it is not long.
Note : also tried to use Mockito.when(employeeController.GetEmployee()).thenCallRealMethod();
The #SpringBootTest annotation loads the complete Spring application
context. That means you do not mock your layers
(Services/Controllers).
If you wanted to test specific layers of your application, you could look into test slice annotations offered by Springboot: https://docs.spring.io/spring-boot/docs/current/reference/html/test-auto-configuration.html
In contrast, a test slice annotation only loads beans required to test a particular layer. And because of this, we can avoid unnecessary mocking and side effects.
An example of a Test Slice is #WebMvcTest
#ExtendWith(SpringExtension.class)
#WebMvcTest(controllers = HelloController.class,
excludeFilters = {
#ComponentScan.Filter(type = FilterType.ASSIGNABLE_TYPE, classes = SecurityConfig.class)
}
)
public class HelloControllerTest {
#Autowired
private MockMvc mvc;
#Test
public void hello() throws Exception {
String hello = "hello";
mvc.perform(get("/hello"))
.andExpect(status().isOk())
.andExpect(content().string(hello));
}
#Test
public void helloDto() throws Exception {
String name = "hello";
int amount = 1000;
mvc.perform(
get("/hello/dto")
.param("name", name)
.param("amount", String.valueOf(amount)))
.andExpect(status().isOk())
.andExpect(jsonPath("$.name", is(name)))
.andExpect(jsonPath("$.amount", is(amount)));
}
}
However if you really wanted to load up the SpringBoot Application context, say for an Integration Test, then you have a few options:
#SpringBootTest
#AutoConfigureMockMvc
public class TestingWebApplicationTest {
#Autowired
private MockMvc mockMvc;
#Test
public void shouldReturnDefaultMessage() throws Exception {
this.mockMvc.perform(get("/")).andDo(print()).andExpect(status().isOk())
.andExpect(content().string(containsString("Hello, World")));
}
}
#RunWith(SpringJUnit4ClassRunner.class)
#SpringBootTest
public class AuctionControllerIntTest {
#Autowired
AuctionController controller;
#Autowired
ObjectMapper mapper;
MockMvc mockMvc;
#Before
public void setUp() throws Exception {
System.out.println("setup()...");
mockMvc = MockMvcBuilders.standaloneSetup(controller).build();
}
#Test
public void create_ValidAuction_ShouldAddNewAuction() throws Exception {
final Auction auction = new Auction(
"Standing Desk",
"Stand up desk to help you stretch your legs during the day.",
"Johnnie34",
350.00);
mockMvc.perform(post("/auctions")
.contentType(MediaType.APPLICATION_JSON)
.content(toJson(auction)))
.andExpect(status().isCreated());
}
}
Lets say you don't want to load up any layers at all, and you want to mock everything, such as for example a Unit Test:
#RunWith(MockitoJUnitRunner.class)
class DemoApplicationTest {
#Mock
private UserRepository userRepository;
private Demo noneAutoWiredDemoInstance;
#Test
public void testConstructorCreation() {
MockitoAnnotations.initMocks(this);
Mockito.when(userRepository.count()).thenReturn(0L);
noneAutoWiredDemoInstance = new Demo(userRepository);
Assertions.assertEquals("Count: 0", noneAutoWiredDemoInstance.toString());
}
}
I have a spring boot REST API with a GET method that returns data available in a DB. I am attempting to write an integration test to test this API method. I have configured the test to use the H2 database. I am trying to add some mock data to the database before the test is executed and see if the API retrieves that data. Following is the code I have written so far.
#RunWith(SpringRunner.class)
#SpringBootTest
#AutoConfigureMockMvc
#TestPropertySource(locations = "classpath:application-test.properties")
public class MetaControllerTest {
#Autowired
private MockMvc mvc;
#Autowired
private ProvinceDAO provinceDAO;
#Transactional
#Before
public void addData () {
Province southern = getProvinceEntity("Southern", "දකුණ", "தென்");
provinceDAO.createEntity(southern);
System.out.println(provinceDAO.findAll(Province.class).size());
}
#Test
public void testGetProvinces() throws Exception {
MvcResult result = mvc.perform(get("/meta/provinces"))
.andExpect(status().isOk())
.andExpect(content().contentTypeCompatibleWith(MediaType.APPLICATION_JSON))
.andReturn();
System.out.println(result.getResponse().getContentAsString());
}
}
However, when I run this code, I am getting an error saying "org.springframework.dao.InvalidDataAccessApiUsageException: No transactional EntityManager available; nested exception is java.lang.IllegalStateException: No transactional EntityManager available"
I have also attempted using #MockBean instead of #Autowired to bind the provinceDAO. Even though this prevents the error, it does not persist the entity in the database.
How should I write my testcase to test my method here?
Update:
application-test.properties
spring.datasource.url = jdbc:h2:mem:test
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.H2Dialect
Entity -> Province.java
#Entity
#Table(name = "w4a_province")
public class Province {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "id")
private int id;
#Column(name = "province_name")
private String name;
#Column(name = "province_name_si")
private String nameSi;
#Column(name = "province_name_ta")
private String nameTa;
.
.
}
GenericDAO.java
#Repository
public class GenericDAO<T> implements IGenericDAO<T> {
#PersistenceContext
private EntityManager em;
#Override
public Session getCurrentSession() {
return this.em.unwrap(Session.class);
}
#Override
public T findByPrimaryKey(Class<T> clazz, Object primaryKey) {
return getCurrentSession().find(clazz, primaryKey);
}
#Override
public List<T> findAll(Class<T> clazz) {
DetachedCriteria criteria = DetachedCriteria.forClass(clazz);
return criteria.getExecutableCriteria(getCurrentSession()).list();
}
#Override
public T createEntity(T entity) {
getCurrentSession().save(entity);
return entity;
}
ProvinceDAOImpl.java
#Repository
public class ProvinceDAOImpl extends GenericDAO<Province> implements ProvinceDAO {
}
MetaController.java
#RestController
#PreAuthorize("permitAll()")
public class MetaController {
private final MetaService metaService;
#Autowired
public MetaController(MetaService metService) {
this.metaService = metService;
}
#GetMapping("/meta/provinces")
public ResponseEntity<List<ProvinceDTO>> getProvinces() {
if (logger.isDebugEnabled()) {
logger.debug("Retrieving list of provinces.");
}
List<ProvinceDTO> provinces = metaService.getProvinces();
return ResponseEntity.ok(provinces);
}
}
MetaServiceImpl.java
#Service
#Transactional
public class MetaServiceImpl implements MetaService {
private final ProvinceDAO provinceDAO;
#Autowired
public MetaServiceImpl(ProvinceDAO provnceDAO) {
this.provinceDAO = provnceDAO;
}
public List<ProvinceDTO> getProvinces() {
if (logger.isDebugEnabled()) {
logger.debug("Obtaining a list of provinces from database.");
}
List<Province> entities = provinceDAO.findAll(Province.class);
if (logger.isDebugEnabled()) {
logger.debug("Converting province entities to dtos.");
}
List<ProvinceDTO> dtos = new ArrayList<>();
for (int i = 0; i < entities.size(); i++) {
Province entity = entities.get(i);
if (LocaleContextHolder.getLocale().getLanguage().equals(
GlobalConstants.LanguageIdentifiers.SINHALA_LANGUAGE_TAG)) {
dtos.add(new ProvinceDTO(entity.getId(), entity.getNameSi()));
} else if (LocaleContextHolder.getLocale().getLanguage().equals(
GlobalConstants.LanguageIdentifiers.TAMIL_LANGUAGE_TAG)) {
dtos.add(new ProvinceDTO(entity.getId(), entity.getNameTa()));
} else {
dtos.add(new ProvinceDTO(entity.getId(), entity.getName()));
}
}
return dtos;
}
}
I managed to feed the database with the required data by placing a SQL script data-h2.sql with insert queries at the test/resources folder. This prevented the requirement to use an EntityManager or a DAO.
Furthermore, I added the following property to the application-test.properties file.
spring.datasource.platform=h2
In Order to test Rest Api You can try functional test as well as integration test.
You can prepare your own response formate as required and check whether the same is returned or else you can also verify whether the data from db is fine or not.Plz check the below example
#RunWith(SpringJUnit4ClassRunner.class)
#SpringBootTest(classes = FactsMain.class)
#WebAppConfiguration
public abstract class BaseTest {
protected MockMvc mvc;
#Autowired
WebApplicationContext webApplicationContext;
protected void setUp() {
mvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).build();
}
protected String mapToJson(Object obj) throws JsonProcessingException {
ObjectMapper objectMapper = new ObjectMapper();
return objectMapper.writeValueAsString(obj);
}
protected <T> T mapFromJson(String json, Class<T> clazz)
throws JsonParseException, JsonMappingException, IOException {
ObjectMapper objectMapper = new ObjectMapper();
return objectMapper.readValue(json, clazz);
}
}
In First test case i am forming the response format and trying to return the same and then validating the same.Here i don't need the db data so i have kept service as mock instead of auto wired.And used ObjectMapper for converting json to java and then java obj to json from base Test class.
public class PersonalDetailsControllerTest extends BaseTest {
#MockBean
private IPersonalService service;
private static final String URI = "/api/personalDetails";
#Override
#Before
public void setUp() {
super.setUp();
}
#Test
public void testGet() throws Exception {
PersonalDetailsEntity entity = new PersonalDetailsEntity();
List<PersonalDetailsEntity> dataList = new ArrayList<PersonalDetailsEntity>();
FactsAdminResponse<PersonalDetailsEntity> dataResponse = new FactsAdminResponse<PersonalDetailsEntity>();
entity.setId(1);
entity.setName(“Anthony Holmes”);
entity.setAge(26);
entity.setCity(“Banglore”);
entity.setCountry(“India”);
dataList.add(entity);
dataResponse.setData(dataList);
Mockito.when(service.getBuildings()).thenReturn(dataList);
RequestBuilder requestBuilder = MockMvcRequestBuilders.get(URI)
.accept(MediaType.APPLICATION_JSON);
MvcResult mvcResult = mvc.perform(requestBuilder).andReturn();
MockHttpServletResponse response = mvcResult.getResponse();
String expectedJson = this.mapToJson(dataResponse);
String outputInJson = mvcResult.getResponse().getContentAsString();
assertEquals(HttpStatus.OK.value(), response.getStatus());
assertEquals(expectedJson, outputInJson);
}
}
In below case we are getting the actual data in json format as we are doing rest api call and then just validating the status apart from status you can also cross check the data
public class PersonalDetailsControllerTest extends BaseTest {
private static final String URI = "/api/personalDetails";
#Override
#Before
public void setUp() {
super.setUp();
}
#Test
public void getGet() throws Exception {
MvcResult mvcResult = mvc.perform(MockMvcRequestBuilders.get(URL)
.accept(MediaType.APPLICATION_JSON_VALUE)).andReturn();
int status = mvcResult.getResponse().getStatus();
assertEquals(200, status);
String content = mvcResult.getResponse().getContentAsString();
//you got the content in string format now you can also validate the data
}
I am new to Junits and Mockito, I am writing a Unit test class to test my service class CourseService.java which is calling findAll() method of CourseRepository.class which implements CrudRepository<Topics,Long>
Service Class
#Service
public class CourseService {
#Autowired
CourseRepository courseRepository;
public void setCourseRepository(CourseRepository courseRepository) {
this.courseRepository = courseRepository;
}
public Boolean getAllTopics() {
ArrayList<Topics> topicList=(ArrayList<Topics>) courseRepository.findAll();
if(topicList.isEmpty())
{
return false;
}
return true;
}
}
Repository class
public interface CourseRepository extends CrudRepository<Topics,Long>{
}
Domain class
#Entity
#Table(name="Book")
public class Topics {
#Id
#Column(name="Topicid")
private long topicId;
#Column(name="Topictitle",nullable=false)
private String topicTitle;
#Column(name="Topicauthor",nullable=false)
private String topicAuthor;
public long getTopicId() {
return topicId;
}
public void setTopicId(long topicId) {
this.topicId = topicId;
}
public String getTopicTitle() {
return topicTitle;
}
public void setTopicTitle(String topicTitle) {
this.topicTitle = topicTitle;
}
public String getTopicAuthor() {
return topicAuthor;
}
public void setTopicAuthor(String topicAuthor) {
this.topicAuthor = topicAuthor;
}
public Topics(long topicId, String topicTitle, String topicAuthor) {
super();
this.topicId = topicId;
this.topicTitle = topicTitle;
this.topicAuthor = topicAuthor;
}
}
Following is the Junit class I have written but courseRepository is getting initialized to NULL and hence I am getting NullPointerException.
public class CourseServiceTest {
#Mock
private CourseRepository courseRepository;
#InjectMocks
private CourseService courseService;
Topics topics;
#Mock
private Iterable<Topics> topicsList;
#Before
public void setUp() {
MockitoAnnotations.initMocks(CourseServiceTest.class);
}
#Test
public void test_Get_Topic_Details() {
List<Topics> topics = new ArrayList<Topics>();
Mockito.when(courseRepository.findAll()).thenReturn(topics);
boolean result=courseService.getAllTopics();
assertTrue(result);
}
}
Change the setUp() method to:
#Before
public void setUp() {
MockitoAnnotations.initMocks(this);
}
Probably you are dealing with some problem on the framework to make the mocked class be injected by the framework.
I recommend to use Constructor Injection, so you don't need to rely on the reflection and #Inject/#Mock annotations to make this work:
#Service
public class CourseService {
private final CourseRepository courseRepository;
// #Autowired annotation is optional when using constructor injection
CourseService (CourseRepository courseRepository) {
this.courseRepository = courseRepository;
}
// .... code
}
The test:
#Test
public void test_Get_Topic_Details() {
List<Topics> topics = new ArrayList<Topics>();
Mockito.when(courseRepository.findAll()).thenReturn(topics);
CourseService courseService = new CourseService(courseRepository);
boolean result = courseService.getAllTopics();
assertTrue(result);
}
I have a custom Hibernate Validator for my entities. One of my validators uses an Autowired Spring #Repository. The application works fine and my repository is Autowired successfully on my validator.
The problem is i can't find a way to test my validator, cause i can't inject my repository inside it.
Person.class:
#Entity
#Table(schema = "dbo", name = "Person")
#PersonNameMustBeUnique
public class Person {
#Id
#GeneratedValue
#Column(name = "id", unique = true, nullable = false)
private Integer id;
#Column()
#NotBlank()
private String name;
//getters and setters
//...
}
PersonNameMustBeUnique.class
#Target({ TYPE, ANNOTATION_TYPE })
#Retention(RUNTIME)
#Constraint(validatedBy = { PersonNameMustBeUniqueValidator.class })
#Documented
public #interface PersonNameMustBeUnique{
String message() default "";
Class<?>[] groups() default {};
Class<? extends javax.validation.Payload>[] payload() default {};
}
The validator:
public class PersonNameMustBeUniqueValidatorimplements ConstraintValidator<PersonNameMustBeUnique, Person> {
#Autowired
private PersonRepository repository;
#Override
public void initialize(PersonNameMustBeUnique constraintAnnotation) { }
#Override
public boolean isValid(Person entidade, ConstraintValidatorContext context) {
if ( entidade == null ) {
return true;
}
context.disableDefaultConstraintViolation();
boolean isValid = nameMustBeUnique(entidade, context);
return isValid;
}
private boolean nameMustBeUnique(Person entidade, ConstraintValidatorContext context) {
//CALL REPOSITORY TO CHECK IF THE NAME IS UNIQUE
//ADD errors if not unique...
}
}
And the context file has a validator bean:
<bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean"/>
Again, it works fine, but i don't know how to test it.
My test file is:
#RunWith(MockitoJUnitRunner.class)
public class PersonTest {
Person e;
static Validator validator;
#BeforeClass
public static void setUpClass() {
ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
validator = factory.getValidator();
}
#Test
public void name__must_not_be_null() {
e = new Person();
e.setName(null);
Set<ConstraintViolation<Person>> violations = validator.validate(e);
assertViolacao(violations, "name", "Name must not be null");
}
}
I was facing very similar problem: How to write pure unit test of custom validator wich has autowired configuration bean?
I could manage to solve it by following code (inspired by this answer of user abhishekrvce).
This is pure unit test of custom validator with #Autowired configuration bean, which reads the data from configuration file (not showed in code).
#Import({MyValidator.class})
#ContextConfiguration(classes = MyConfiguration.class, initializers = ConfigFileApplicationContextInitializer.class)
class MyValidatorTest {
private LocalValidatorFactoryBean validator;
#Autowired
private ConfigurableApplicationContext applicationContext;
#BeforeEach
void initialize() {
SpringConstraintValidatorFactory springConstraintValidatorFactory
= new SpringConstraintValidatorFactory(
applicationContext.getAutowireCapableBeanFactory());
validator = new LocalValidatorFactoryBean();
validator.setConstraintValidatorFactory(springConstraintValidatorFactory);
validator.setApplicationContext(applicationContext);
validator.afterPropertiesSet();
}
#Test
void isValid()
{
Set<ConstraintViolation<MyObject>> constraintViolations = validator
.validate(myObjectInstance);
assertThat(constraintViolations).hasSize(1);
}
}
U can add the following bean to your Spring Context in the test:
#RunWith(SpringRunner.class)
#Import(LocalValidatorFactoryBean.class)
public class PersonTest {
#Autowired
private Validator validator;
{
validator.validate(new Person());
}
...
}
On #BeforeClass:
#BeforeClass
public static void setUpClass() {
ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
validator = factory.getValidator();
}
And in your test you need to replace the beans with your mocked bean:
myValidator.initialize(null);
BeanValidatorTestUtils.replaceValidatorInContext(validator, usuarioValidoValidator, e);
The class that do all the magic:
public class BeanValidatorTestUtils {
#SuppressWarnings({ "rawtypes", "unchecked" })
public static <A extends Annotation, E> void replaceValidatorInContext(Validator validator,
final ConstraintValidator<A, ?> validatorInstance,
E instanceToBeValidated) {
final Class<A> anotacaoDoValidador = (Class<A>)
((ParameterizedType) validatorInstance.getClass().getGenericInterfaces()[0])
.getActualTypeArguments()[0];
ValidationContextBuilder valCtxBuilder = ReflectionTestUtils.<ValidationContextBuilder>invokeMethod(validator,
"getValidationContext");
ValidationContext<E> validationContext = valCtxBuilder.forValidate(instanceToBeValidated);
ConstraintValidatorManager constraintValidatorManager = validationContext.getConstraintValidatorManager();
final ConcurrentHashMap nonSpyHashMap = new ConcurrentHashMap();
ConcurrentHashMap spyHashMap = spy(nonSpyHashMap);
doAnswer(new Answer<Object>() {
#Override public Object answer(InvocationOnMock invocation) throws Throwable {
Object key = invocation.getArguments()[0];
Object keyAnnotation = ReflectionTestUtils.getField(key, "annotation");
if (anotacaoDoValidador.isInstance(keyAnnotation)) {
return validatorInstance;
}
return nonSpyHashMap.get(key);
}
}).when(spyHashMap).get(any());
ReflectionTestUtils.setField(constraintValidatorManager, "constraintValidatorCache", spyHashMap);
}
}
We also faced the similar problem where #Autowiring was failing (not initialised) in ConstrainValidator Class. Our ConstraintValidator Implemented class was using a value which supposed to be read from the application.yml file. Below solution helped us as this is using a pure spring scope. Hope this helps, with proper SpringJunit4ClassRunner.
import org.springframework.test.context.web.WebAppConfiguration;
import org.springframework.validation.beanvalidation.LocalValidatorFactoryBean;
import org.springframework.validation.beanvalidation.SpringConstraintValidatorFactory;
import org.springframework.web.context.WebApplicationContext;
#WebAppConfiguration
#ContextConfiguration(classes = {ApplicationConfig.class})
#RunWith(SpringJUnit4ClassRunner.class)
#TestPropertySource(properties = {
"spring.someConfigValue.InApplicationYaml=Value1",
})
public class MyTest {
#Autowired
private WebApplicationContext webApplicationContext;
LocalValidatorFactoryBean validator;
#Before
public void setup() {
SpringConstraintValidatorFactory springConstraintValidatorFactory
= new SpringConstraintValidatorFactory(webApplicationContext.getAutowireCapableBeanFactory());
validator = new LocalValidatorFactoryBean();
validator.setConstraintValidatorFactory(springConstraintValidatorFactory);
validator.setApplicationContext(webApplicationContext);
validator.afterPropertiesSet();
}
#Test
public void should_have_no_violations_for_all_valid_fields() {
Set<ConstraintViolation<PojoClassWhichHaveConstraintValidationAnnotation>> violations = validator.validate(pojoClassObjectWhichHaveConstraintValidationAnnotation);
assertTrue(violations.isEmpty());
}
}
#Configuration
public class ApplicationConfig {
#Value("${spring.someConfigValue.InApplicationYaml=Value1}")
public String configValueToBeReadFromApplicationYamlFile;
}
Recently I had the same problem with my custom validator. I needed to validate a model being passed to a controller's method (method level validation). The validator invoked but the dependencies (#Autowired) could not be injected. It took me some days searching and debugging the whole process. Finally, I could make it work. I hope my experience save some time for others with the same problem. Here is my solution:
Having a jsr-303 custom validator like this:
#Retention(RetentionPolicy.RUNTIME)
#Target({ ElementType.FIELD,
ElementType.PARAMETER,
ElementType.TYPE,
ElementType.METHOD,
ElementType.LOCAL_VARIABLE,
ElementType.CONSTRUCTOR,
ElementType.TYPE_PARAMETER,
ElementType.TYPE_USE })
#Constraint(validatedBy = SampleValidator.class)
public #interface ValidSample {
String message() default "Default sample validation error";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
public class SampleValidator implements ConstraintValidator<ValidSample, SampleModel> {
#Autowired
private SampleService service;
public void initialize(ValidSample constraintAnnotation) {
//init
}
public boolean isValid(SampleModel sample, ConstraintValidatorContext context) {
service.doSomething();
return true;
}
}
You should configure spring test like this:
#ComponentScan(basePackages = { "your base packages" })
#Configurable
#EnableWebMvc
class SpringTestConfig {
#Autowired
private WebApplicationContext wac;
#Bean
public Validator validator() {
SpringConstraintValidatorFactory scvf = new SpringConstraintValidatorFactory(wac.getAutowireCapableBeanFactory());
LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
validator.setConstraintValidatorFactory(scvf);
validator.setApplicationContext(wac);
validator.afterPropertiesSet();
return validator;
}
#Bean
public MethodValidationPostProcessor mvpp() {
MethodValidationPostProcessor mvpp = new MethodValidationPostProcessor();
mvpp.setValidatorFactory((ValidatorFactory) validator());
return mvpp;
}
#Bean
SampleService sampleService() {
return Mockito.mock(SampleService.class);
}
}
#WebAppConfiguration
#ContextConfiguration(classes = { SpringTestConfig.class, AnotherConfig.class })
public class ASampleSpringTest extends AbstractTestNGSpringContextTests {
#Autowired
private WebApplicationContext wac;
private MockMvc mockMvc;
#BeforeClass
public void setUp() throws Exception {
MockitoAnnotations.initMocks(this);
mockMvc = MockMvcBuilders.webAppContextSetup(wac)
.build();
}
#Test
public void testSomeMethodInvokingCustomValidation(){
// test implementation
// for example:
mockMvc.perform(post("/url/mapped/to/controller")
.accept(MediaType.APPLICATION_JSON_UTF8)
.contentType(MediaType.APPLICATION_JSON_UTF8)
.content(json))
.andExpect(status().isOk());
}
}
Note that, here I am using testng, but you can use JUnit 4. The whole configuration would be the same except that you would run the test with #RunWith(SpringJUnit4ClassRunner.class) and do not extend the AbstractTestNGSpringContextTests.
Now, #ValidSample can be used in places mentioned in #Target() of the custom annotation.
Attention: If you are going to use the #ValidSample annotation on method level (like validating method arguments), then you should put class level annotation #Validated on the class where its method is using your annotation, for example on a controller or on a service class.
A solution with JUnit4 and Mockito:
#Import(LocalValidatorFactoryBean.class)
#RunWith(SpringRunner.class)
public class MyCustomValidatorTest {
#Autowired
private Validator validator;
#MockBean
private PersonRepository repository;
#Test
public void name_must_not_be_null() {
// given
when(repository.findByName(any())).thenReturn(Collection.emptyList());
Person person = new Person();
person.setName(null);
// when
Set<ConstraintViolation<Person>> violations = validator.validate(person);
// then
assertViolation(violations, "name", "Name must not be null");
}
}
You can test the validator stand alone and use reflection for inject the autowired attribute.
Constraint annotation:
#Target({ElementType.FIELD })
#Retention(RetentionPolicy.RUNTIME)
#Constraint(validatedBy = EmailAlreadyExistsValidator.class)
public #interface EmailAlreadyExists {
String message() default "Email already exists in the database";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
Validator:
public class EmailAlreadyExistsValidator implements
ConstraintValidator<EmailAlreadyExists, String> {
#Autowired
private UserRepository repository;
#Override
public void initialize(EmailAlreadyExists constraintAnnotation) {}
public boolean isValid(String email, ConstraintValidatorContext context) {
Optional<User> opUser = repository.findByEmail(email);
return (opUser.isEmpty());
}
}
Unit Test (ReflectionTestUtils do the magic):
public class EmailAlreadyExistsValidatorTest {
#Mock
private EmailAlreadyExists emailAlreadyExists;
#Mock
private ConstraintValidatorContext constraintValidatorContext;
#Mock
private UserRepository repository;
private EmailAlreadyExistsValidator validator;
#BeforeEach
public void beforeEach() {
MockitoAnnotations.openMocks(this);
validator = new EmailAlreadyExistsValidator();
validator.initialize(emailAlreadyExists);
ReflectionTestUtils.setField(validator, "repository", repository);
}
#Test
#DisplayName("Given an user with existent email then validation must fail")
public void isValid_existentPassword_mustFail() {
final String existentEmail = "testuser#test.com";
User savedUser = new User("1213443455",
"Test User",
existentEmail,
"12345",
new Date());
Optional<User> opUser = Optional.of(savedUser);
when(repository.findByEmail(anyString())).thenReturn(opUser);
assertFalse(validator.isValid(existentEmail,constraintValidatorContext));
}
}
It might be a bit late but I faced the same issue lately so I'll post how I solved the problem, as this could help other people.
The problem is basically that Hibernate's standard Validator implementation that you get by calling Validation.buildDefaultValidatorFactory().getValidator() does not know anything about Spring's application context so it cannot inject dependencies in your custom constraint validators.
In a Spring application the implementation of both the Validator and the ValidatorFactory interface is the class LocalValidatorFactoryBean, which can delegate to the ApplicationContext to instantiate constraint validators with dependencies injected.
What you need to do is
Instantiate your constraint validators with their (mocked, I presume) dependencies
Create your own ValidatorFactory that holds all the constraint validators from bulletpoint 1
Instantiate your Validator from such factory
This is the custom validator factory
public class CustomLocalValidatorFactoryBean extends LocalValidatorFactoryBean {
private final List<ConstraintValidator<?, ?>> customConstraintValidators;
public CustomLocalValidatorFactoryBean(List<ConstraintValidator<?, ?>> customConstraintValidators) {
this.customConstraintValidators = customConstraintValidators;
setProviderClass(HibernateValidator.class);
afterPropertiesSet();
}
#Override
protected void postProcessConfiguration(Configuration<?> configuration) {
super.postProcessConfiguration(configuration);
ConstraintValidatorFactory defaultConstraintValidatorFactory =
configuration.getDefaultConstraintValidatorFactory();
configuration.constraintValidatorFactory(
new ConstraintValidatorFactory() {
#Override
public <T extends ConstraintValidator<?, ?>> T getInstance(Class<T> key) {
for (ConstraintValidator<?, ?> constraintValidator : customConstraintValidators) {
if (key.equals(constraintValidator.getClass())) //noinspection unchecked
return (T) constraintValidator;
}
return defaultConstraintValidatorFactory.getInstance(key);
}
#Override
public void releaseInstance(ConstraintValidator<?, ?> instance) {
defaultConstraintValidatorFactory
.releaseInstance(instance);
}
}
);
}
}
then in your test class you'd just do something like this:
class MyTestSuite {
private final PersonRepository mockPersonRepository = Mockito.mock(PersonRepository.class);
private final List<ConstraintValidator<?,?>> customConstraintValidators =
Collections.singletonList(new PersonNameMustBeUniqueValidator(mockPersonRepository));
private final ValidatorFactory customValidatorFactory =
new CustomLocalValidatorFactoryBean(customConstraintValidators);
private final Validator validator = customValidatorFactory.getValidator();
#Test
void myTestCase() {
// mock the dependency: Mockito.when(mockPersonRepository...)
Person p = new Person();
//setters omitted
Set<ConstraintViolation<?>> violations = validator.validate(p);
//assertions on the set of constraint violations
}
}
Hope that helps. You can check out this post of mine for more details: https://codemadeclear.com/index.php/2021/01/26/how-to-mock-dependencies-when-unit-testing-custom-validators/
I've implemented by overriding default Hibernate ConstraintValidatorFactory in my UnitTests
LocalValidatorFactoryBean localValidatorFactory = new LocalValidatorFactoryBean();
localValidatorFactory.setProviderClass(HibernateValidator.class);
localValidatorFactory.setConstraintValidatorFactory(new ConstraintValidatorFactoryImpl() {
#Override
public <T extends ConstraintValidator<?, ?>> T getInstance(Class<T> arg0) {
T ret = super.getInstance(arg0);
if (ret instanceof UniqueEmailValidator) {
((UniqueEmailValidator) ret).setUserService(userService);
}
return ret;
}
});
localValidatorFactory.afterPropertiesSet();
Spring Boot 2 allows to inject Bean in custom Validator without any fuss.The Spring framework automatically detects all classes which implement the ConstraintValidator interface, instantiate them, and wire all dependencies.
I had Similar problem , this is how i have implemented.
Step 1 Interface
#Documented
#Constraint(validatedBy = UniqueFieldValidator.class)
#Target({ ElementType.METHOD,ElementType.ANNOTATION_TYPE,ElementType.PARAMETER })
#Retention(RetentionPolicy.RUNTIME)
public #interface UniqueField {
String message() default "Duplicate Name";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
Step 2 Validator
public class UniqueFieldValidator implements ConstraintValidator<UniqueField, Person> {
#Autowired
PersionList personRepository;
private static final Logger log = LoggerFactory.getLogger(PersonRepository.class);
#Override
public boolean isValid(Person object, ConstraintValidatorContext context) {
log.info("Validating Person for Duplicate {}",object);
return personRepository.isPresent(object);
}
}
Usage
#Component
#Validated
public class PersonService {
#Autowired
PersionList personRepository;
public void addPerson(#UniqueField Person person) {
personRepository.add(person);
}
}