I am trying to mock a call baseUtils.getIdentificationType(id.getType().getName()) but the instance baseUtils is always null and hence throws NPE when that method is called. I have mocked baseUtils and using Mockito.initMocks(this)
Base class
class Base {
@Inject
protected BaseUtils baseUtils;
protected void populateIdentification(Person person, final List<Id> issuedIds) {
List<Identification> identificationList = new ArrayList<>();
if (issuedIds != null && issuedIds.size() > 0) {
for (Id id : issuedIds) {
Identification identification = new Identification();
// BELOW CALL TO MOCK BUT baseUtils returns null hence NPE in the test
String idType = baseUtils.getIdentificationType(id.getType().getName());
if (idType != null) {
identification.setType(idType);
} else {
identification.setTypeOther(id.getType().getName());
}
identification.setNumber(issuedId.getId());
if (issuedId.getCountryCode() != null) {
CountryCodeEnum codeEnum = CountryCodeEnum.valueOf(govtIssuedId.getCountryCode());
identification.setCountry(codeEnum.getName());
}
identificationList.add(identification);
}
person.setIdentificationList(identificationList);
}
}
}
Child.java
class Child extends Base {
...
}
BaseUtils.java
@Component
public class BaseUtils {
private Map<String, String> idToIdType;
public BaseUtils() {
idToIdType = new HashMap<>();
idToIdType.put("ID1", "A");
idToIdType.put("ID2", "B");
idToIdType.put("ID3", "C");
}
public String getIdentificationType(String documentType) {
if (idToIdType.containsKey(documentType)) {
return idToIdType.get(documentType);
}
return null;
}
}
TEST
@RunWith(MockitoJUnitRunner.class)
public class ChildTest {
@Mock
private BaseUtils baseUtils;
@InjectMocks
Child child = new Child();
@Before
public void init() {
MockitoAnnotations.initMocks(this);
}
@Test
public void populateIdentificationTest() {
Child child = new Child();
Person person = new Person();
person.setId("ID_123456");
UserData userData = createUserData();
List<IssuedId> issuedIds = userData.getIssuedIds();
doReturn("ABC").when(baseUtils).getIdentificationType(anyString()); //MOCKED CALL
child.populateIdentification(person, issuedIds);
assertNotNull(person.getIdentificationList());
assertNotNull(person.getIdentificationList().get(0).getNumber());
}
}
I have reviewed other questions and this is how its done there so not sure what am I not following. Some help will be really appreciated 🙂
Answer
I think the problem is here:
You use @InjectMocks Child child = new Child(); to inject your BaseUtils Mock. But in your @Test you create a new instance of Child. Do not do that. Use your Child instance you created in @InjectMocks Child child = new Child();.