如何解决即使激活模拟,Mockito 模拟也会抛出 NPE
我正在尝试模拟调用 baseUtils.getIdentificationType(id.getType().getName())
,但实例 baseUtils
始终为 null,因此在调用该方法时会引发 NPE。我嘲笑了 baseUtils
并使用了 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());
}
}
我已经查看了其他问题,这是在那里完成的,所以不确定我没有关注什么。一些帮助将不胜感激:)
解决方法
我认为问题出在这里:
您使用 @InjectMocks Child child = new Child();
注入您的 BaseUtils
Mock。但是在您的 @Test
中,您创建了一个新的 Child
实例。不要那样做。使用您在 Child
中创建的 @InjectMocks Child child = new Child();
实例。
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