Unit testing: Call @PostConstruct after defining mocked behaviour

Question

I have two classes:

public MyService {
    @Autowired
    private MyDao myDao;     
    private List list; 

    @PostConstruct
    private void         


        

Answer 1

I have same kind of requirement in my project. where i need to set a string using @PostConstructor and I did not want to ran spring context or in other words I want simple mock. My requirement was follow:

public class MyService {

@Autowired
private SomeBean bean;

private String status;

@PostConstruct
private void init() {
    status = someBean.getStatus();
} 

}

Solution:

public class MyServiceTest(){

@InjectMocks
private MyService target;

@Mock
private SomeBean mockBean;

@Before
public void setUp() throws NoSuchMethodException,  InvocationTargetException, IllegalAccessException {

    MockitoAnnotations.initMocks(this);

    when(mockBean.getStatus()).thenReturn("http://test");

    //call post-constructor
    Method postConstruct =  MyService.class.getDeclaredMethod("init",null); // methodName,parameters
    postConstruct.setAccessible(true);
    postConstruct.invoke(target);
  }

}

Answer 2

MyDao sounds like it is an abstraction of an external system. Generally external systems shouldn't be called in @PostConstruct methods. Instead have your getItems() called by another method in MyService.

Mockito injections will take place after the Spring initiation at which point the mock isn't working as you see. You cannot delay the @PostConstruct. To beat this and have the load run automatically have MyService implement SmartLifecycle and call getItems() in start().