How to verify an internal method call using Powermock?

Question

I am trying to use PowerMockito to test a save method by verifying an internal audit() method call. This internal call is made by auditor object which is being instantiated in an init() method of the class. As it is not injected I will not be able to mock it directly. When I used Mockito to verify it always said "There were zero interaction with the mock". Question:How exactly do I test the save feature? Kindly help!

public class DaoImpl implements Dao{
private Auditor auditor;

@InjectValue
private ObjectLoader loader;

@InjectValue
private ConfigurationProvider confProvider;

@PostConstruct
public void init() {
    //Mock this object instantiation and verify audit is called once
    auditor = new SyncAuditor(confProvider.getClientConfiguration(), new EventRegProvider());
}

@Override
public void save(final AuditEvt auditEvt) {
  final AuditedEvent auditedEvent = builder.build();
  auditor.audit(auditedEvent); 
 }

Test :

@RunWith(PowerMockRunner.class)
@PrepareForTest({ DaoImplTest.class })
@PowerMockIgnore("javax.management.*")
public class DaoImplTest extends PowerMockito {

@InjectMocks
private DaoImpl dataAccess;

@Mock
private SynchAuditor auditorMock;
 @Before
public void setUp() throws Exception {
    loader = ObjectLoader.init("JUNIT");
    loader.bind(ConfigurationProvider.class, configurationProviderMock);
    dataAccess = loader.newInstance(DaoImpl.class);
}

@After
public void tearDown() {
    loader.release(dataAccess);
    ConnectionMgr.disconnect("JUNIT");
}

@Test
public void testSaveAuditEvent() throws Exception { 
     PowerMockito.whenNew(SynchAuditor.class).
     withArguments(Matchers.any(ClientConfiguration.class), Matchers.any(EventRegProvider.class)).thenReturn(this.auditorMock);
     final AuditEvent event = AuditEvent.from(null, "principal", UUID.randomUUID().toString(), "randomText",
            new AuditEvtDefn((long) 522, "234242", "234242fdgd", true), SUCCESS, null, new GregorianCalendar());
     dataAccess.save(event);
     Mockito.verify(auditorMock, times(1)).audit(Matchers.any(AuditedEvent.class));
}

Even PowerMockito.verifyNew says there were zero interaction PowerMockito.verifyNew(SynchronousAuditor.class,times(1)).withArguments(Matchers.any(AuditorClientConfiguration.class),Matchers.any(EventRegistrationProvider.class));

Answer 1

So, I figured out that java reflection will help in such a situation. You will have to get hold onto the real object and then set mocked object to it.

final Field privateAuditorField = DaoImpl.class.getDeclaredField("auditor");
privateAuditorField.setAccessible(true);
privateAuditorField.set(dataAccess, auditorMock);

Now verify will run sucessfully.

Mockito.verify(auditorMock, Mockito.times(1)).audit(Matchers.any(AuditedEvent.class));