Как протестировать анонимные методы с помощью JUnit или Mockito?

У меня есть простой класс, но с анонимным блоком кода. Мне нужно покрыть этот класс тестами.

public class CleanerTask {

    private final Logger log = LoggerFactory.getLogger(getClass());
    DataWarehouseMessageDao dwMessageDao;
    int cleanerDelay = 0;
    TransactionTemplate template;

    public CleanerTask(DataWarehouseMessageDao dwMessageDao, int cleanerDelay, TransactionTemplate template) {
        this.dwMessageDao = dwMessageDao;
        this.cleanerDelay = cleanerDelay;
        this.template = template;
    }

    public void clean() {
        log.info("Cleaner started");
        final Date olderThan = new Date();
        olderThan.setDate(olderThan.getDate() + cleanerDelay);
        template.execute(new TransactionCallback<Date>() {
            @Override
            public Date doInTransaction(TransactionStatus transactionStatus) {
                dwMessageDao.deleteAllByStatusAndDate(DataWarehouseMessageStatus.SAVED.getValue(), olderThan);
                return olderThan;
            }
        });
    }
}

И тест:

@RunWith(MockitoJUnitRunner.class)
public class CleanerTaskTest {

    final static int CLEANER_DELAY = 5;

    @Mock
    DataWarehouseMessageDao dao;

    @Mock
    TransactionTemplate template;

    CleanerTask cleanerTask;

    @Before
    public void setUp() throws Exception {
        cleanerTask = new CleanerTask(dao, CLEANER_DELAY, template);
    }

    @Test
    public void successfulScenario() {
        try {
            cleanerTask.clean();
            verify(template, times(1)).execute(isA(TransactionCallback.class));
            //that verify was not triggered    
            //verify(dao, times(1)).deleteAllByStatusAndDate(anyInt(), isA(Date.class));
        } catch (Exception e) {
            e.printStackTrace();
            fail("No exceptions must occur");
        }
    }
}

Commented line doesn't work. Log: Wanted but not invoked: dao.deleteAllByStatusAndDate( , isA(java.util.Date) ); -> at com.nxsystems.dw.publisher.handler.CleanerTaskTest.successfulScenario(CleanerTaskTest.java:52) Actually, there were zero interactions with this mock.

at com.nxsystems.dw.publisher.handler.CleanerTaskTest.successfulScenario(CleanerTaskTest.java:52) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) at org.junit.runners.ParentRunner.run(ParentRunner.java:236) at org.mockito.internal.runners.JUnit45AndHigherRunnerImpl.run(JUnit45AndHigherRunnerImpl.java:37) at org.mockito.runners.MockitoJUnitRunner.run(MockitoJUnitRunner.java:62) at org.junit.runner.JUnitCore.run(JUnitCore.java:157) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:62)

Также, когда этот тетс запускается, отладчик не заходит внутрь анонимного блока. Итак, как заставить Mockito войти в анонимный блок?