Mockito -mocking implementation class - junit

Question

Hi i am trying to mock dao layer
my application has some class hire achy like this Application->parser->dao(interface)->dao implementation class
my problem is when i am mocking dao interface or daoimp class using mockito
in my test case they are not working simply test case going to db how to do make our test case to use these mocked objects
#RunWith(MockitoJUnitRunner.class)
public class CsvDataLoadServiceImplTest {
#Mock private MeteringDataDao meteringDataDao;
List<Object> persistedList;
Object meteringData;
List<Object> s=new ArrayList<Object>();
#SuppressWarnings({ "rawtypes", "unchecked" })
#Before public void setup(){
Mockito.doAnswer(new Answer<List<Object>>() {
#Override
public List<Object> answer(InvocationOnMock invocation) throws Throwable {
Object[] args = invocation.getArguments();
System.out.println("persist all");
if(persistedList == null){
persistedList = (List)args[0];
}
else
persistedList.addAll((List)args[0]);
return null;
}}).when(meteringDataDao).persistAll(anyList());
Mockito.doAnswer(new Answer<Object>() {
#Override
public Object answer(InvocationOnMock invocation) {
Object[] args = invocation.getArguments();
if(meteringData == null)
meteringData = (List)args[0];
return true;
}}).when(meteringDataDao).persist(anyObject());
}
#After public void tearDown(){
persistedList = null;
meteringData = null;
}
#Test
public void testDataAccuricy(){
CsvDataLoadService csvDataLoadService =new CsvDataLoadServiceImpl();
csvDataLoadService.loadRackspaceCsvData();
}
}

Answer 1

CsvDataLoadService csvDataLoadService = new CsvDataLoadServiceImpl();
You're constructing an instance of the service, but this instance doesn't use the DAO you mocked. It uses another one. You need something like
CsvDataLoadService csvDataLoadService =
new CsvDataLoadServiceImpl(meteringDataDao);

Answer 2

Your question is a little badly phrased, so sorry if I appear to have misunderstood you.
#JBNizet answer is correct, you're not using the mocked object, but rather than changing the code for a test you should simply change the test. This is always a best practice when writing your tests.
You haven't assigned the mocked object to the service, so I'm assuming that the MeteringDataDao object is actually instantiated inside the class you're attempting to test?
If so, then you will need something more powerful than Mockito (Unless you want to reproduce the capabilities of a more powerful already existing library). I would suggest PowerMockito, which I have used in the past for something exactly like this.
A good example of using powermockito to mock the constructor of a class can be seen in a few answers on SO already, so I'll just link to them rather than try and re-explain their already clear answers:
Powermock constructor mocking has no effect on the instantiated object
mockito mock a constructor with parameter