how to mock super class that has injected dependencies

Question

I have a project that uses Spring MVC. I'm trying to write unit tests for the service module, which is in the architecture of the project. All service classes extend from super class named "BaseService". BaseService is like this:

public abstract class BaseService {

private static final Logger  logger = LoggerFactory.getLogger(BaseService.class);

@Autowired(required = true)
private HttpServletRequest   request;

@Autowired
private ReloadableResourceBundleMessageSource messageSource;

/*
 * Injecting Mapper
 */
@Resource
private Mapper mapper;
...

public <T extends BaseBVO, S extends BaseVO> T voToBvo (S vo, Class<?     extends BaseBVO> bvoClass) {

    if (vo != null)
    {
        return (T) mapper.map(vo , bvoClass);
    }
    else
    {
        return null;
    }
}

now I have a method in the service module that use the method:

"voToBvo (S vo, Class<?     extends BaseBVO> bvoClass")

like this:

public List<AdcOptionBVO> findOptionByAyantDroitIdAndProduitId (Long idAyantDroit, String idProduit) {

    ....

        list = listVoToBvo(adcList , AdcOptionBVO.class);
        logger.info("Returning List of ayrp count= {}" , list.size());

    return list;
}

My test is like this:

@RunWith(MockitoJUnitRunner.class)
public class AdcServiceImplTest{

@Mock
private Mapper mapper;

    @Test
public void shouldSuccessFindOptionByAyantDroitIdandProduitId() {
    //Given
    List<AdcVO> adcVOList = new ArrayList<>();
    adcVOList.add(new AdcVO());

    List<AdcOptionBVO> listAdcOptionBVO = new ArrayList<>();
    listAdcOptionBVO.add(new AdcOptionBVO());

    List<BaseBVO> baseBVOs = new ArrayList<>();

    //When
    when(repository
            .finAdcByOptionOrderByRUAndPrio(anyLong(), anyString())).thenReturn(adcVOList);

    when(baseService.listVoToBvo(adcVOList,  AdcOptionBVO.class)).thenReturn(baseBVOs);


    //Then
    assertEquals(adcService
            .findOptionByAyantDroitIdAndProduitId(anyLong(), anyString()).size(), adcVOList.size());

}
}

I get a java.lang.NullPointerException in BaseService.java when calling the mapper.

 @Resource
 private Mapper mapper;

the mapper is null!

I want to mock the method:

listVoToBvo(adcList , AdcOptionBVO.class);

Please help.

Answer 1

I will suggest you, first to change in your BaseService file. Change the way of writing @Autowired as follows

private HttpServletRequest request;  
@Autowired(required = true)
public void setSpellChecker( HttpServletRequest request ){
   this.request = request;
} 

@Autowired
private ReloadableResourceBundleMessageSource messageSource;
public void setSpellChecker( ReloadableResourceBundleMessageSource messageSource ){
   this.messageSource = messageSource;
}

And when you will do that, now you can easily achieve test-cases with dependency.