Spring data and junit

问题

i have a problem where i want to test spring data with junit. I use spring data jpa with junit 4 :

this is my test class

 @ContextConfiguration(locations={"classpath*:applicationContext.xml"})
    @Transactional
    @RunWith(SpringJUnit4ClassRunner.class)
    public class EquipementServiceTest1 {

       @Autowired
        IEquipementService equipmentservice;
        @Before
        public void setUp() throws Exception {
            equipmentservice=new EquipementService();
        }

        @Test
        public void testValidateEquipement() {
           equipementEntity e =new equipementEntity();
           e.setCode("10");
           e.setLibelle("yyyy");
           equipmentservice.validateEquipement(e);
        }

        @Test
        public void testGetListEquipement() {
            List<equipementEntity> list=new ArrayList<equipementEntity>();
            list=   equipmentservice.getListEquipement();
                assertEquals(list.size(), 2);`enter code here`
        }

        @Service
    public class EquipementService implements IEquipementService {

        @Autowired
        EquipementRepository equipementRepository;`enter code here

        @Override
        public List<equipementEntity> getListEquipement() {
            return equipementRepository.findAll();
        }

i have a null pointer exception thank you very much

回答1:

You have a lot of stuff going on here. You autowire EquipmentService but you don't specify the configuration, so the service is not being autowired. Even if it was, you reset it in the setUp method. The new equipmentservice does not have repository set, so NullPointerException is probably thrown at the point equipmentservice tries to call repository.

This is pretty easy to resolve using @ContextConfiguration and Mockito mock objects ( I am assuming repository is autowired)

1. For you test class add @ContextConfiguration annontation.
2. Add inner static configuration class to your test

3. In the configuration make repository a mock object

   @Transactional
   @RunWith(SpringJUnit4ClassRunner.class)
   @ContextConfiguration
   public class EquipementServiceTest1 {
          @Autowired
           IEquipementService equipmentservice;
           @Before
           public void setUp() throws Exception {
              //remove this 
              // equipmentservice=new EquipementService();
           }
   
           @Test
           public void testValidateEquipement() {
              equipementEntity e =new equipementEntity();
              e.setCode("10");
              e.setLibelle("yyyy");
              equipmentservice.validateEquipement(e);
           }
   
           @Test
           public void testGetListEquipement() {
               List<equipementEntity> list=new ArrayList<equipementEntity>();
               list=   equipmentservice.getListEquipement();
                   assertEquals(list.size(), 2);`enter code here`
           }
   
           @Service
       public class EquipementService implements IEquipementService {
   
           @Autowired
           EquipementRepository equipementRepository;`enter code here
   
           @Override
           public List<equipementEntity> getListEquipement() {
               return equipementRepository.findAll();
           }
      }
   @Configuration
   public static class Config {
   @Bean
   public IEquipementService equipmentservice {
      return new equipmentService();
   }
   
   @Bean
   public EquipmentRepository equipmentRepository {
     return Mockito.mock(EquimentRepository.class);
   }
   
   }
   

This obviously has not been compiled. Also equipmentRepository is a mock, so the call to getListEquipment will return empty List. If you want it to return something you can specify it using Mockito.when method for example. Please not, that this is a Unit Test and it is testing EquipmentService, not EquipmentRepository. If you want to test the functionality of EquipmentRepository you would need to create another Unit test and configure it accordingly.

来源：https://stackoverflow.com/questions/32978956/spring-data-and-junit