java - Criteria Query Mockito 单元测试 - NullPointerException

Question

我有一个方法，我正在尝试使用mockito 进行测试。以下是我正在尝试测试的方法。当我运行测试时，出现空指针异常。我正在 mock Root，但在 accountEntity.get 处我得到了空指针。我在这里缺少什么？

     public List<AccountEntity> createCriteriaQuery(final List<String> accountIdList,
                    final MultiValueMap<String, String> allRequestParams) {

                final CriteriaBuilder cb = entityManager.getCriteriaBuilder();           
                final CriteriaQuery<AccountEntity> cq = cb.createQuery(AccountEntity.class);
                final Root<AccountEntity> accountEntity = cq.from(AccountEntity.class);

                final Join<AccountEntity, PlanEntity> account = accountEntity.join(AccountEntity_.planEntity);

                final List<Predicate> predicates = new ArrayList<Predicate>();

        //Getting null pointer at the below call.        

**predicates.add(accountEntity.get(AccountEntity_.id).in(accountIdList));**

    /*remaining code here/

下面是我的测试。

@InjectMocks
private AccountsDAO                         accountsDao;
@Mock
EntityManagerFactory                        entityManagerFactory;
@Mock
EntityManager                               entityManager;
@Mock
CriteriaBuilder                             cb;
@Mock
CriteriaQuery<AccountEntity>                cq;
@Mock
Root<AccountEntity>                         rootAccountEntity;
    @Test
        public void canGetAllAccountsInfo() {
        when(entityManagerFactory.createEntityManager()).thenReturn(entityManager);
        when(entityManager.getCriteriaBuilder()).thenReturn(cb); when(cb.createQuery(AccountEntity.class)).thenReturn(cq);
        when(cq.from(AccountEntity.class)).thenReturn(rootAccountEntity);
//Null pointer in the actual method call
            accountEntityList = accountsDao.createCriteriaQuery(accounIdList, allRequestParams);        
          }

Answer 1

我猜 accountEntity.get(AccountEntity_.id) 解析为 null 因为您没有添加任何 when(...).thenReturn( ...) 用于播放中的模拟 accountEntity 对象。