mocking - 如何验证链式方法调用？

Question

我正在为我项目的 DAO 类编写测试。但是，当我使用 Mockito 的 verify() 方法时，它会抛出 NullPointerException，因为 createQuery() 方法返回 null。我该如何解决这个问题？

@Mock(answer = Answers.RETURNS_DEEP_STUBS)
private EntityManager entityManagerMock;

@InjectMocks
private TaksitPlanSatiriDao taksitPlanSatiriDao = new TaksitPlanSatiriDaoJpa();

@Before
public void setUp() {
    taksitPlanSatiriEntity = new TaksitPlanSatiriEntity();
}
@Test
public void shouldUpdateWhenGuncelleCalledWithTaksitPlanSatiriEntity() {
    taksitPlanSatiriDao.guncelle(taksitPlanSatiriEntity);
    Mockito.verify(entityManagerMock).createQuery(ArgumentMatchers.anyString()).executeUpdate();
}

Answer 1

尝试:

Mockito.verify(entityManagerMock.createQuery(ArgumentMatchers.anyString())).executeUpdate();

这基于“Deep Stubs”文档:

https://static.javadoc.io/org.mockito/mockito-core/2.28.2/org/mockito/Mockito.html#RETURNS_DEEP_STUBS