Mockito + Spring + @PostConstruct，mock初始化错误，为什么会调用@PostConstruct?

2022-01-14 00:00:00 unit-testing spring mockito java spring-boot

我有这样的设置:

Bean类:

private final Map<String, String> configCache = new HashMap<>();
@PostConstruct
private void fillCache() {  (...) configCache.clear();}

TestConfig 类:

@Bean
@Order(Ordered.HIGHEST_PRECEDENCE)
@Primary
public Bean beanMock() {
    return Mockito.mock(Bean.class);
}

Test 类:哪个 @Autowires bean.

Test class: which @Autowires the bean.

似乎当 Mockito 在 TestConfig 中创建模拟时，它调用了 @PostConstruct ，而 @PostConstruct 又似乎在映射字段初始化之前被调用，因此它引发了异常.

It seems when Mockito is creating the mock in TestConfig, it calls @PostConstruct which in turn seems to be called before the map field is initialized so it throws an exception.

我的问题是:

  • 为什么 Mockito 调用 @PostConstruct?
  • 如何禁用 @PostConstruct 进行模拟?

显然调用是在 Spring 从 Config 的 @Bean 方法中重新调用 bean 之前的实例化之后完成的

Apparently the call is done after the instantiation just before Spring retrns the bean from a Config's @Bean method

推荐答案

Mockito 没有调用 @PostConstruct -- Spring 是.你说在你的测试中你使用了 @Autowired，这不是一个 Mockito 注释.

Mockito isn't calling @PostConstruct -- Spring is. You say that in your test you use @Autowired, which is not a Mockito annotation.

如果您打算使用 @Mock，您会发现 Mockito 不会调用您的 @PostConstruct 方法.

If you meant to use @Mock, you'll find that Mockito won't call your @PostConstruct method.

换句话说，像这样编写你的测试类:

In other words, write your test class like this:

@Mock Bean myBean;

@Before
public void before() {
    MockitoAnnotations.initMocks();
}

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