[英]How to abstract away java.time.Clock for testing purposes in Spring
I have a question with regards to the question Time dependent unit tests我对时间相关的单元测试问题有疑问
Let's say I build Spring application which contains service interface and its implementation假设我构建了包含服务接口及其实现的 Spring 应用程序
If I want to change clock in test, I would have to "pollute" production code and interface with eg setClock
method as follows:如果我想在测试中更改时钟,我将不得不“污染”生产代码和接口,例如
setClock
方法,如下所示:
public interface MyService {
void heavyBusinessLogic();
void setClock(Clock clock);
}
@Service
public class MyServiceImpl implements MyService {
private Clock clock = Clock.systemDefaultZone();
@Override
public void heavyBusinessLogic() {
if (LocalDate.now(clock)...) {
...
}
}
@Override
public void setClock(Clock clock) {
this.clock = clock;
}
}
In test, I can invoke, eg:在测试中,我可以调用,例如:
service.setClock(Clock.fixed(Instant.parse("2017-02-14T01:22:00Z"), ZoneOffset.UTC));
How can I abstract away such cross-cutting concern in Spring?我如何在 Spring 中抽象出这种横切关注点?
I want to stick with java.time.Clock (I don't want to use Joda)我想坚持使用 java.time.Clock(我不想使用 Joda)
Personally, I would simply add the clock in the constructor...就个人而言,我会简单地在构造函数中添加时钟......
public MyServiceImpl(Clock clock) {
this.clock = clock;
}
...and perhaps add a nice default constructor... ...也许添加一个不错的默认构造函数...
public MyServiceImpl() {
this(Clock.systemDefaultZone());
}
This way you can get the default thing via spring and create a custom clock version manually, for example in your tests.这样您就可以通过 spring 获取默认值并手动创建自定义时钟版本,例如在您的测试中。
Of course, you could also forgo the default constructor and simply add a Clock
bean in your productive configuration, for example like this...当然,您也可以放弃默认构造函数并在您的生产配置中简单地添加一个
Clock
bean,例如像这样......
@Bean
public Clock clock() {
return Clock.systemDefaultZone();
}
...which allows you to use a mocked Clock
as a bean in your test configuration, automatically allowing Spring to @Autowire
it via constructor injection. ...它允许您在测试配置中使用模拟
Clock
作为 bean,自动允许 Spring 通过构造函数注入@Autowire
它。
Good way how to model clock is to use ThreadLocal
, especially when you need it in JPA entity, eg:如何为时钟建模的好方法是使用
ThreadLocal
,尤其是当您在 JPA 实体中需要它时,例如:
@Entity
public class MyEntity {
public static final ThreadLocal<Clock> CLOCK =
ThreadLocal.withInitial(Clock::systemDefaultZone);
}
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