Mockito.捕获对LocalDateTime.now()的调用； [英] Mockito. Capturing a call to LocalDateTime.now();

问题描述

我正在做一个单元测试，它调用一个类并检查是否已使用某些参数调用了该类中的方法.这些参数之一是LocalDateTime.now().

I'm doing a unit test which calls a class and checks that a method in that class has been called with certain parameters. One of those parameters is LocalDateTime.now().

我的问题是，当时间控件返回到我的JUnit测试时，时间已经过去了，因此，如果我尝试将正在调用的类中使用的时间与当前时间进行比较，则它们将不匹配

My problem is that by the time control comes back to my JUnit test, time has marched on, so if I try to compare the time used in the class I'm calling with the current time, they ain't gonna match.

这是我正在寻找的方法:

This is the method I'm looking at:

ServiceStatus serviceStatus = ServiceStatus.createNew(LocalDateTime.now());

Junit测试是:

verify(service).saveNotice(LocalDateTime.now));

我尝试使用TimeFactory来确定日期:

I've tried using TimeFactory to fix the date:

given(timeFactory.currentDateTime()).willReturn(NOW);

其次:

given(message.getHeader("MESSAGE_CREATED_TIME")).willReturn(NOW.toString());

&

verify(service).saveNotice(NOW));

但没有喜悦.

有什么建议吗?

(PS.在实际的代码中，还有其他参数，但出于简单起见和出于商业机密的原因，我将其删除了.)

(PS. In the actual code there are other parameters but I've stripped them out for the sake of simplicity and for reasons of commercial confidentiality.)

推荐答案

请勿使用PowerMock.改用/模拟时钟.将您的呼叫切换到LocalDateTime.now()到LocalDateTime.now(clock).从时钟文档:

Don't use PowerMock. Use/mock a Clock instead. Switch your call to LocalDateTime.now() to LocalDateTime.now(clock). From the Clock docs:

应用程序的最佳实践是将Clock传递到需要当前时刻的任何方法中.依赖项注入框架是实现此目标的一种方法:

Best practice for applications is to pass a Clock into any method that requires the current instant. A dependency injection framework is one way to achieve this:

public class MyBean {
  private Clock clock;  // dependency inject
  ...
  public void process(LocalDate eventDate) {
    if (eventDate.isBefore(LocalDate.now(clock)) {
      ...
    }
  }
}

这种方法允许在测试过程中使用备用时钟，例如固定时钟或偏移时钟.

This approach allows an alternate clock, such as fixed or offset to be used during testing.

有一种策略可以使clock最终化，并提供两个构造函数-一个使用提供的时钟，而另一个将系统时钟从Clock.systemDefaultZone()或Clock.systemUTC()中取出.另一个方法是使Clock字段可设置为进行测试，可能将其设置为package-private.无论哪种情况，您都可以通过提供由Clock.fixed(...)创建的Clock来轻松覆盖该值，或者如果需要在测试期间进行更改，则可以编写自己的实现.

One strategy there is to make the clock final, and offer two constructors--one that uses a supplied clock, and one that gets the system clock out of Clock.systemDefaultZone() or Clock.systemUTC(). Another is to make the Clock field settable for testing, possibly by leaving it package-private. In either case, you could easily override the value by supplying a Clock created by Clock.fixed(...), or write your own implementation if you need it to change across the duration of the test.

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