java 如何模拟 JodaTime 的实际日期？
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How can I mock JodaTime actual date?
提问by Adriano Bacha
I want to test this method:
我想测试这个方法：
public FirmOrder findActiveByModelColor(ModelColor modelColor) {
Query query = em.createQuery("FROM FirmOrder fo WHERE fo.modelColor = :modelColor AND fo.year = :year AND fo.month = :month");
query.setParameter("modelColor", modelColor);
query.setParameter("year", new DateTime().year().get());
query.setParameter("month", new DateTime().monthOfYear().get());
return (FirmOrder) query.getSingleResult();
}
but I need DateTime().year().get()and DateTime().dayOfMonth().get()to always return the same date
但我需要DateTime().year().get()并且DateTime().dayOfMonth().get()总是返回相同的日期
tks
tks
回答by axtavt
If you can't add a factory object as suggested by skaffman, you can use DateTimeUtils.setCurrentMillisFixed().
如果您无法按照 skaffman 的建议添加工厂对象，则可以使用DateTimeUtils.setCurrentMillisFixed().
回答by skaffman
Then you need to define a Clockinterface, and inject it into your class
然后你需要定义一个Clock接口，并将其注入到你的类中
public interface Clock {
DateTime getCurrentDateTime();
}
then:
然后：
Clock clock;
public FirmOrder findActiveByModelColor(ModelColor modelColor) {
Query query = em.createQuery("FROM FirmOrder fo WHERE fo.modelColor = :modelColor AND fo.year = :year AND fo.month = :month");
query.setParameter("modelColor", modelColor);
query.setParameter("year", clock.getCurrentDateTime().year().get());
query.setParameter("month", clock.getCurrentDateTime().dayOfMonth().get());
return (FirmOrder) query.getSingleResult();
}
Your test can then inject an implementation of Clock(e.g. using a mocking framework) that always returns a fixed time.
然后，您的测试可以注入一个Clock始终返回固定时间的实现（例如使用模拟框架）。
I use the Clockinterface a lot in my own stuff, and I remain surprised that it's not part of one of the common libraries out there. I have two implementations I use a lot, WallClockand StoppedClock(which is useful for tests that use a fixed time).
我Clock在自己的东西中经常使用该界面，但我仍然惊讶于它不是现有公共库之一的一部分。我有两个我经常使用的实现，WallClock并且StoppedClock（这对于使用固定时间的测试很有用）。
回答by Behrang Saeedzadeh
Looks like the only option is to use the answer feature to post this comment:
看起来唯一的选择是使用答案功能发布此评论：
The following portion of your code can lead to hard-to-detect errors:
代码的以下部分可能会导致难以检测的错误：
query.setParameter("year", new DateTime().year().get());
query.setParameter("month", new DateTime().monthOfYear().get());
Let's pretend tha today is the last day of the year 2011 and this part of code is called 1 nano second prior to the new year and that the first statement takes more than 1 nano second to complete. This means that year will be set to 2011 but month to 1 but it had to best either to 2011/12 or 2012/1.
让我们假设今天是 2011 年的最后一天，这部分代码在新年前被称为 1 纳秒，并且第一个语句需要超过 1 纳秒才能完成。这意味着年份将设置为 2011 年，但月份为 1，但它必须最好设置为 2011/12 或 2012/1。
Though that statistically it is very unlikely to happen, but logically it can happen :)
虽然从统计上来说它不太可能发生，但从逻辑上讲它可能会发生:)
You should create one DateTime instance and use that to populate both of yearand month.
您应该创建一个 DateTime 实例并使用它来填充year和month。
回答by Rogério
It's easy, if using the JMockitExpectations mocking API:
如果使用JMockitExpectations 模拟 API ，这很容易：
@Test
public void findActiveByModelColor()
{
new NonStrictExpectations()
{
@Cascading DateTime dt;
{
dt.year().get(); result = 2010;
dt.monthOfYear().get(); result = 12;
}
};
FirmOrder fo = testedObject.findActiveByModelColor(modelColor);
// asserts...
}
