java:如何模拟 Calendar.getInstance()? [英] java: how to mock Calendar.getInstance()?

问题描述

在我的代码中，我有这样的东西:

In my code I have something like this:

private void doSomething() {
   Calendar today = Calendar.getInstance();
   ....
}

如何在我的 junit 测试中模拟"它以返回特定日期?

How can I "mock" it in my junit test to return a specific date?

推荐答案

据我所知，您有三个明智的选择:

As far as I see it you have three sensible options:

1. 在您当天设置的任何方法/类中注入 Calendar 实例.

private void method(final Calendar cal){今天的日期 = cal.getTime();}

使用 JodaTime 而不是 Calendar.这不是一个选项，而是一个建议案例，因为 JodaTime 将使您的生活更轻松.这次您仍然需要将其注入到方法中.

Use JodaTime instead of Calendar. This is less an option and more a case of a suggestion as JodaTime will make your life a lot easier. You will still need to inject this time in to the method.

DateTime dt = new DateTime();

日期 jdkDate = dt.toDate();

将 Calendar 包裹在一些允许您获取时间的界面中.然后你只需模拟该接口并让它返回一个常量 Date.

Wrap Calendar inside some interface that allows you to fetch the time. You then just mock that interface and get it to return a constant Date.

今天的日期 = calendarInterfaceInstance.getCurrentDate()

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