如何在 Javascript 中为特定日期和时区编写测试？答案

【问题标题】：How can I write tests for specific dates and time zones in Javascript?如何在 Javascript 中为特定日期和时区编写测试？
【发布时间】：2022-12-03 16:34:49
【问题描述】：

I am using Jest for writing my tests.

I would like to write tests for specific dates and time zones. I already found some solutions for this, but they are not exactly what I need.

Dates:

I know that I can use jest.setSystemTime() to write tests for specific dates. The problem is that I am using a custom date object that extends from the built-in date object. For example, if I run:

jest.setSystemTime(new Date(\'2022-10-05\'));
        
console.log(new Date());
console.log(new CustomDate());

new Date() shows the date I set, but new CustomDate() still shows the current moment. Does anyone know how to fix that?

Time zones:

I know that I can set my time zone when I run jest, for example: TZ=\"Australia/Sydney\" yarn test.

I can also set the time zone in the jest.config.js file.

While both these solutions work, I would have to manually change the time zone and run my tests many times.

Is there any way to change the time zone inside the test itself?

Why don\'t you just mock CustomDate?

标签： javascript testing jestjs

【解决方案1】：