javascript - 在Jest测试中设置时刻时区(Set moment timezone in Jest tests)

Question

I have the util function that is parsing given date (ie '2019-01-28') in specific date format and then using momentJS retrieving beginning of that day and converting it to ISO date format:

(我有util函数，它以特定的日期格式解析给定的日期（即“ 2019-01-28”），然后使用momentJS检索当天的开始并将其转换为ISO日期格式：)

dates.js

(dates.js)

import moment from 'moment'

export const getApiDateFormat = (date, dateFormat = getLocaleDateString()) =>
    moment(date, dateFormat)
      .startOf('day')
      .toISOString()

I would like to test this function using Jest and set the specific timezone for moment to use those tests independent of my location.

(我想使用Jest测试此功能，并moment设置特定时区以独立于我的位置使用这些测试。)

For now, I have:

(现在，我有：)

dates.test.js

(dates.test.js)

const formattedDate = '2019-01-27T23:00:00.000Z'

test('date in russian format - 28.01.2019', () => {
      const russianDateFormat = 'DD.MM.YYYY'
      expect(getApiDateFormat('28.01.2019', russianDateFormat)).toEqual(
        formattedDate,
      )
    })

since I'm currently located in Europe/Warsaw timezone.

(由于我目前位于Europe/Warsaw时区。)

How to make this test location independent?

(如何使该测试位置独立？)

I've tried to use jest.mock to replace moment used by getApiDateFormat by moment.tz.setDefault("America/New_York") , however, all my attempts have failed since they have no influence on moment lib imported by getApiDateFormat .

(我试着使用jest.mock更换moment使用getApiDateFormat由moment.tz.setDefault("America/New_York")但是，我所有的尝试都失败了，因为他们有没有影响moment LIB采用进口getApiDateFormat 。)

How to solve such a problem and test it properly?

(如何解决此类问题并进行正确测试？)

  ask by yqbk translate from so

Answer 1

Use TZ env var...

(使用TZ变量...)

You can prepend to your package.json so all machines run with the same timezone like so:

(您可以在package.json前缀，以便所有计算机都在相同的时区运行，如下所示：)

  "scripts": {
    "test": "TZ=UTC jest",
    "coverage": "TZ=UTC jest --coverage"
  },