如何在JEST中模拟Cookie.get('language') [英] How to mock Cookie.get('language') in JEST

问题描述

我有一个功能，可以在cookie中设置一种语言并获取其某些功能.如何正确设置语言的值以便在JEST中进行测试

I have a function which sets a language in cookie and gets it for some functionality. How do I set the value of language correctly for testing in JEST

function resolveLanguage () {
  // browser cookie is checked to see if there is a value for language
  const lang = Cookie.get('language')

  // If no lang, it is defaulted to en 
  return lang || 'en'
}

现在我想在JEST中对其进行测试

Now I want to test it in JEST

it('can resolve the language using a cookie', () => {
      Cookie.__defineGetter__("language", function() {
        return 'fr'
      })
      // console.log(Cookie.language) //returns fr
      // console.log(Cookie.get('language')) //returns fr
      expect(module.resolveLanguage()).toBe('fr') ---FAILS because it returns en
    })

推荐答案

不必下载任何dep，只需使用:

Don't have to download any deps, just use:

Object.defineProperty(window.document, 'cookie', {
  writable: true,
  value: 'myCookie=omnomnom',
});

(writable需要设置为true)

(writable needs to be set to true)

这篇关于如何在JEST中模拟Cookie.get('language')的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！