How to set the browser's language in Cypress.io (electron/chrome)?

user_526660 0
Viewed 9205

My question is about configuring Cypress to launch a browser instance in a certain language.

In order to:

  • make assertions on localized (i18n) text labels?
  • check i18n features (switching between languages)
  • bypass issues of Continuous Integration (CI/CD) when, for example, on a local computer, the browser default to fr_FR, and on the CI/CD VM it defaults to en_US?

I tried (without much success):

Thanks!

e2e-testing cypress lang internationalization configuration
4 Answers
user_42853060

To set the language in the browser and also for request, which was what I had to do for my tests, the following worked for me:

cy.visit('url', {
    onBeforeLoad(win) {
      Object.defineProperty(win.navigator, 'language', { value: 'de-DE' });
      Object.defineProperty(win.navigator, 'languages', { value: ['de'] });
      Object.defineProperty(win.navigator, 'accept_languages', { value: ['de'] });
    },
    headers: {
      'Accept-Language': 'de',
    },
});
user_54938130

navigator has two lang props:

  • language ({ value: 'en-GB'}
  • languages(['en-GB'])

navigator.language refers to the first element of navigator.languages but some libraries check navigator.languages[0] instead of navigator.language, so better if you set both properties

onBeforeLoad: (window, ...args) => {
  Object.defineProperty(window.navigator, 'language', { value: 'en-GB' });
  Object.defineProperty(window.navigator, 'languages', ['en-GB']);

ref: https://developer.mozilla.org/en-US/docs/Web/API/NavigatorLanguage/languages

user_37649940

In support/index.js

Cypress.on('window:before:load', window => {
  Object.defineProperty(window.navigator, 'language', { value: 'fr' });
});
user_33235910
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