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

Question

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?<

Answer 1

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

Answer 2

In support/index.js

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

Answer 3

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',
    },
});

Answer 4

from Gleb Bahmutov:

you set it during cy.visit using onBeforeLoad with something like Object.defineProperty(navigator, 'language', { value: 'de-GE' })

src: https://gitter.im/cypress-io/cypress?at=5d61408a07d1ff39f8769545