What is the process of setting up and testing internationalization in a React web app using Playwright?


Setting Up and Testing Internationalization in a React Web App with Playwright

First, you'll need to set up your React app for internationalization (i18n). This involves adding libraries like react-i18next or react-intl.

// Install the library
npm install react-i18next i18next

Next, create translation files or use an online service for your app's text content.

// Example of a translation file
  "welcome": "Welcome to our app!",
  "logout": "Log out"

Testing Internationalization with Playwright

With @playwright/test, you can mock different language settings and check if the correct translations are displayed.

import { test } from '@playwright/test';

test('displays correct translation', async ({ page }) => {
  await page.goto('https://ray.run');
  // Mock network requests or modify browser settings here
  // Check if the correct translation is displayed

You can also mock backend responses, allowing you to test the frontend without depending on the backend.

test('mocks backend response', async ({ page }) => {
  await page.route('https://ray.run/api/user', route => {
      status: 200,
      body: JSON.stringify({ name: 'John Doe' }),
  await page.goto('https://ray.run');
  // Check if the frontend handles the mocked response correctly

This way, you can thoroughly test your app's i18n features without relying on real backend services. For more tips on efficient testing with Playwright, check out this blog post.


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Rayrun is a community for QA engineers. I am constantly looking for new ways to add value to people learning Playwright and other browser automation frameworks. If you have feedback, email luc@ray.run.