Playwright
Playwright is a testing framework that allows you to run tests automatically in Chromium, Firefox, and WebKit environments using a single API. You can use it to write E2E tests.
To use Playwright in Modern.js, you need to install the dependencies first. You can run the following commands:
npm init playwrightThe above commands will automatically install Playwright dependencies and help you install and configure it in your project through a series of prompts, including adding a playwright.config.ts file.
Refer to the official Playwright documentation at Install Playwright for a more detailed guide.
After creating with the default configuration, you can see the following files in your project:
import { test, expect } from '@playwright/test';
test('has title', async ({ page }) => {
await page.goto('https://playwright.dev/');
// Expect a title "to contain" a substring.
await expect(page).toHaveTitle(/Playwright/);
});
test('get started link', async ({ page }) => {
await page.goto('https://playwright.dev/');
// Click the get started link.
await page.getByRole('link', { name: 'Get started' }).click();
// Expects page to have a heading with the name of Installation.
await expect(
page.getByRole('heading', { name: 'Installation' }),
).toBeVisible();
});This is the default test file. Now create some new pages and test them.
Create E2E Tests
First, create two Modern.js pages.
import { Link } from '@modern-js/runtime/router';
const Index = () => (
<div>
<h1>Home</h1>
<Link to="/about">About</Link>
</div>
);
export default Index;import { Link } from '@modern-js/runtime/router';
const Index = () => (
<div>
<h1>About</h1>
<Link to="/">Home</Link>
</div>
);
export default Index;Next, add test cases to ensure the links on your pages work properly.
import { test, expect } from '@playwright/test'
test('should navigate to the about page', async ({ page }) => {
// Start from the index page (the baseURL is set via the webServer in the playwright.config.ts)
await page.goto('http://localhost:8080/')
// Find an element with the text 'About' and click on it
await page.click('text=About')
// The new URL should be "/about" (baseURL is used there)
await expect(page).toHaveURL('http://localhost:8080/about')
// The new page should contain an h1 with "About"
await expect(page.locator('h1')).toContainText('About')
})Run Test Cases
Playwright requires your Modern.js server to be running. We recommend running your test cases under production builds; you can run pnpm run build and pnpm run serve to simulate the production environment locally.
info Starting production server...
> Local: http://localhost:8080/
> Network: http://10.94.59.30:8080/After the project is successfully built and running, you can run Playwright cases in another terminal by executing npx playwright test:
Running 3 tests using 3 workers
3 passed (2.0s)
To open last HTML report run:
npx playwright show-report