TLS Client Certificates

Playwright now allows to supply client-side certificates, so that server can verify them, as specified by TLS Client Authentication.

When client certificates are specified, all browser traffic is routed through a proxy that establishes the secure TLS connection, provides client certificates to the server and validates server certificates.

The following snippet sets up a client certificate for https://example.com:

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

export default defineConfig({
  // ...
  use: {
    clientCertificates: [{
      origin: 'https://example.com',
      certPath: './cert.pem',
      keyPath: './key.pem',
      passphrase: 'mysecretpassword',
    }],
  },
  // ...
});

You can also provide client certificates to a particular test project or as a parameter of browser.newContext() and apiRequest.newContext().

--only-changed cli option

New CLI option --only-changed allows to only run test files that have been changed since the last git commit or from a specific git "ref".

# Only run test files with uncommitted changes
npx playwright test --only-changed

# Only run test files changed relative to the "main" branch
npx playwright test --only-changed=main

Component Testing: New router fixture

This release introduces an experimental router fixture to intercept and handle network requests in component testing.
There are two ways to use the router fixture:

• Call router.route(url, handler) that behaves similarly to page.route().
• Call router.use(handlers) and pass MSW library request handlers to it.

Here is an example of reusing your existing MSW handlers in the test.

import { handlers } from '@src/mocks/handlers';

test.beforeEach(async ({ router }) => {
  // install common handlers before each test
  await router.use(...handlers);
});

test('example test', async ({ mount }) => {
  // test as usual, your handlers are active
  // ...
});

This fixture is only available in component tests.

UI Mode / Trace Viewer Updates

• Test annotations are now shown in UI mode.
• Content of text attachments is now rendered inline in the attachments pane.
• New setting to show/hide routing actions like route.continue().
• Request method and status are shown in the network details tab.
• New button to copy source file location to clipboard.
• Metadata pane now displays the baseURL.

Miscellaneous

• New maxRetries option in apiRequestContext.fetch() which retries on the ECONNRESET network error.
• New option to box a fixture to minimize the fixture exposure in test reports and error messages.
• New option to provide a custom fixture title to be used in test reports and error messages.

Possibly breaking change

Fixture values that are array of objects, when specified in the test.use() block, may require being wrapped into a fixture tuple. This is best seen on the example:

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

// Define an option fixture that has an "array of objects" value
type User = { name: string, password: string };
const test = base.extend<{ users: User[] }>({
  users: [ [], { option: true } ],
}); 

// Specify option value in the test.use block.
test.use({
  // WRONG: this syntax may not work for you
  users: [
    { name: 'John Doe', password: 'secret' },
    { name: 'John Smith', password: 's3cr3t' },
  ],
  // CORRECT: this syntax will work. Note extra [] around the value, and the "scope" property.
  users: [[
    { name: 'John Doe', password: 'secret' },
    { name: 'John Smith', password: 's3cr3t' },
  ], { scope: 'test' }],
});

test('example test', async () => {
  // ...
});

Browser Versions

• Chromium 128.0.6613.18
• Mozilla Firefox 128.0
• WebKit 18.0

This version was also tested against the following stable channels:

• Google Chrome 127
• Microsoft Edge 127