What is the method to set a fixed timestamp for all tests in Playwright?

Answer

title: "Mocking Date Globally with a Fixed Timestamp in Playwright"

In Playwright, you can emulate a fixed timestamp across all your tests by setting the timezoneId option in your playwright.config.ts file. This allows you to emulate the user's timezone globally.

// playwright.config.ts
module.exports = {
  use: {
    timezoneId: 'Europe/London',
  },
};

This configuration will apply the same timestamp to all tests based on the specified timezone.

If you need to override the global timezone for a specific test, you can use the test.use() method. This method allows you to set various options for individual tests, including locale and timezone.

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

test.use({ locale: 'de-DE', timezoneId: 'Europe/Berlin' });

This will apply the German locale and Berlin timezone only to this specific test, overriding any global settings.

Remember, when emulating timezones, ensure your system clock is accurate to avoid unexpected test results.

For more tips on efficient Playwright test scripts, check out this blog post.