How do I configure Playwright to run tests in parallel against multiple backends?

Answer

Sure, you can run your Playwright tests in parallel against multiple backends. This can speed up your test execution time.

To do this, use the test.describe.configure() function. Set the mode to "parallel". This will run tests within a single file concurrently. Here's how to do it:

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

test.describe.configure({ mode: 'parallel' });

test('runs in parallel 1', async ({ page }) => {
  // Test logic...
});

test('runs in parallel 2', async ({ page }) => {
  // Test logic...
});

In this example, runs in parallel 1 and runs in parallel 2 will run at the same time. Each test will run all relevant hooks like beforeAll and afterAll independently.

If you want to run all your tests or specific projects in parallel, modify the configuration file (playwright.config.ts). Here's how:

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

export default defineConfig({
  fullyParallel: true,
});

This will run all tests across different files or projects at the same time. But remember, each test runs in its own worker process and can't share any state or global variables. So, make sure your tests are isolated and independent.

For more tips on efficient test execution, check out Maximizing Test Efficiency with Parallelism in Playwright.