Test configuration

Introduction​

Playwright has many options to configure how your tests are run. You can specify these options in the configuration file. Note that test runner options are top-level, do not put them into the use section.

Basic Configuration​

Here are some of the most common configuration options.

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

export default defineConfig({
  // Look for test files in the "tests" directory, relative to this configuration file.
  testDir: 'tests',

  // Run all tests in parallel.
  fullyParallel: true,

  // Fail the build on CI if you accidentally left test.only in the source code.
  forbidOnly: !!process.env.CI,

  // Retry on CI only.
  retries: process.env.CI ? 2 : 0,

  // Opt out of parallel tests on CI.
  workers: process.env.CI ? 1 : undefined,

  // Reporter to use
  reporter: 'html',

  use: {
    // Base URL to use in actions like `await page.goto('/')`.
    baseURL: 'http://127.0.0.1:3000',

    // Collect trace when retrying the failed test.
    trace: 'on-first-retry',
  },
  // Configure projects for major browsers.
  projects: [
    {
      name: 'chromium',
      use: { ...devices['Desktop Chrome'] },
    },
  ],
  // Run your local dev server before starting the tests.
  webServer: {
    command: 'npm run start',
    url: 'http://127.0.0.1:3000',
    reuseExistingServer: !process.env.CI,
  },
});

Filtering Tests​

Filter tests by glob patterns or regular expressions.

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

export default defineConfig({
  // Glob patterns or regular expressions to ignore test files.
  testIgnore: '*test-assets',

  // Glob patterns or regular expressions that match test files.
  testMatch: '*todo-tests/*.spec.ts',
});

Advanced Configuration​

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

export default defineConfig({
  // Folder for test artifacts such as screenshots, videos, traces, etc.
  outputDir: 'test-results',

  // path to the global setup files.
  globalSetup: require.resolve('./global-setup'),

  // path to the global teardown files.
  globalTeardown: require.resolve('./global-teardown'),

  // Each test is given 30 seconds.
  timeout: 30000,

});

Expect Options​

Configuration for the expect assertion library.

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

export default defineConfig({
  expect: {
    // Maximum time expect() should wait for the condition to be met.
    timeout: 5000,

    toHaveScreenshot: {
      // An acceptable amount of pixels that could be different, unset by default.
      maxDiffPixels: 10,
    },

    toMatchSnapshot: {
      // An acceptable ratio of pixels that are different to the
      // total amount of pixels, between 0 and 1.
      maxDiffPixelRatio: 0.1,
    },
  },

});