playwright-e2e-builder

What this skill does

# Playwright E2E Test Suite Builder

## When to use

Use this skill when you need to:

- Set up Playwright from scratch in an existing project
- Build E2E tests for critical user flows (signup, checkout, dashboards)
- Implement Page Object Model for maintainable test architecture
- Configure authentication state persistence across tests
- Set up visual regression testing with screenshots
- Integrate Playwright into CI/CD with sharding and retries

## Phase 1: Explore (Plan Mode)

Enter plan mode. Before writing any tests, explore the existing project:

### Project structure
- Find the tech stack: is this React, Next.js, Vue, SvelteKit, or another framework?
- Check if Playwright is already installed (`playwright.config.ts`, `@playwright/test` in package.json)
- Look for existing test directories (`e2e/`, `tests/`, `__tests__/`)
- Check for existing E2E tests in Cypress, Selenium, or other frameworks (migration context)
- Find the dev server command and port (`npm run dev`, `next dev`, etc.)

### Application structure
- Identify the main routes/pages (look at router config, pages directory, or route files)
- Find authentication flow (login page URL, auth API endpoints, token storage)
- Check for test IDs in components (`data-testid`, `data-test`, `data-cy` attributes)
- Look for API routes that tests might need to seed data through
- Check `.env` files for test-specific environment variables

### CI/CD
- Check for existing CI config (`.github/workflows/`, `.gitlab-ci.yml`, `Jenkinsfile`)
- Look for Docker or docker-compose setup (useful for consistent test environments)
- Check if there's a staging/preview environment URL pattern

## Phase 2: Interview (AskUserQuestion)

Use AskUserQuestion to clarify requirements. Ask in rounds.

### Round 1: Scope and critical flows

```
Question: "What are the critical user flows to test?"
Header: "Flows"
multiSelect: true
Options:
  - "Authentication (signup, login, logout, password reset)" — Core auth flows
  - "Core CRUD (create, read, update, delete main resources)" — Primary data operations
  - "Checkout/payments (cart, billing, confirmation)" — E-commerce or payment flows
  - "Dashboard/admin (data views, filters, exports)" — Admin panel interactions
```

```
Question: "How many pages/routes does the application have approximately?"
Header: "App size"
Options:
  - "Small (< 10 routes)" — Landing page, auth, a few feature pages
  - "Medium (10-30 routes)" — Multiple feature areas, settings, profiles
  - "Large (30+ routes)" — Complex app with many sections and user roles
```

### Round 2: Authentication strategy for tests

```
Question: "How does your app handle authentication?"
Header: "Auth type"
Options:
  - "Cookie/session based (Recommended)" — Server sets httpOnly cookies after login
  - "JWT in localStorage" — Token stored in browser localStorage
  - "OAuth/SSO (Google, GitHub, etc.)" — Third-party auth provider redirect flow
  - "No auth (public app)" — No login required

Question: "How should tests authenticate?"
Header: "Test auth"
Options:
  - "Login via UI once, reuse state (Recommended)" — storageState pattern: login in setup, share cookies across tests
  - "API login in beforeEach" — Call auth API directly before each test, skip UI login
  - "Seed auth token in fixtures" — Inject pre-generated tokens, no login flow needed
  - "Test login UI every time" — Actually test the login form in each test suite
```

### Round 3: Test data and environment

```
Question: "How should test data be managed?"
Header: "Test data"
Options:
  - "API seeding in fixtures (Recommended)" — Call API endpoints to create/clean test data before each test
  - "Database seeding (direct SQL)" — Run SQL scripts or ORM commands to populate test database
  - "Shared test environment (pre-populated)" — Tests run against a persistent staging environment with existing data
  - "Mock API responses" — Intercept network requests and return mock data

Question: "What environment do E2E tests run against?"
Header: "Environment"
Options:
  - "Local dev server (Recommended)" — Start dev server before tests, run against localhost
  - "Preview/staging URL" — Run against a deployed preview or staging environment
  - "Docker Compose stack" — Full stack in containers, tests run outside or inside
```

### Round 4: CI and parallelization

```
Question: "How should tests run in CI?"
Header: "CI"
Options:
  - "GitHub Actions (Recommended)" — Native Playwright support with sharding
  - "GitLab CI" — Docker-based runners with Playwright image
  - "Local only (no CI yet)" — Just local test runs for now
  - "Other CI (Jenkins, CircleCI)" — Custom CI configuration

Question: "Do you need visual regression testing?"
Header: "Visual"
Options:
  - "No — functional tests only (Recommended)" — Assert behavior, not pixels
  - "Yes — screenshot comparisons" — Capture and compare page screenshots
  - "Yes — component screenshots" — Capture specific components, not full pages
```

## Phase 3: Plan (ExitPlanMode)

Write a concrete implementation plan covering:

1. **Directory structure** — test files, page objects, fixtures, config
2. **Playwright config** — projects (browsers), base URL, retries, workers
3. **Auth setup** — global setup for storageState or API-based auth
4. **Page objects** — classes for each page with locators and actions
5. **Test fixtures** — custom fixtures for data seeding, auth, API client
6. **Test suites** — test files for each critical flow from the interview
7. **CI config** — workflow file with sharding, artifact upload, reporting

Present via ExitPlanMode for user approval.

## Phase 4: Execute

After approval, implement following this order:

### Step 1: Playwright config

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

export default defineConfig({
  testDir: './e2e',
  fullyParallel: true,
  forbidOnly: !!process.env.CI,
  retries: process.env.CI ? 2 : 0,
  workers: process.env.CI ? 1 : undefined,
  reporter: process.env.CI
    ? [['html', { open: 'never' }], ['github']]
    : [['html', { open: 'on-failure' }]],

  use: {
    baseURL: process.env.BASE_URL || 'http://localhost:3000',
    trace: 'on-first-retry',
    screenshot: 'only-on-failure',
    video: 'on-first-retry',
  },

  projects: [
    // Auth setup — runs before all tests
    {
      name: 'setup',
      testMatch: /.*\.setup\.ts/,
    },
    {
      name: 'chromium',
      use: {
        ...devices['Desktop Chrome'],
        storageState: 'e2e/.auth/user.json',
      },
      dependencies: ['setup'],
    },
    {
      name: 'firefox',
      use: {
        ...devices['Desktop Firefox'],
        storageState: 'e2e/.auth/user.json',
      },
      dependencies: ['setup'],
    },
    {
      name: 'mobile',
      use: {
        ...devices['iPhone 14'],
        storageState: 'e2e/.auth/user.json',
      },
      dependencies: ['setup'],
    },
  ],

  webServer: {
    command: 'npm run dev',
    url: 'http://localhost:3000',
    reuseExistingServer: !process.env.CI,
    timeout: 120_000,
  },
});
```

### Step 2: Auth setup (global)

```typescript
// e2e/auth.setup.ts
import { test as setup, expect } from '@playwright/test';

const authFile = 'e2e/.auth/user.json';

setup('authenticate', async ({ page }) => {
  // Navigate to login page
  await page.goto('/login');

  // Fill login form
  await page.getByLabel('Email').fill(process.env.TEST_USER_EMAIL || '[email protected]');
  await page.getByLabel('Password').fill(process.env.TEST_USER_PASSWORD || 'testpassword');
  await page.getByRole('button', { name: 'Sign in' }).click();

  // Wait for auth to complete — adjust selector to your app
  await page.waitForURL('/dashboard');
  await expect(page.getByRole('navigation')).toBeVisible();

  // Save signed-in state
  await page.context().storageState({ path: authFile });
});
```

### Step 3: Custom fixtures

```typescript
// e2e/fixtures.ts
import { test as base, expect } from '@playwright/test';
import { LoginPage } from './pages/login-page';
im