playwright

What this skill does

# Playwright Skill

Expert assistance for building comprehensive E2E test suites with Playwright, including page objects, fixtures, visual regression, and CI/CD integration.

## Capabilities

- Generate Playwright test project structure
- Create page object models for maintainable tests
- Implement custom fixtures and test utilities
- Configure visual regression testing
- Set up accessibility testing with axe-core
- Integrate with CI/CD pipelines (GitHub Actions, etc.)
- Generate API testing alongside UI tests

## Usage

Invoke this skill when you need to:
- Set up Playwright testing for a web application
- Create page object patterns for test organization
- Implement visual regression testing
- Configure cross-browser testing
- Set up CI/CD test automation

## Inputs

| Parameter | Type | Required | Description |
|-----------|------|----------|-------------|
| projectType | string | No | web, api, component (default: web) |
| framework | string | No | react, nextjs, vue, angular |
| browsers | array | No | chromium, firefox, webkit (default: all) |
| features | array | No | visual, a11y, api, component |
| ci | string | No | github, gitlab, jenkins |

### Test Configuration

```json
{
  "projectType": "web",
  "framework": "nextjs",
  "browsers": ["chromium", "firefox"],
  "features": ["visual", "a11y", "api"],
  "ci": "github",
  "baseUrl": "http://localhost:3000"
}
```

## Output Structure

```
tests/
├── playwright.config.ts           # Playwright configuration
├── fixtures/
│   ├── base.ts                   # Base test fixture
│   ├── auth.ts                   # Authentication fixture
│   └── api.ts                    # API helper fixture
├── pages/
│   ├── BasePage.ts               # Base page object
│   ├── LoginPage.ts              # Login page object
│   └── DashboardPage.ts          # Dashboard page object
├── e2e/
│   ├── auth/
│   │   ├── login.spec.ts
│   │   └── logout.spec.ts
│   ├── dashboard/
│   │   └── dashboard.spec.ts
│   └── api/
│       └── users.api.spec.ts
├── visual/
│   ├── homepage.visual.spec.ts
│   └── screenshots/              # Baseline screenshots
├── a11y/
│   └── accessibility.spec.ts
├── utils/
│   ├── helpers.ts
│   └── test-data.ts
└── .github/
    └── workflows/
        └── playwright.yml        # CI workflow
```

## Generated Code Patterns

### Playwright Configuration

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

export default defineConfig({
  testDir: './tests',
  fullyParallel: true,
  forbidOnly: !!process.env.CI,
  retries: process.env.CI ? 2 : 0,
  workers: process.env.CI ? 1 : undefined,
  reporter: [
    ['html', { open: 'never' }],
    ['json', { outputFile: 'test-results/results.json' }],
    ['junit', { outputFile: 'test-results/junit.xml' }],
  ],
  use: {
    baseURL: process.env.BASE_URL ?? 'http://localhost:3000',
    trace: 'on-first-retry',
    screenshot: 'only-on-failure',
    video: 'retain-on-failure',
  },
  projects: [
    { name: 'setup', testMatch: /.*\.setup\.ts/ },
    {
      name: 'chromium',
      use: { ...devices['Desktop Chrome'] },
      dependencies: ['setup'],
    },
    {
      name: 'firefox',
      use: { ...devices['Desktop Firefox'] },
      dependencies: ['setup'],
    },
    {
      name: 'webkit',
      use: { ...devices['Desktop Safari'] },
      dependencies: ['setup'],
    },
    {
      name: 'mobile-chrome',
      use: { ...devices['Pixel 5'] },
      dependencies: ['setup'],
    },
    {
      name: 'mobile-safari',
      use: { ...devices['iPhone 13'] },
      dependencies: ['setup'],
    },
  ],
  webServer: {
    command: 'npm run dev',
    url: 'http://localhost:3000',
    reuseExistingServer: !process.env.CI,
  },
});
```

### Base Page Object

```typescript
// tests/pages/BasePage.ts
import { Page, Locator, expect } from '@playwright/test';

export abstract class BasePage {
  readonly page: Page;
  readonly header: Locator;
  readonly footer: Locator;
  readonly loadingSpinner: Locator;

  constructor(page: Page) {
    this.page = page;
    this.header = page.locator('header');
    this.footer = page.locator('footer');
    this.loadingSpinner = page.locator('[data-testid="loading"]');
  }

  abstract get url(): string;

  async goto() {
    await this.page.goto(this.url);
    await this.waitForPageLoad();
  }

  async waitForPageLoad() {
    await this.loadingSpinner.waitFor({ state: 'hidden' });
  }

  async expectToBeVisible() {
    await expect(this.page).toHaveURL(new RegExp(this.url));
  }

  async getToastMessage(): Promise<string | null> {
    const toast = this.page.locator('[role="alert"]');
    if (await toast.isVisible()) {
      return toast.textContent();
    }
    return null;
  }
}
```

### Login Page Object

```typescript
// tests/pages/LoginPage.ts
import { Page, Locator, expect } from '@playwright/test';
import { BasePage } from './BasePage';

export class LoginPage extends BasePage {
  readonly emailInput: Locator;
  readonly passwordInput: Locator;
  readonly submitButton: Locator;
  readonly errorMessage: Locator;
  readonly forgotPasswordLink: Locator;

  constructor(page: Page) {
    super(page);
    this.emailInput = page.getByLabel('Email');
    this.passwordInput = page.getByLabel('Password');
    this.submitButton = page.getByRole('button', { name: 'Sign in' });
    this.errorMessage = page.locator('[role="alert"]');
    this.forgotPasswordLink = page.getByRole('link', { name: 'Forgot password?' });
  }

  get url() {
    return '/login';
  }

  async login(email: string, password: string) {
    await this.emailInput.fill(email);
    await this.passwordInput.fill(password);
    await this.submitButton.click();
  }

  async expectErrorMessage(message: string) {
    await expect(this.errorMessage).toContainText(message);
  }

  async expectLoginSuccess() {
    await expect(this.page).toHaveURL(/\/dashboard/);
  }
}
```

### Custom Fixtures

```typescript
// tests/fixtures/base.ts
import { test as base, expect } from '@playwright/test';
import { LoginPage } from '../pages/LoginPage';
import { DashboardPage } from '../pages/DashboardPage';

interface TestFixtures {
  loginPage: LoginPage;
  dashboardPage: DashboardPage;
}

interface WorkerFixtures {
  authenticatedPage: void;
}

export const test = base.extend<TestFixtures, WorkerFixtures>({
  loginPage: async ({ page }, use) => {
    const loginPage = new LoginPage(page);
    await use(loginPage);
  },

  dashboardPage: async ({ page }, use) => {
    const dashboardPage = new DashboardPage(page);
    await use(dashboardPage);
  },

  authenticatedPage: [
    async ({ browser }, use) => {
      const context = await browser.newContext({
        storageState: 'tests/.auth/user.json',
      });
      await use();
      await context.close();
    },
    { scope: 'worker' },
  ],
});

export { expect };
```

### Authentication Setup

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

const authFile = path.join(__dirname, '.auth/user.json');

setup('authenticate', async ({ page }) => {
  await page.goto('/login');
  await page.getByLabel('Email').fill(process.env.TEST_USER_EMAIL!);
  await page.getByLabel('Password').fill(process.env.TEST_USER_PASSWORD!);
  await page.getByRole('button', { name: 'Sign in' }).click();

  await expect(page).toHaveURL(/\/dashboard/);
  await page.context().storageState({ path: authFile });
});
```

### E2E Test Example

```typescript
// tests/e2e/auth/login.spec.ts
import { test, expect } from '../../fixtures/base';

test.describe('Login', () => {
  test.beforeEach(async ({ loginPage }) => {
    await loginPage.goto();
  });

  test('should login with valid credentials', async ({ loginPage }) => {
    await loginPage.login('[email protected]', 'password123');
    await loginPage.expectLoginSuccess();
  });

  test('should show error with invalid credentials', async ({ loginPage }) => {
    await loginPage.login('[email protected]', '