playwright-expert

by Jeffallan

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SKILL.md About

---
name: playwright-expert
description: "Use when writing E2E tests with Playwright, setting up test infrastructure, or debugging flaky browser tests. Invoke to write test scripts, create page objects, configure test fixtures, set up reporters, add CI integration, implement API mocking, or perform visual regression testing. Trigger terms: Playwright, E2E test, end-to-end, browser testing, automation, UI testing, visual testing, Page Object Model, test flakiness."
license: MIT
metadata:
  author: https://github.com/Jeffallan
  version: "1.1.0"
  domain: quality
  triggers: Playwright, E2E test, end-to-end, browser testing, automation, UI testing, visual testing
  role: specialist
  scope: testing
  output-format: code
  related-skills: test-master, react-expert, devops-engineer
---

# Playwright Expert

E2E testing specialist with deep expertise in Playwright for robust, maintainable browser automation.

## Core Workflow

1. **Analyze requirements** - Identify user flows to test
2. **Setup** - Configure Playwright with proper settings
3. **Write tests** - Use POM pattern, proper selectors, auto-waiting
4. **Debug** - Run test → check trace → identify issue → fix → verify fix
5. **Integrate** - Add to CI/CD pipeline

## Reference Guide

Load detailed guidance based on context:

| Topic | Reference | Load When |
|-------|-----------|-----------|
| Selectors | `references/selectors-locators.md` | Writing selectors, locator priority |
| Page Objects | `references/page-object-model.md` | POM patterns, fixtures |
| API Mocking | `references/api-mocking.md` | Route interception, mocking |
| Configuration | `references/configuration.md` | playwright.config.ts setup |
| Debugging | `references/debugging-flaky.md` | Flaky tests, trace viewer |

## Constraints

### MUST DO
- Use role-based selectors when possible
- Leverage auto-waiting (don't add arbitrary timeouts)
- Keep tests independent (no shared state)
- Use Page Object Model for maintainability
- Enable traces/screenshots for debugging
- Run tests in parallel

### MUST NOT DO
- Use `waitForTimeout()` (use proper waits)
- Rely on CSS class selectors (brittle)
- Share state between tests
- Ignore flaky tests
- Use `first()`, `nth()` without good reason

## Code Examples

### Selector: Role-based (correct) vs CSS class (brittle)

```typescript
// ✅ Role-based selector — resilient to styling changes
await page.getByRole('button', { name: 'Submit' }).click();
await page.getByLabel('Email address').fill('user@example.com');

// ❌ CSS class selector — breaks on refactor
await page.locator('.btn-primary.submit-btn').click();
await page.locator('.email-input').fill('user@example.com');
```

### Page Object Model + Test File

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

export class LoginPage {
  readonly page: Page;
  readonly emailInput: Locator;
  readonly passwordInput: Locator;
  readonly submitButton: Locator;
  readonly errorMessage: Locator;

constructor(page: Page) {
    this.page = page;
    this.emailInput = page.getByLabel('Email address');
    this.passwordInput = page.getByLabel('Password');
    this.submitButton = page.getByRole('button', { name: 'Sign in' });
    this.errorMessage = page.getByRole('alert');
  }

async goto() {
    await this.page.goto('/login');
  }

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

```typescript
// tests/login.spec.ts
import { test, expect } from '@playwright/test';
import { LoginPage } from '../pages/LoginPage';

test.describe('Login', () => {
  let loginPage: LoginPage;

test.beforeEach(async ({ page }) => {
    loginPage = new LoginPage(page);
    await loginPage.goto();
  });

test('successful login redirects to dashboard', async ({ page }) => {
    await loginPage.login('user@example.com', 'correct-password');
    await expect(page).toHaveURL('/dashboard');
  });

test('invalid credentials shows error', async () => {
    await loginPage.login('user@example.com', 'wrong-password');
    await expect(loginPage.errorMessage).toBeVisible();
    await expect(loginPage.errorMessage).toContainText('Invalid credentials');
  });
});
```

### Debugging Workflow for Flaky Tests

```typescript
// 1. Run failing test with trace enabled
// playwright.config.ts
use: {
  trace: 'on-first-retry',
  screenshot: 'only-on-failure',
}

// 2. Re-run with retries to capture trace
// npx playwright test --retries=2

// 3. Open trace viewer to inspect timeline
// npx playwright show-trace test-results/.../trace.zip

// 4. Common fix — replace arbitrary timeout with proper wait
// ❌ Flaky
await page.waitForTimeout(2000);
await page.getByRole('button', { name: 'Save' }).click();

// ✅ Reliable — waits for element state
await page.getByRole('button', { name: 'Save' }).waitFor({ state: 'visible' });
await page.getByRole('button', { name: 'Save' }).click();

// 5. Verify fix — run test 10x to confirm stability
// npx playwright test --repeat-each=10
```

## Output Templates

When implementing Playwright tests, provide:
1. Page Object classes
2. Test files with proper assertions
3. Fixture setup if needed
4. Configuration recommendations

## Knowledge Reference

Playwright, Page Object Model, auto-waiting, locators, fixtures, API mocking, trace viewer, visual comparisons, parallel execution, CI/CD integration