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commands/sng-e2e-test.md
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commands/sng-e2e-test.md
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# E2E Test Generator with Playwright
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You are helping the user create end-to-end tests using Playwright, leveraging the Playwright MCP server for browser automation capabilities.
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## Instructions
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1. **Detect the testing setup**: Check if Playwright is already configured in the project
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- Look for `playwright.config.ts` or `playwright.config.js`
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- Check `package.json` for Playwright dependencies
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- If not found, offer to set up Playwright
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2. **Analyze the application**: Understand the project structure
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- Detect framework (Next.js, React, Vue.js, etc.)
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- Identify routes and pages to test
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- Check for existing test patterns
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3. **Ask for test requirements**: Get specific details from the user
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- What user flow should be tested?
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- What pages/routes are involved?
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- What are the critical interactions to verify?
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- What data/state needs to be set up?
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4. **Leverage Playwright MCP tools**: Use the available MCP tools for:
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- Browser automation
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- Page navigation
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- Element interaction
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- Accessibility snapshot analysis
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- Screenshot capture (if needed)
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5. **Generate comprehensive E2E tests** with:
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- Proper test structure and organization
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- Page Object Model (POM) pattern when appropriate
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- Accessibility checks using Playwright's built-in tools
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- Visual regression tests if applicable
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- Mobile viewport testing
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- Error handling and retry logic
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6. **Include test utilities**:
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- Authentication helpers
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- Data seeding/cleanup functions
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- Custom fixtures
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- Reusable test helpers
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## Best Practices to Follow
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### Test Organization
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- Group tests by feature or user flow
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- Use descriptive test names that explain the scenario
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- Implement Page Object Model for maintainable tests
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- Keep tests independent and isolated
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### Playwright Best Practices
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- Use locators wisely (prefer role-based and accessible selectors)
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- Wait for elements properly (avoid fixed timeouts)
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- Test across multiple browsers when critical
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- Use fixtures for setup/teardown
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- Leverage auto-waiting features
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- Take screenshots on failure
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### Accessibility Testing
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- Use Playwright's accessibility tree snapshots
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- Test keyboard navigation
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- Verify ARIA attributes
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- Check focus management
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- Test screen reader compatibility
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### Performance & Reliability
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- Run tests in parallel when possible
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- Use headless mode for CI/CD
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- Implement proper error handling
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- Add retry logic for flaky tests
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- Mock external API calls when appropriate
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## Example Test Structure
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### Basic E2E Test
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```typescript
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import { test, expect } from '@playwright/test'
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test.describe('User Authentication Flow', () => {
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test('user can sign up with valid credentials', async ({ page }) => {
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await page.goto('/signup')
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// Fill form using accessible selectors
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await page.getByRole('textbox', { name: /email/i }).fill('user@example.com')
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await page.getByRole('textbox', { name: /password/i }).fill('SecurePass123!')
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await page.getByRole('textbox', { name: /confirm password/i }).fill('SecurePass123!')
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// Submit form
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await page.getByRole('button', { name: /sign up/i }).click()
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// Verify success
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await expect(page).toHaveURL(/\/dashboard/)
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await expect(page.getByRole('heading', { name: /welcome/i })).toBeVisible()
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})
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test('shows validation errors for invalid email', async ({ page }) => {
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await page.goto('/signup')
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await page.getByRole('textbox', { name: /email/i }).fill('invalid-email')
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await page.getByRole('button', { name: /sign up/i }).click()
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await expect(page.getByText(/valid email/i)).toBeVisible()
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})
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})
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```
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### Page Object Model Example
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```typescript
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// pages/SignupPage.ts
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import { Page, Locator } from '@playwright/test'
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export class SignupPage {
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readonly page: Page
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readonly emailInput: Locator
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readonly passwordInput: Locator
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readonly confirmPasswordInput: Locator
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readonly submitButton: Locator
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constructor(page: Page) {
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this.page = page
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this.emailInput = page.getByRole('textbox', { name: /email/i })
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this.passwordInput = page.getByRole('textbox', { name: /^password$/i })
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this.confirmPasswordInput = page.getByRole('textbox', { name: /confirm password/i })
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this.submitButton = page.getByRole('button', { name: /sign up/i })
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}
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async goto() {
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await this.page.goto('/signup')
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}
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async signup(email: string, password: string) {
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await this.emailInput.fill(email)
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await this.passwordInput.fill(password)
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await this.confirmPasswordInput.fill(password)
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await this.submitButton.click()
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}
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}
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// Usage in test
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test('user can sign up', async ({ page }) => {
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const signupPage = new SignupPage(page)
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await signupPage.goto()
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await signupPage.signup('user@example.com', 'SecurePass123!')
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await expect(page).toHaveURL(/\/dashboard/)
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})
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```
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### Accessibility Testing
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```typescript
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import { test, expect } from '@playwright/test'
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import AxeBuilder from '@axe-core/playwright'
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test('checkout page should not have accessibility violations', async ({ page }) => {
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await page.goto('/checkout')
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const accessibilityScanResults = await new AxeBuilder({ page }).analyze()
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expect(accessibilityScanResults.violations).toEqual([])
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})
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test('navigation works with keyboard only', async ({ page }) => {
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await page.goto('/')
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// Tab through navigation
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await page.keyboard.press('Tab')
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await expect(page.getByRole('link', { name: /home/i })).toBeFocused()
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await page.keyboard.press('Tab')
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await expect(page.getByRole('link', { name: /about/i })).toBeFocused()
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// Activate link with Enter
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await page.keyboard.press('Enter')
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await expect(page).toHaveURL(/\/about/)
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})
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```
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### API Mocking
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```typescript
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test('displays products from API', async ({ page }) => {
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// Mock API response
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await page.route('**/api/products', async route => {
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await route.fulfill({
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status: 200,
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contentType: 'application/json',
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body: JSON.stringify([
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{ id: 1, name: 'Product 1', price: 29.99 },
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{ id: 2, name: 'Product 2', price: 39.99 }
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])
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})
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})
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await page.goto('/products')
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await expect(page.getByText('Product 1')).toBeVisible()
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await expect(page.getByText('Product 2')).toBeVisible()
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})
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```
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### Authentication Setup
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```typescript
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// auth.setup.ts
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import { test as setup } from '@playwright/test'
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const authFile = 'playwright/.auth/user.json'
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setup('authenticate', async ({ page }) => {
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await page.goto('/login')
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await page.getByRole('textbox', { name: /email/i }).fill('user@example.com')
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await page.getByRole('textbox', { name: /password/i }).fill('password123')
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await page.getByRole('button', { name: /log in/i }).click()
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await page.waitForURL('/dashboard')
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// Save authentication state
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await page.context().storageState({ path: authFile })
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})
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// Use in tests
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test.use({ storageState: authFile })
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```
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## File Structure
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```
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tests/
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├── e2e/
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│ ├── auth/
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│ │ ├── signup.spec.ts
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│ │ └── login.spec.ts
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│ ├── checkout/
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│ │ └── checkout-flow.spec.ts
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│ └── navigation/
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│ └── main-nav.spec.ts
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├── fixtures/
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│ ├── auth.ts
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│ └── data.ts
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├── pages/
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│ ├── SignupPage.ts
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│ ├── LoginPage.ts
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│ └── DashboardPage.ts
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└── utils/
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├── test-helpers.ts
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└── mock-data.ts
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```
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## Playwright Configuration Example
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```typescript
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// playwright.config.ts
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import { defineConfig, devices } from '@playwright/test'
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export default defineConfig({
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testDir: './tests/e2e',
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fullyParallel: true,
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forbidOnly: !!process.env.CI,
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retries: process.env.CI ? 2 : 0,
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workers: process.env.CI ? 1 : undefined,
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reporter: 'html',
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use: {
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baseURL: 'http://localhost:3000',
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trace: 'on-first-retry',
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screenshot: 'only-on-failure',
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},
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projects: [
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{
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name: 'setup',
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testMatch: /.*\.setup\.ts/,
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},
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{
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name: 'chromium',
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use: { ...devices['Desktop Chrome'] },
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dependencies: ['setup'],
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},
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{
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name: 'firefox',
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use: { ...devices['Desktop Firefox'] },
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dependencies: ['setup'],
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},
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{
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name: 'webkit',
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use: { ...devices['Desktop Safari'] },
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dependencies: ['setup'],
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},
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{
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name: 'Mobile Chrome',
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use: { ...devices['Pixel 5'] },
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dependencies: ['setup'],
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},
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],
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webServer: {
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command: 'npm run dev',
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url: 'http://localhost:3000',
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reuseExistingServer: !process.env.CI,
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},
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})
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```
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## Test Checklist
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For each critical user flow, ensure tests cover:
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- [ ] Happy path (successful completion)
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- [ ] Error handling (validation, network errors)
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- [ ] Edge cases (empty states, long content)
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- [ ] Accessibility (keyboard navigation, ARIA)
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- [ ] Mobile responsiveness
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- [ ] Loading states
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- [ ] Authentication flows
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- [ ] Cross-browser compatibility
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## Common Test Scenarios
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1. **Authentication Flows**: Login, signup, logout, password reset
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2. **Forms**: Validation, submission, error handling
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3. **Navigation**: Links, routing, breadcrumbs
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4. **E-commerce**: Product browsing, cart, checkout
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5. **Data Tables**: Sorting, filtering, pagination
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6. **Modals/Dialogs**: Open, close, form submission
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7. **File Uploads**: Single/multiple files, drag-and-drop
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8. **Real-time Updates**: WebSocket connections, polling
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## Security Testing Considerations
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- Test authentication boundaries
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- Verify protected routes
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- Check XSS prevention
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- Test CSRF protection
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- Validate input sanitization
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- Test rate limiting (if applicable)
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## CI/CD Integration
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```yaml
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# Example GitHub Actions workflow
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name: Playwright Tests
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on:
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push:
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branches: [ main, dev ]
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pull_request:
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branches: [ main ]
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jobs:
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test:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v3
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- uses: actions/setup-node@v3
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with:
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node-version: 18
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- name: Install dependencies
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run: npm ci
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- name: Install Playwright Browsers
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run: npx playwright install --with-deps
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- name: Run Playwright tests
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run: npx playwright test
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- uses: actions/upload-artifact@v3
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if: always()
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with:
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name: playwright-report
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path: playwright-report/
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retention-days: 30
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```
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## Output Format
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When generating E2E tests, provide:
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1. Complete test files with proper imports
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2. Page Object Models if multiple tests use same pages
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3. Test fixtures and utilities as needed
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4. Playwright configuration if not present
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5. Clear comments explaining complex interactions
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6. Instructions for running the tests
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7. CI/CD integration suggestions
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## Getting Started
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Ask the user: "What user flow or feature would you like to create E2E tests for?"
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Once you understand the requirements, use the Playwright MCP tools to:
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1. Navigate to the relevant pages
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2. Analyze the page structure
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3. Generate appropriate test code
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4. Verify accessibility
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5. Create comprehensive test coverage
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