Building a Playwright E2E Test Harness for AI Agents

🎬 Video Summary

Speaker: Naver Financial FE Member Date: June 15, 2026 Views: 3,020

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1. The Need for AI Agent Testing
   • Verification of code written by AI
   • Importance of Playwright-based E2E testing
   • Validation in real browser environments
2. Advantages of Playwright Testing
   • Validation at the user experience level
   • Test code serving as a specification document
   • Rich report generation
3. Test Construction Process
   • Selecting test scope
   • Utilizing Playwright codegen tools
   • Building an AI agent auxiliary system
4. Real-world Application Cases
   • NaverPay service test case
   • Handling external dependencies
   • Strategies to prevent intermittent failures
5. Building a Self-improving Loop
   • Automation from test writing to debugging
   • CI/CD integration
   • Automatic correction system for failed tests

##

1. The Importance of AI Agent Testing

• Code written by AI requires verification
• Unit tests are insufficient
• Need for validation at the user experience level

2. The Role of Playwright

// Example: Playwright test code
const { test, expect } = require('@playwright/test');

test('Access event page after login', async ({ page }) => {
  await page.goto('https://example.com/login');
  await page.fill('#username', 'testuser');
  await page.fill('#password', 'password123');
  await page.click('#login-button');

  // Confirm access to event page
  await expect(page).toHaveURL(/events/);
  await expect(page.locator('.event-list')).toBeVisible();
});
### 3. Test Construction Strategy

1. **Selecting Core User Flows**
   - Home → Terms of Service → Mobile Authentication → Result Inquiry
   - Product List → Details → Application Flow

2. **Handling External Dependencies**
   - API calls → Fixed response return
   - Authentication system → Setting test state beforehand

3. **Preventing Intermittent Failures**
   - Using conditional waits
   - Applying semantic selectors
   - Repeating test execution

### 4. Building a Self-improving Loop

```mermaid
graph TD
    A[Test Planning] --> B[Code Generation]
    B --> C[Execution and Verification]
    C -->|Success| D[Completion]
    C -->|Failure| E[Debugging]
    E --> F[Correction]
    F --> B

💡 Practical Tips

1. Test Writing Guidelines
   • Each test should be executable independently
   • State setup should be handled via API calls
   • External dependencies should use fixed responses
2. Debugging Strategies
   • Utilizing Playwright trace viewer
   • Checking the network tab
   • Recording screenshots and videos
3. CI/CD Integration
   • Blocking PRs on test failure
   • Automating failure cause analysis
   • Storing test result artifacts

📅 Storage Path

• ~/obsidian-vault/vivaura/sources/research/2026-06-15-playwright.md