Day 20: AI-Assisted Playwright — Codegen, MCP, and Claude Code
This is Day 20 of the 21-Day Playwright with TypeScript Challenge. One lesson per day. Zero to production-ready in 3 weeks.
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AI accelerates test writing by 50-70%. But only if you use it correctly — scaffolding first, human refinement second.
Contents
Playwright Codegen
# Record browser actions as test code
npx playwright codegen https://your-app.com
# With specific device
npx playwright codegen --device="iPhone 13" https://your-app.comCodegen records clicks, fills, navigations as TypeScript code. Always refactor output: replace CSS selectors with getByRole, add meaningful assertions, extract Page Objects.
Claude Code + CLAUDE.md
# CLAUDE.md for Playwright project
## Test Conventions
- Use getByRole() locators (never XPath, minimize CSS)
- Page Object Model in src/pages/ with .ts extension
- Tests in src/tests/ with .spec.ts extension
- All assertions use expect() (auto-retry)
- Test data created via API fixtures, never hardcoded
- Zero Thread.sleep or waitForTimeout calls🚀 Build Real AI Testing Skills
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AI Workflow: Scaffold, Then Refine
- Generate: Use Codegen or Claude to create initial test structure
- Review: Check locator strategy (semantic > CSS), assertion quality, test independence
- Refine: Add edge cases, negative scenarios, error handling AI missed
- Extract: Move reusable parts to Page Objects and fixtures
- Validate: Run in CI — if it passes headed and headless, ship it
What AI Does Well vs Poorly
| AI Does Well | AI Does Poorly |
|---|---|
| Happy path test scaffolding | Business logic edge cases |
| Locator generation from DOM | Knowing which locator is resilient |
| Boilerplate POM structure | Framework architecture decisions |
| Test data generation | Understanding what data matters |
| Code completion | Test strategy and prioritization |
Tomorrow (Day 21 — FINAL): Capstone project — build production-ready framework and deploy.
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