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Web application testing principles. E2E, Playwright, deep audit strategies.
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Based on SOC occupation classification
Design thinking and decision-making for web UI. Use when designing components, layouts, color schemes, typography, or creating aesthetic interfaces. Teaches principles, not fixed values.
Automatic quality control, linting, and static analysis procedures. Use after every code modification to ensure syntax correctness and project standards. Triggers onKeywords: lint, format, check, validate, types, static analysis.
React and Next.js performance optimization from Vercel Engineering. Use when building React components, optimizing performance, eliminating waterfalls, reducing bundle size, reviewing code for performance issues, or implementing server/client-side optimizations.
Testing patterns and principles. Unit, integration, mocking strategies.
| name | webapp-testing |
| description | Web application testing principles. E2E, Playwright, deep audit strategies. |
| allowed-tools | Read, Write, Edit, Glob, Grep, Bash |
Discover and test everything. Leave no route untested.
Execute these for automated browser testing:
| Script | Purpose | Usage |
|---|---|---|
scripts/playwright_runner.py | Basic browser test | python scripts/playwright_runner.py https://example.com |
| With screenshot | python scripts/playwright_runner.py <url> --screenshot | |
| Accessibility check | python scripts/playwright_runner.py <url> --a11y |
Requires: pip install playwright && playwright install chromium
| Target | How to Find |
|---|---|
| Routes | Scan app/, pages/, router files |
| API endpoints | Grep for HTTP methods |
| Components | Find component directories |
| Features | Read documentation |
/\ E2E (Few)
/ \ Critical user flows
/----\
/ \ Integration (Some)
/--------\ API, data flow
/ \
/------------\ Component (Many)
Individual UI pieces
| Priority | Tests |
|---|---|
| 1 | Happy path user flows |
| 2 | Authentication flows |
| 3 | Critical business actions |
| 4 | Error handling |
| Practice | Why |
|---|---|
| Use data-testid | Stable selectors |
| Wait for elements | Avoid flaky tests |
| Clean state | Independent tests |
| Avoid implementation details | Test user behavior |
| Concept | Use |
|---|---|
| Page Object Model | Encapsulate page logic |
| Fixtures | Reusable test setup |
| Assertions | Built-in auto-wait |
| Trace Viewer | Debug failures |
| Setting | Recommendation |
|---|---|
| Retries | 2 on CI |
| Trace | on-first-retry |
| Screenshots | on-failure |
| Video | retain-on-failure |
| Scenario | Value |
|---|---|
| Design system | High |
| Marketing pages | High |
| Component library | Medium |
| Dynamic content | Lower |
| Area | Tests |
|---|---|
| Status codes | 200, 400, 404, 500 |
| Response shape | Matches schema |
| Error messages | User-friendly |
| Edge cases | Empty, large, special chars |
tests/
├── e2e/ # Full user flows
├── integration/ # API, data
├── component/ # UI units
└── fixtures/ # Shared data
| Pattern | Example |
|---|---|
| Feature-based | login.spec.ts |
| Descriptive | user-can-checkout.spec.ts |
| Strategy | Use |
|---|---|
| Per file | Playwright default |
| Sharding | Large suites |
| Workers | Multiple browsers |
| ❌ Don't | ✅ Do |
|---|---|
| Test implementation | Test behavior |
| Hardcode waits | Use auto-wait |
| Skip cleanup | Isolate tests |
| Ignore flaky tests | Fix root cause |
Remember: E2E tests are expensive. Use them for critical paths only.