lchenrique/politron-ide
api-patterns
API design principles and decision-making. REST vs GraphQL vs tRPC selection, response formats, versioning, pagination.
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Web App Testing
webapp-testing
Web application testing principles. E2E, Playwright, deep audit strategies.
SKILL.md
Full skill instructions
Web App Testing
Discover and test everything. Leave no route untested.
🔧 Runtime Scripts
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
1. Deep Audit Approach
Discovery First
| Target | How to Find |
|---|---|
| Routes | Scan app/, pages/, router files |
| API endpoints | Grep for HTTP methods |
| Components | Find component directories |
| Features | Read documentation |
Systematic Testing
- Map - List all routes/APIs
- Scan - Verify they respond
- Test - Cover critical paths
2. Testing Pyramid for Web
/\ E2E (Few)
/ \ Critical user flows
/----\
/ \ Integration (Some)
/--------\ API, data flow
/ \
/------------\ Component (Many)
Individual UI pieces
3. E2E Test Principles
What to Test
| Priority | Tests |
|---|---|
| 1 | Happy path user flows |
| 2 | Authentication flows |
| 3 | Critical business actions |
| 4 | Error handling |
E2E Best Practices
| Practice | Why |
|---|---|
| Use data-testid | Stable selectors |
| Wait for elements | Avoid flaky tests |
| Clean state | Independent tests |
| Avoid implementation details | Test user behavior |
4. Playwright Principles
Core Concepts
| Concept | Use |
|---|---|
| Page Object Model | Encapsulate page logic |
| Fixtures | Reusable test setup |
| Assertions | Built-in auto-wait |
| Trace Viewer | Debug failures |
Configuration
| Setting | Recommendation |
|---|---|
| Retries | 2 on CI |
| Trace | on-first-retry |
| Screenshots | on-failure |
| Video | retain-on-failure |
5. Visual Testing
When to Use
| Scenario | Value |
|---|---|
| Design system | High |
| Marketing pages | High |
| Component library | Medium |
| Dynamic content | Lower |
Strategy
- Baseline screenshots
- Compare on changes
- Review visual diffs
- Update intentional changes
6. API Testing Principles
Coverage Areas
| Area | Tests |
|---|---|
| Status codes | 200, 400, 404, 500 |
| Response shape | Matches schema |
| Error messages | User-friendly |
| Edge cases | Empty, large, special chars |
7. Test Organization
File Structure
tests/
├── e2e/ # Full user flows
├── integration/ # API, data
├── component/ # UI units
└── fixtures/ # Shared data
Naming Convention
| Pattern | Example |
|---|---|
| Feature-based | login.spec.ts |
| Descriptive | user-can-checkout.spec.ts |
8. CI Integration
Pipeline Steps
- Install dependencies
- Install browsers
- Run tests
- Upload artifacts (traces, screenshots)
Parallelization
| Strategy | Use |
|---|---|
| Per file | Playwright default |
| Sharding | Large suites |
| Workers | Multiple browsers |
9. Anti-Patterns
| ❌ 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.
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