designing-tests

1# Designing Tests
2 
3### When to Load
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5- **Trigger**: Adding tests, test strategy planning, improving coverage, setting up testing infrastructure
6- **Skip**: Non-test code changes where testing is not part of the task
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8## Test Implementation Workflow
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10Copy this checklist and track progress:
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12```
13Test Implementation Progress:
14- [ ] Step 1: Identify what to test
15- [ ] Step 2: Select appropriate test type
16- [ ] Step 3: Write tests following templates
17- [ ] Step 4: Run tests and verify passing
18- [ ] Step 5: Check coverage meets targets
19- [ ] Step 6: Fix any failing tests
20```
21 
22## Testing Pyramid
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24Apply the testing pyramid for balanced coverage:
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26```
27        /\
28       /  \     E2E Tests (10%)
29      /----\    - Critical user journeys
30     /      \   - Slow but comprehensive
31    /--------\  Integration Tests (20%)
32   /          \ - Component interactions
33  /------------\ - API contracts
34 /              \ Unit Tests (70%)
35/________________\ - Fast, isolated
36                   - Business logic focus
37```
38 
39## Framework Selection
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41### JavaScript/TypeScript
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43| Type        | Recommended     | Alternative         |
44| ----------- | --------------- | ------------------- |
45| Unit        | Vitest          | Jest                |
46| Integration | Vitest + MSW    | Jest + SuperTest    |
47| E2E         | Playwright      | Cypress             |
48| Component   | Testing Library | Vitest Browser Mode |
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50### Python
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52| Type        | Recommended                 | Alternative       |
53…