designing-testslisted

# Designing Tests ### When to Load - **Trigger**: Adding tests, test strategy planning, improving coverage, setting up testing infrastructure - **Skip**: Non-test code changes where testing is not part of the task ## Test Implementation Workflow Copy this checklist and track progress: ``` Test Implementation Progress: - [ ] Step 1: Identify what to test - [ ] Step 2: Select appropriate test type - [ ] Step 3: Write tests following templates - [ ] Step 4: Run tests and verify passing - [ ] Step 5: Check coverage meets targets - [ ] Step 6: Fix any failing tests ``` ## Testing Pyramid Apply the testing pyramid for balanced coverage: ``` /\ / \ E2E Tests (10%) /----\ - Critical user journeys / \ - Slow but comprehensive /--------\ Integration Tests (20%) / \ - Component interactions /------------\ - API contracts / \ Unit Tests (70%) /________________\ - Fast, isolated - Business logic focus ``` ## Framework Selection ### JavaScript/TypeScript | Type | Recommended | Alternative | | ----------- | --------------- | ---------------- | | Unit | Vitest | Jest | | Integration | Vitest + MSW | Jest + SuperTest | | E2E | Playwright | Cypress | | Component | Testing Library | Enzyme | ### Python | Type | Recommended | Alternative | | ----------- | ---------------------------