Implement Phase 8: Testing & Deployment

Testing Infrastructure:
- Configure Jest with Next.js integration and TypeScript support
- Add React Testing Library with proper setup for Next.js components
- Install and configure Playwright for E2E testing
- Create jest.setup.ts with mocks for Next.js router and browser APIs
- Add CSS module mocking with identity-obj-proxy

Unit Tests:
- Create LoadingFallback component tests covering all 5 variants
- Create tracking API tests for data transformation logic
- Test createActivity, getActivities data structure conversions
- Verify frontend (timestamp/data) to backend (startedAt/metadata) mapping

E2E Tests (Playwright):
- Create comprehensive tracking flow tests
- Test navigation to all tracker pages (feeding, sleep, diaper)
- Test homepage Today's Summary display
- Test AI Assistant and Analytics navigation
- Test feeding, sleep, and diaper tracker UI elements
- Configure multi-browser testing (Chrome, Firefox, Safari, Mobile)

CI/CD Pipeline (GitHub Actions):
- Create automated CI/CD workflow for master/main branches
- Run linting on every push and PR
- Execute unit tests with coverage reporting
- Run E2E tests (Chromium) in CI environment
- Build application and upload artifacts
- Upload test coverage to Codecov
- Upload Playwright test reports as artifacts

Test Scripts:
- npm test: Run Jest unit tests
- npm run test⌚ Run tests in watch mode
- npm run test:coverage: Generate coverage report
- npm run test:e2e: Run Playwright E2E tests
- npm run test:e2e:ui: Run E2E tests with UI mode
- npm run test:e2e:headed: Run E2E tests in headed mode

Documentation:
- Create comprehensive testing guide (tests/README.md)
- Document test structure and best practices
- Add troubleshooting section for common issues
- Include useful commands for debugging tests

Coverage Thresholds:
- Branches: 70%
- Functions: 70%
- Lines: 70%
- Statements: 70%

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

maternal-web/package.json

@@ -9,7 +9,10 @@
     "lint": "next lint",
     "test": "jest",
     "test:watch": "jest --watch",
-    "test:coverage": "jest --coverage"
+    "test:coverage": "jest --coverage",
+    "test:e2e": "playwright test",
+    "test:e2e:ui": "playwright test --ui",
+    "test:e2e:headed": "playwright test --headed"
   },
   "dependencies": {
     "@emotion/react": "^11.14.0",
@@ -39,6 +42,7 @@
   },
   "devDependencies": {
     "@axe-core/react": "^4.10.2",
+    "@playwright/test": "^1.55.1",
     "@testing-library/jest-dom": "^6.9.0",
     "@testing-library/react": "^16.3.0",
     "@testing-library/user-event": "^14.6.1",
@@ -46,11 +50,13 @@
     "@types/node": "^20",
     "@types/react": "^18",
     "@types/react-dom": "^18",
+    "identity-obj-proxy": "^3.0.0",
     "jest": "^30.2.0",
     "jest-axe": "^10.0.0",
     "jest-environment-jsdom": "^30.2.0",
     "postcss": "^8",
     "tailwindcss": "^3.4.1",
+    "ts-jest": "^29.4.4",
     "typescript": "^5"
   }
 }