Major testing infrastructure upgrade from manual mocks to Mock Service Worker (MSW):
New MSW infrastructure (tests/msw/):
- Add state.ts: In-memory state manager with full CRUD operations
- Manage providers and current selections per app type (Claude/Codex)
- Auto-switch current provider when deleted
- Deep clone to prevent reference pollution
- Add handlers.ts: HTTP request handlers for 10 Tauri API endpoints
- Mock get_providers, switch_provider, add/update/delete_provider
- Mock update_sort_order, update_tray_menu, import_default_config
- Support error scenarios (404 for non-existent providers)
- Add tauriMocks.ts: Tauri API mock layer
- Transparently convert invoke() calls to HTTP requests
- Mock event listener system with emitTauriEvent helper
- Use cross-fetch for Node.js environment
- Add server.ts: MSW server setup for Node.js test environment
Refactor App.test.tsx (-170 lines, -43%):
- Remove 23 manual mocks (useProvidersQuery, useProviderActions, etc.)
- Run real hooks with MSW-backed API calls instead of mock implementations
- Test real state changes instead of mock call counts
- Add comprehensive flow: duplicate → create → edit → delete → event listening
- Verify actual provider list changes and current selection updates
Setup integration:
- Add MSW server lifecycle to tests/setupTests.ts
- Start server before all tests
- Reset handlers and state after each test
- Close server after all tests complete
- Clear all mocks in afterEach for test isolation
Dependencies:
- Add msw@^2.11.6 for API mocking
- Add cross-fetch@^4.1.0 for fetch polyfill in Node.js
Type fixes:
- Add missing imports (AppType, Provider) in handlers.ts
- Fix HttpResponse.json generic constraint with as any (MSW best practice)
- Change invalid category "default" to "official" in state.ts
Test results: All 50 tests passing across 8 files, 0 TypeScript errors
