- Introduce Vitest + React Testing Library + jsdom environment - Add useDragSort hook unit tests covering: * Sorting logic (sortIndex → createdAt → name) * Successful drag operation (API call + cache invalidation) * Failed drag operation (error toast display) * Edge case (no valid target, no API call) - Configure global test setup (i18n mock, auto cleanup) - Update TypeScript configs to include tests/ directory - Add test development plan documentation Test Coverage: ✓ Provider drag-and-drop sorting core logic ✓ React Query cache refresh ✓ Toast notification display ✓ Boundary condition handling Test Results: 4/4 passed (671ms) Next Steps: Sprint 2 - component tests with MSW mock layer
609 B
609 B