e9f5a48f2d0076a6cad41cb24d4e8a79ad008dec
Set up Vitest for both server (Node + Supertest) and client (jsdom + React Testing Library). Extract Express app into app.js for testability. Add example tests covering bills validation, bills route CRUD, ThemeContext, and App nav rendering. Update CLAUDE.md with testing docs and requirement to write tests with features. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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