Set up Vitest for unit and component testing #13
Description
User Story
As a fellow engineer, I want unit and component testing with Vitest so that I can validate logic and UI behavior without relying only on manual QA.
Context
Vitest should be part of the project's modern development loop. This issue should introduce a clean baseline for writing and running tests in the React codebase.
Acceptance Criteria
- Vitest is configured and documented
- At least a few representative tests exist for shared logic and UI components
- Test utilities are organized so future tests are easy to write
- Tests run locally and in CI
- The setup supports React component testing patterns cleanly
Notes
- Favor clear testing conventions over maximal configuration
- Good examples matter here because fellows will copy the first tests they see
- Keep mocking strategy understandable
Out of Scope
- Full coverage goals
- Browser E2E tests
Size
Medium