Addresses the "no automated test suite" gap. Chose Node's built-in test runner
via tsx rather than vitest: the project is on Vite 8.0.14, ahead of vitest's
supported Vite range, so vitest would fight peer deps. tsx is build-independent.
- `npm test` → `node --import tsx --test $(find src -name '*.test.ts')` (works on
Node 20 local + 24 CI without relying on --test glob support).
- src/app/utils/common.test.ts: 15 tests covering the pure helpers (bytesToSize,
time formatters, binarySearch, parseGeoUri, slash trimmers, nameInitials,
randomStr, suffixRename, splitWithSpace, promise-settled helpers, etc.) —
asserts actual behavior, traced from source.
- common.ts: folds import made `import type` (it's types only) so the module is
pure and testable without loading folds/CSS.
- tsconfig excludes *.test.ts (tsx transpiles tests; eslint isn't type-aware so
it still lints them); added an informational CI "Unit tests" step (promote to a
hard gate by dropping continue-on-error).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
jaredandClaude Opus 4.8
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