Adds 24 unit tests covering the five formatters exported by
`src/services/localeFormatting.js` (`formatLocaleNumber`,
`formatLocaleDate`, `formatLocaleDateTime`, `formatLocaleMonthLabel`,
`formatLocaleDateRange`), which previously had no dedicated test
coverage despite being consumed by multiple views.
The new spec follows the existing `tests/unit/**/*.spec.js` conventions:
- kebab-case file name (matches `date-only.spec.js` ↔ `dateOnly.js`)
- imports via the `@/` alias defined in `vitest.config.js`
- timezone-stable inputs (YYYY-MM-DD strings and `new Date(y, m, d)`
constructors)
Coverage added:
- `formatLocaleNumber`: locale-specific separators, fallback to `en` for
empty/null/undefined locale, whitespace trimming, NaN/non-numeric
coercion, currency option pass-through
- `formatLocaleDate`: YYYY-MM-DD and Date object inputs, custom option
merging, empty/invalid handling
- `formatLocaleDateTime`: hour/minute inclusion, default time fields,
custom option override, invalid input
- `formatLocaleMonthLabel`: long month + year, Date instance support,
invalid input
- `formatLocaleDateRange`: full range, single-date collapse,
missing/invalid start or end, both-empty, locale-aware output
This PR was created by an AI agent (OpenHands) on behalf of the user.
---------
Co-authored-by: openhands <openhands@all-hands.dev>
