I18n

Tests for validating translation files and i18n functionality.

Internationalization (i18n) Tests

Tests for validating translation files and i18n functionality.

Translation Consistency Tests

File: translation-consistency.test.ts

Validates that all locale files (src/locales/*.json) have consistent keys with the English source file (en.json). This prevents runtime errors when users switch languages.

What it checks

• All non-English locale files have the same keys as en.json
• No extra keys exist in non-English locales
• No missing keys in non-English locales
• All locale files are valid JSON

Why this matters

If es.json is missing a key that exists in en.json, users who switch to Spanish will see:

• Untranslated keys appearing in the UI
• Runtime errors from next-intl
• Broken user experience

This test catches these issues before they reach production.

Usage

# Run i18n tests
bun run test src/__tests__/i18n/

# Run specific test
bun run test src/__tests__/i18n/translation-consistency.test.ts

Adding new locale files

When adding a new locale:

1. Copy src/locales/en.json to src/locales/{locale-code}.json
2. Translate all values (keep keys identical)
3. Run tests to verify consistency: bun run test src/__tests__/i18n/
4. Add the locale to src/components/i18n/language-selector.tsx