carmanagement/apps/homepage/tests/unit/localization.test.ts

import {
  getDirection,
  hreflangMap,
  isLocale,
  localeFromAcceptLanguage,
  localeSwitchUrl,
  localizedPath,
  routeById,
  routeIdFromAnyLocaleSlug,
  routeIdFromPathname,
  routeIdFromSlug,
} from '@/lib/localization/config';
import { describe, expect, it } from 'vitest';

describe('localization foundations', () => {
  it('selects a supported locale by quality', () => {
    expect(localeFromAcceptLanguage('de-DE;q=0.9, ar;q=0.8, fr;q=0.7')).toBe('ar');
    expect(localeFromAcceptLanguage('fr-CA, en;q=0.8')).toBe('fr');
    expect(localeFromAcceptLanguage(null)).toBe('en');
  });

  it('validates locale direction and route lookup', () => {
    expect(isLocale('fr')).toBe(true);
    expect(isLocale('de')).toBe(false);
    expect(getDirection('ar')).toBe('rtl');
    expect(routeById('home').id).toBe('home');
  });

  it('generates and resolves localized stable route paths', () => {
    expect(localizedPath('home', 'ar')).toBe('/ar/system');
    expect(localizedPath('privacy', 'fr')).toBe('/fr/system/confidentialite');
    expect(localizedPath('sign-in', 'ar')).toBe('/ar/system/تسجيل-الدخول');
    expect(routeIdFromSlug('fr', 'confidentialite')).toBe('privacy');
    expect(routeIdFromSlug('fr', 'privacy')).toBeNull();
    expect(routeIdFromAnyLocaleSlug('privacy')).toBe('privacy');
    expect(routeIdFromAnyLocaleSlug('confidentialite')).toBe('privacy');
    expect(routeIdFromAnyLocaleSlug('unknown')).toBeNull();
    expect(
      routeIdFromPathname('/ar/system/%D8%A7%D9%84%D8%AE%D8%B5%D9%88%D8%B5%D9%8A%D8%A9'),
    ).toBe('privacy');
    expect(routeIdFromPathname('/de')).toBeNull();
  });

  it('generates reciprocal hreflang values', () => {
    const links = hreflangMap(new URL('https://approved.test'), 'home');
    expect(links.en).toBe('https://approved.test/en/system');
    expect(links.ar).toBe('https://approved.test/ar/system');
    expect(links['x-default']).toBe('https://approved.test/en/system');
  });

  it('preserves only approved campaign query values and valid hashes', () => {
    const current = new URL(
      'https://approved.test/en/system?utm_source=campaign&email=private%40approved.test#gibberish',
    );
    const switched = localeSwitchUrl(current, 'fr', 'home');
    expect(switched.pathname).toBe('/fr/system');
    expect(switched.search).toBe('?utm_source=campaign');
    expect(switched.hash).toBe('');

    current.hash = '#workflow';
    expect(localeSwitchUrl(current, 'ar', 'home').hash).toBe('#workflow');
  });
});