Source Code added

web/src/lib/i18n.spec.ts

@@ -0,0 +1,55 @@
+import { langs } from '$lib/constants';
+import { getClosestAvailableLocale } from '$lib/utils/i18n';
+import { readFileSync, readdirSync } from 'node:fs';
+
+describe('i18n', () => {
+  describe('loaders', () => {
+    const languageFiles = readdirSync('../i18n').sort();
+    for (const filename of languageFiles) {
+      test(`${filename} should have a loader`, async () => {
+        if (!filename.endsWith('.json') || filename == 'package.json') {
+          return;
+        }
+
+        const code = filename.replaceAll('.json', '');
+        const item = langs.find((lang) => lang.weblateCode === code || lang.code === code);
+        expect(item, `${filename} has no loader`).toBeDefined();
+        if (!item) {
+          return;
+        }
+
+        // verify it loads the right file
+        const module: { default?: unknown } = await item.loader();
+        const translations = JSON.stringify(module.default, null, 2).trim();
+        const content = readFileSync(`../i18n/${filename}`).toString().trim();
+        expect(translations === content, `${item.name} did not load ${filename}`).toEqual(true);
+      });
+    }
+  });
+
+  describe('getClosestAvailableLocale', () => {
+    const allLocales = ['ar', 'bg', 'en', 'en-US', 'en-DE', 'zh-Hans', 'zh-Hans-HK'];
+
+    it('returns undefined on mismatch', () => {
+      expect(getClosestAvailableLocale([], allLocales)).toBeUndefined();
+      expect(getClosestAvailableLocale(['invalid'], allLocales)).toBeUndefined();
+    });
+
+    it('returns the first matching locale', () => {
+      expect(getClosestAvailableLocale(['invalid', 'ar', 'bg'], allLocales)).toBe('ar');
+      expect(getClosestAvailableLocale(['bg'], allLocales)).toBe('bg');
+      expect(getClosestAvailableLocale(['bg', 'invalid', 'ar'], allLocales)).toBe('bg');
+    });
+
+    it('returns the locale for a less specific match', () => {
+      expect(getClosestAvailableLocale(['ar-AE'], allLocales)).toBe('ar-AE');
+      expect(getClosestAvailableLocale(['ar-AE', 'en'], allLocales)).toBe('ar-AE');
+      expect(getClosestAvailableLocale(['zh-Hans-HK', 'zh-Hans'], allLocales)).toBe('zh-Hans-HK');
+    });
+
+    it('ignores the locale for a more specific match', () => {
+      expect(getClosestAvailableLocale(['zh'], allLocales)).toBeUndefined();
+      expect(getClosestAvailableLocale(['de', 'zh', 'en-US'], allLocales)).toBe('en-US');
+    });
+  });
+});