blog locale

v3/tests/blog-i18n.test.mjs

@@ -0,0 +1,73 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+
+import {
+  buildPostAlternates,
+  findTranslatedPost,
+  groupPostsByTranslationKey,
+  localizedPath,
+  validatePostTranslations,
+} from '../src/utils/blog-i18n.mjs';
+
+const posts = [
+  {
+    lang: 'en',
+    translationKey: 'acl-1-5',
+    slug: 'acl',
+    permalink: 'blog/2025/02/acl',
+  },
+  {
+    lang: 'zh-cn',
+    translationKey: 'acl-1-5',
+    slug: '增强-acl',
+    permalink: 'zh-cn/blog/2025/02/增强-acl',
+  },
+];
+
+test('groups and resolves translations by stable key', () => {
+  assert.equal(groupPostsByTranslationKey(posts).get('acl-1-5').length, 2);
+  assert.equal(findTranslatedPost(posts[0], posts, 'zh-cn'), posts[1]);
+});
+
+test('builds localized and default-locale paths', () => {
+  assert.equal(localizedPath('en', 'blog'), '/blog');
+  assert.equal(localizedPath('ja', 'blog'), '/ja/blog');
+  assert.equal(localizedPath('zh-cn', 'blog/2025/02/增强-acl'), '/zh-cn/blog/2025/02/增强-acl');
+});
+
+test('reports missing locales and duplicate locale entries', () => {
+  assert.throws(() => validatePostTranslations(posts, ['en', 'zh-cn', 'de']), /missing locale de/i);
+  assert.throws(
+    () => validatePostTranslations([...posts, { ...posts[0], slug: 'acl-copy' }], ['en', 'zh-cn']),
+    /duplicate locale en/i
+  );
+});
+
+test('rejects unsupported locales and duplicate slugs in one locale', () => {
+  assert.throws(() => validatePostTranslations([{ ...posts[0], lang: 'xx' }], ['en']), /unsupported locale xx/i);
+  assert.throws(
+    () =>
+      validatePostTranslations(
+        [
+          { ...posts[0], translationKey: 'a', slug: 'same' },
+          { ...posts[0], translationKey: 'b', slug: 'same' },
+        ],
+        ['en']
+      ),
+    /duplicate slug same/i
+  );
+});
+
+test('rejects a locale that does not match the content directory', () => {
+  assert.throws(
+    () => validatePostTranslations([{ ...posts[0], id: 'zh-cn/acl.md' }], ['en', 'zh-cn']),
+    /directory zh-cn does not match locale en/i
+  );
+});
+
+test('builds alternate links from actual translated permalinks', () => {
+  assert.deepEqual(buildPostAlternates(posts[0], posts, ['en', 'zh-cn']), [
+    { lang: 'en', path: '/blog/2025/02/acl' },
+    { lang: 'zh-cn', path: '/zh-cn/blog/2025/02/增强-acl' },
+  ]);
+});