From f2162c6731a0509ee2fbd660a5eab1d1aa24706b Mon Sep 17 00:00:00 2001
From: Nicolas Varrot <contact@nicolasvarrot.fr>
Date: Fri, 13 Feb 2026 08:42:59 +0000
Subject: [PATCH] test: add i18n and highlight.js test suites (18 cases, 95
 total)

---
 src/lib/__tests__/highlight.test.ts | 64 ++++++++++++++++++++
 src/lib/__tests__/i18n.test.ts      | 90 +++++++++++++++++++++++++++++
 2 files changed, 154 insertions(+)
 create mode 100644 src/lib/__tests__/highlight.test.ts
 create mode 100644 src/lib/__tests__/i18n.test.ts

diff --git a/src/lib/__tests__/highlight.test.ts b/src/lib/__tests__/highlight.test.ts
new file mode 100644
index 0000000..31398d3
--- /dev/null
+++ b/src/lib/__tests__/highlight.test.ts
@@ -0,0 +1,64 @@
+import { describe, it, expect } from 'vitest';
+import hljs, { rehypeHighlightLanguages, rehypeHighlightOptions } from '../highlight';
+
+describe('highlight', () => {
+  const expectedLanguages = [
+    'bash', 'css', 'diff', 'dockerfile', 'go', 'ini',
+    'javascript', 'json', 'markdown', 'python', 'rust',
+    'shell', 'sql', 'typescript', 'xml', 'yaml',
+  ];
+
+  describe('hljs instance', () => {
+    it('has all expected languages registered', () => {
+      const registered = hljs.listLanguages();
+      for (const lang of expectedLanguages) {
+        expect(registered).toContain(lang);
+      }
+    });
+
+    it('resolves common aliases', () => {
+      const aliases = ['sh', 'zsh', 'js', 'jsx', 'ts', 'tsx', 'py', 'html', 'yml', 'rs'];
+      for (const alias of aliases) {
+        const lang = hljs.getLanguage(alias);
+        expect(lang, `alias "${alias}" should resolve`).toBeDefined();
+      }
+    });
+
+    it('highlights JavaScript code', () => {
+      const result = hljs.highlight('const x = 42;', { language: 'javascript' });
+      expect(result.value).toContain('hljs-');
+      expect(result.language).toBe('javascript');
+    });
+
+    it('highlights Python code', () => {
+      const result = hljs.highlight('def hello():\n  pass', { language: 'python' });
+      expect(result.value).toContain('hljs-');
+    });
+
+    it('auto-detects language', () => {
+      const result = hljs.highlightAuto('{"key": "value"}');
+      expect(result.language).toBe('json');
+    });
+  });
+
+  describe('rehypeHighlightLanguages', () => {
+    it('exports all expected languages as functions', () => {
+      for (const lang of expectedLanguages) {
+        expect(typeof rehypeHighlightLanguages[lang]).toBe('function');
+      }
+    });
+  });
+
+  describe('rehypeHighlightOptions', () => {
+    it('has languages and aliases', () => {
+      expect(rehypeHighlightOptions.languages).toBeDefined();
+      expect(rehypeHighlightOptions.aliases).toBeDefined();
+    });
+
+    it('aliases map to valid language names', () => {
+      for (const [lang] of Object.entries(rehypeHighlightOptions.aliases)) {
+        expect(expectedLanguages).toContain(lang);
+      }
+    });
+  });
+});
diff --git a/src/lib/__tests__/i18n.test.ts b/src/lib/__tests__/i18n.test.ts
new file mode 100644
index 0000000..6d0542c
--- /dev/null
+++ b/src/lib/__tests__/i18n.test.ts
@@ -0,0 +1,90 @@
+import { describe, it, expect, afterEach } from 'vitest';
+import { t, getLocale, setLocale, supportedLocales, localeLabels } from '../i18n';
+
+describe('i18n', () => {
+  const originalLocale = getLocale();
+
+  afterEach(() => {
+    setLocale(originalLocale);
+  });
+
+  describe('supportedLocales', () => {
+    it('includes en and fr', () => {
+      expect(supportedLocales).toContain('en');
+      expect(supportedLocales).toContain('fr');
+    });
+
+    it('has labels for all supported locales', () => {
+      for (const loc of supportedLocales) {
+        expect(localeLabels[loc]).toBeDefined();
+        expect(typeof localeLabels[loc]).toBe('string');
+      }
+    });
+  });
+
+  describe('getLocale / setLocale', () => {
+    it('returns a supported locale', () => {
+      expect(supportedLocales).toContain(getLocale());
+    });
+
+    it('switches locale', () => {
+      setLocale('fr');
+      expect(getLocale()).toBe('fr');
+      setLocale('en');
+      expect(getLocale()).toBe('en');
+    });
+  });
+
+  describe('t()', () => {
+    it('returns English strings when locale is en', () => {
+      setLocale('en');
+      expect(t('login.connect')).toBe('Connect');
+    });
+
+    it('returns French strings when locale is fr', () => {
+      setLocale('fr');
+      expect(t('login.connect')).toBe('Connexion');
+    });
+
+    it('returns the key itself for unknown keys', () => {
+      setLocale('en');
+      // Cast to bypass TS — simulates a missing key at runtime
+      const result = t('nonexistent.key' as never);
+      expect(result).toBe('nonexistent.key');
+    });
+
+    it('all en keys have corresponding fr translations', () => {
+      setLocale('en');
+      const enResult = t('login.title');
+      setLocale('fr');
+      const frResult = t('login.title');
+      // Both should return non-empty strings (not the key)
+      expect(enResult.length).toBeGreaterThan(0);
+      expect(frResult.length).toBeGreaterThan(0);
+    });
+  });
+
+  describe('onLocaleChange', () => {
+    it('notifies listeners on locale change', async () => {
+      const { onLocaleChange } = await import('../i18n');
+      let callCount = 0;
+      const unsub = onLocaleChange(() => callCount++);
+
+      setLocale('fr');
+      setLocale('en');
+
+      expect(callCount).toBe(2);
+      unsub();
+    });
+
+    it('unsubscribe stops notifications', async () => {
+      const { onLocaleChange } = await import('../i18n');
+      let callCount = 0;
+      const unsub = onLocaleChange(() => callCount++);
+      unsub();
+
+      setLocale('fr');
+      expect(callCount).toBe(0);
+    });
+  });
+});