From 8efbee1ba9b4fc564f5a32fcbc101ff256c5555b Mon Sep 17 00:00:00 2001
From: "Max P." <mail@0xMax42.io>
Date: Wed, 28 May 2025 18:09:24 +0200
Subject: [PATCH] test(i18n): add unit tests for localization functions

- Add tests for `loadLocale` to verify translations load correctly
- Add tests for `t` to ensure fallback behavior for missing keys
- Add tests for `getCurrentLanguage` to validate language detection logic
---
 src/i18n/__tests__/i18n.test.ts | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 src/i18n/__tests__/i18n.test.ts

diff --git a/src/i18n/__tests__/i18n.test.ts b/src/i18n/__tests__/i18n.test.ts
new file mode 100644
index 0000000..f0a93bf
--- /dev/null
+++ b/src/i18n/__tests__/i18n.test.ts
@@ -0,0 +1,32 @@
+import { assertEquals } from 'https://deno.land/std@0.224.0/assert/mod.ts';
+import { getCurrentLanguage, loadLocale, t } from '../mod.ts';
+
+Deno.test('loadLocale lade Deutsche Übersetzung', async () => {
+    await loadLocale('de');
+    assertEquals(
+        t('error_write_units'),
+        'Fehler beim Schreiben der Units:',
+    );
+    assertEquals(
+        t('unit_written_service', { path: '/tmp/service' }),
+        'Service Unit geschrieben in: /tmp/service',
+    );
+});
+
+Deno.test('t gibt den Schlüssel zurück, wenn dieser nicht gefunden wird', () => {
+    const result = t('non_existent_key');
+    assertEquals(result, 'non_existent_key');
+});
+
+Deno.test('getCurrentLanguage gibt die Fallback Sprache zurück', () => {
+    Deno.env.delete('SYSTEMD_TIMER_LANG');
+    Deno.env.delete('LC_ALL');
+    Deno.env.delete('LC_MESSAGES');
+    Deno.env.delete('LANG');
+    assertEquals(getCurrentLanguage(), 'en');
+});
+
+Deno.test('getCurrentLanguage nutz die `SYSTEMD_TIMER_LANG`, wenn gesetzt', () => {
+    Deno.env.set('SYSTEMD_TIMER_LANG', 'de_DE.UTF-8');
+    assertEquals(getCurrentLanguage(), 'de');
+});