diff --git a/src/utils/__tests__/currentLanguage.test.js b/src/utils/__tests__/currentLanguage.test.js
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+/*
+Copyright 2026 Seekra
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { expect, test } from 'vitest';
+import getCurrentLanguage from '../currentLanguage';
+
+const locales = [
+    { navigatorLanguage: 'en',                      localStorageLanguage: null, expected: 'en'},
+    { navigatorLanguage: 'de',                      localStorageLanguage: null, expected: 'de'},
+    { navigatorLanguage: 'fr',                      localStorageLanguage: null, expected: 'fr'},
+
+    { navigatorLanguage: 'en-US',                   localStorageLanguage: null, expected: 'en'},
+    { navigatorLanguage: 'en-AU',                   localStorageLanguage: null, expected: 'en'},
+    { navigatorLanguage: 'de-DE',                   localStorageLanguage: null, expected: 'de'},
+    { navigatorLanguage: 'fr-FR',                   localStorageLanguage: null, expected: 'fr'},
+
+    { navigatorLanguage: 'en-us',                   localStorageLanguage: null, expected: 'en'},
+    { navigatorLanguage: 'en-au',                   localStorageLanguage: null, expected: 'en'},
+    { navigatorLanguage: 'de-de',                   localStorageLanguage: null, expected: 'de'},
+    { navigatorLanguage: 'fr-fr',                   localStorageLanguage: null, expected: 'fr'},
+
+    { navigatorLanguage: 'zh-Hans-CN',              localStorageLanguage: null, expected: 'zh'},
+    { navigatorLanguage: 'zh-Hant-TW',              localStorageLanguage: null, expected: 'zh'},
+    { navigatorLanguage: 'uz-Latn-UZ',              localStorageLanguage: null, expected: 'uz'},
+
+    { navigatorLanguage: 'en-US-u-ca-gregory',      localStorageLanguage: null, expected: 'en'},
+    { navigatorLanguage: 'de-DE-u-co-phonebk',      localStorageLanguage: null, expected: 'de'},
+    { navigatorLanguage: 'zh-Hant-TW-u-co-phonebk', localStorageLanguage: null, expected: 'zh'},
+
+    { navigatorLanguage: 'en',                      localStorageLanguage: 'de', expected: 'de'},
+    { navigatorLanguage: 'de-DE',                   localStorageLanguage: 'en', expected: 'en'},
+    { navigatorLanguage: 'de-de',                   localStorageLanguage: 'en', expected: 'en'},
+    { navigatorLanguage: 'zh-Hans-CN',              localStorageLanguage: 'fr', expected: 'fr'},
+    { navigatorLanguage: 'en-US-u-ca-gregory',      localStorageLanguage: 'zh', expected: 'zh'}
+];
+
+test.for(locales)('returns the language $expected (navigator: $navigatorLanguage; local storage: $localStorageLanguage)', ({ navigatorLanguage, localStorageLanguage, expected }) => {
+    Object.defineProperty(navigator, 'language', {
+        value: navigatorLanguage,
+        configurable: true
+    });
+
+    if (localStorageLanguage) {
+        localStorage.setItem('locale', localStorageLanguage);
+    };
+
+    expect(getCurrentLanguage()).toBe(expected);
+});
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