diff --git a/tests/unit/i18n.locale-alias.spec.js b/tests/unit/i18n.locale-alias.spec.js
new file mode 100644
index 0000000..bfcacbf
--- /dev/null
+++ b/tests/unit/i18n.locale-alias.spec.js
@@ -0,0 +1,36 @@
+// How to run this test in isolation:
+//   npm run test:unit -- i18n.locale-alias.spec.js
+
+describe('i18n locale aliases', () => {
+  test('resolves pageLogin.language for en (alias to en-US)', async () => {
+    const { createI18nInstance } = await import('@/i18n');
+    const base = require('@/locales/en-US.json');
+    const loadBase = () => ({ 'en-US': base.default || base });
+    const i18n = createI18nInstance(undefined, 'en', undefined, loadBase);
+    expect(i18n.global.t('pageLogin.language')).toBe('Language');
+  });
+
+  test('resolves pageLogin.language for en-US', async () => {
+    const { createI18nInstance } = await import('@/i18n');
+    const base = require('@/locales/en-US.json');
+    const loadBase = () => ({ 'en-US': base.default || base });
+    const i18n = createI18nInstance(undefined, 'en-US', undefined, loadBase);
+    expect(i18n.global.t('pageLogin.language')).toBe('Language');
+  });
+
+  test('resolves pageLogin.language for ka (alias to ka-GE)', async () => {
+    const { createI18nInstance } = await import('@/i18n');
+    const base = require('@/locales/ka-GE.json');
+    const loadBase = () => ({ 'ka-GE': base.default || base });
+    const i18n = createI18nInstance(undefined, 'ka', undefined, loadBase);
+    expect(i18n.global.t('pageLogin.language')).toBe('ენა');
+  });
+
+  test('resolves pageLogin.language for ka-GE', async () => {
+    const { createI18nInstance } = await import('@/i18n');
+    const base = require('@/locales/ka-GE.json');
+    const loadBase = () => ({ 'ka-GE': base.default || base });
+    const i18n = createI18nInstance(undefined, 'ka-GE', undefined, loadBase);
+    expect(i18n.global.t('pageLogin.language')).toBe('ენა');
+  });
+});