fix(frontend): isolate subscription language preference (#6394)

* fix(frontend): isolate subscription language preference * fix(frontend): defer date locale resolution
2026-09-16 23:27:14 +00:00 · 2026-09-03 22:33:37 +08:00
parent 0c72dd8384
commit ded2aa150c
5 changed files with 95 additions and 23 deletions
@@ -0,0 +1,52 @@
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+describe('subscription language scope', () => {
+  afterEach(() => {
+    vi.restoreAllMocks();
+    vi.unstubAllGlobals();
+  });
+
+  it('initializes lazily and changes the subscription language without changing the panel', async () => {
+    vi.resetModules();
+    const utils = await import('@/utils');
+    const cookies = new Map<string, string>([['lang', 'en-US']]);
+    vi.spyOn(utils.CookieManager, 'getCookie').mockImplementation(
+      (name) => cookies.get(name) ?? '',
+    );
+    vi.spyOn(utils.CookieManager, 'setCookie').mockImplementation((name, value) => {
+      cookies.set(name, value);
+    });
+    const getLanguage = vi.spyOn(utils.LanguageManager, 'getLanguage');
+    const reload = vi.fn();
+    vi.stubGlobal('window', { navigator: { language: 'en-US' }, location: { reload } });
+
+    const { readyI18n } = await import('@/i18n/react');
+    expect(getLanguage).not.toHaveBeenCalled();
+
+    await readyI18n('subscription');
+    expect(cookies.get('subLang')).toBe('en-US');
+
+    utils.LanguageManager.setLanguage('fa-IR', 'subscription');
+    expect(cookies.get('lang')).toBe('en-US');
+    expect(cookies.get('subLang')).toBe('fa-IR');
+    expect(reload).toHaveBeenCalledOnce();
+
+    const dateTimeFormat = vi.spyOn(Intl, 'DateTimeFormat').mockImplementation(function (
+      locale?: Intl.LocalesArgument,
+    ) {
+      return { format: () => String(locale) } as Intl.DateTimeFormat;
+    } as typeof Intl.DateTimeFormat);
+    expect(utils.IntlUtil.formatDate(0, 'gregorian', 'fa-IR')).toBe('fa-IR');
+    expect(dateTimeFormat).toHaveBeenLastCalledWith('fa-IR', expect.any(Object));
+  });
+
+  it('does not resolve the language for empty or invalid dates', async () => {
+    const utils = await import('@/utils');
+    const getLanguage = vi.spyOn(utils.LanguageManager, 'getLanguage').mockReturnValue('en-US');
+
+    expect(utils.IntlUtil.formatDate(null)).toBe('');
+    expect(utils.IntlUtil.formatDate(undefined)).toBe('');
+    expect(utils.IntlUtil.formatDate('not-a-date')).toBe('');
+    expect(getLanguage).not.toHaveBeenCalled();
+  });
+});