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frontend/tests/timezoneLabel.test.ts

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+/**
+ * Timezone labelling, and the guard against the Asia/Shanghai hardcode
+ * returning.
+ *
+ * Codex reset-credit expiry was rendered in a fixed GMT+8 while every other
+ * timestamp on the same page used the browser's timezone — so one credit
+ * appeared twice, in two timezones, on one screen.
+ */
+
+import { describe, expect, test } from 'vitest';
+import i18n from '@/i18n';
+import * as resetCredits from '@/utils/quota/resetCredits';
+import { formatUtcOffsetLabel, resolveTimeZoneLabel } from '@/utils/time/timezone';
+
+describe('formatUtcOffsetLabel', () => {
+  test('renders whole-hour offsets east and west of UTC', () => {
+    expect(formatUtcOffsetLabel(480)).toBe('GMT+8');
+    expect(formatUtcOffsetLabel(-300)).toBe('GMT-5');
+    expect(formatUtcOffsetLabel(720)).toBe('GMT+12');
+    expect(formatUtcOffsetLabel(-720)).toBe('GMT-12');
+  });
+
+  test('renders half- and quarter-hour offsets', () => {
+    expect(formatUtcOffsetLabel(330)).toBe('GMT+5:30');
+    expect(formatUtcOffsetLabel(-570)).toBe('GMT-9:30');
+    expect(formatUtcOffsetLabel(345)).toBe('GMT+5:45');
+  });
+
+  test('UTC itself carries no sign', () => {
+    expect(formatUtcOffsetLabel(0)).toBe('GMT');
+    expect(formatUtcOffsetLabel(-0)).toBe('GMT');
+  });
+
+  test('a non-finite offset degrades to a bare GMT rather than "GMT+NaN"', () => {
+    expect(formatUtcOffsetLabel(Number.NaN)).toBe('GMT');
+  });
+});
+
+describe('resolveTimeZoneLabel', () => {
+  test('produces a well-formed label whatever timezone the runner is in', () => {
+    expect(resolveTimeZoneLabel()).toMatch(/^GMT([+-]\d{1,2}(:\d{2})?)?$/);
+  });
+
+  test('reflects the offset of the instant it is given, not of "now"', () => {
+    // A DST-observing zone answers differently in January than in July, so the
+    // label has to follow the date the timestamps are being rendered for.
+    const january = new Date(2026, 0, 15, 12);
+    const july = new Date(2026, 6, 15, 12);
+    expect(resolveTimeZoneLabel(january)).toBe(
+      formatUtcOffsetLabel(-january.getTimezoneOffset())
+    );
+    expect(resolveTimeZoneLabel(july)).toBe(formatUtcOffsetLabel(-july.getTimezoneOffset()));
+  });
+});
+
+describe('Asia/Shanghai hardcode', () => {
+  test('is gone from the reset-credit module', () => {
+    expect('formatShanghaiDateTime' in resetCredits).toBe(false);
+    expect(resetCredits.normalizeCodexResetCreditsPayload).toBeDefined();
+  });
+
+  test('the expiry heading interpolates a timezone in all four locales', async () => {
+    for (const locale of ['en', 'zh-CN', 'zh-TW', 'ru']) {
+      await i18n.changeLanguage(locale);
+      const label = i18n.t('codex_quota.reset_credits_expiry_label', { timezone: 'GMT+8' });
+      expect(label).toContain('GMT+8');
+      expect(label).not.toContain('{{');
+    }
+    await i18n.changeLanguage('en');
+  });
+});