#424

frontend/src/pages/help/HelpChangesPage.test.tsx

@@ -41,6 +41,8 @@ describe ('Help global edition history', () => {
     expect (screen.getAllByRole ('columnheader').map (cell => cell.textContent))
 	.toEqual (['差分', 'タイトル', '有効開始年月日'])
     expect (container).not.toHaveTextContent ('未公開ホーム')
+    expect (container).not.toHaveTextContent ('Invalid Date')
+    expect (container.textContent).not.toMatch (/\d{1,2}:\d{2}/)
     expect (screen.getAllByRole ('link', { name: '差分' }).map (link =>
 	link.getAttribute ('href'))).toEqual ([
 	'/help/guide/diff?from=2026-10-02.3&to=2026-10-02.10',