frontend/__tests__/utils/i18n-test-utils.tsx

import { ReactNode } from "react";
import { I18nextProvider } from "react-i18next";

const mockI18n = {
  language: "ja",
  t: (key: string) => {
    const translations: Record<string, string> = {
      "SUGGESTIONS$TODO_APP": "ToDoリストアプリを開発する",
      "LANDING$BUILD_APP_BUTTON": "プルリクエストを表示するアプリを開発する",
      "SUGGESTIONS$HACKER_NEWS": "Hacker Newsのトップ記事を表示するbashスクリプトを作成する",
      "LANDING$TITLE": "一緒に開発を始めましょう！",
      "OPEN_IN_VSCODE": "VS Codeで開く",
      "INCREASE_TEST_COVERAGE": "テストカバレッジを向上",
      "AUTO_MERGE_PRS": "PRを自動マージ",
      "FIX_README": "READMEを修正",
      "CLEAN_DEPENDENCIES": "依存関係を整理"
    };
    return translations[key] || key;
  },
  exists: () => true,
  changeLanguage: () => new Promise(() => {}),
  use: () => mockI18n,
};

export function I18nTestProvider({ children }: { children: ReactNode }) {
  return (
    <I18nextProvider i18n={mockI18n as any}>{children}</I18nextProvider>
  );
}