export function mockFetch(responseText: string) {
  return jest.fn().mockImplementation((url: string) => {
    // Check if the URL being requested is our sitemap endpoint.
    if (url.includes('/api/sitemap')) {
      return Promise.resolve({
        ok: true,
        text: () => Promise.resolve(responseText),
      });
    }
    return Promise.reject(new Error(`Unknown URL: ${url}`));
  });
}