如何在jest中更改body属性？

// __mocks__/node-fetch.js

const mockFetch = jest.fn();

mockFetch.mockImplementation(() =>
  Promise.resolve({
    json: () => Promise.resolve({}),
  })
);

module.exports = mockFetch;

// my-test-file.test.js

jest.mock('node-fetch');

const fetch = require('node-fetch');

// ...

test('should modify body property', async () => {
  const mockResponse = {
    json: jest.fn().mockResolvedValue({}),
  };

  fetch.mockResolvedValue(mockResponse);

  const response = await fetch('https://example.com/api/data');

  response.json.mockImplementation(() =>
    Promise.resolve({
      body: 'new value',
    })
  );

  // 断言或其他操作
});