我有一个API调用函数，从我的后端检索数据显示。我的API调用作为检索数据时授权所需的标头。会话存储在应用程序运行时在登录时设置。
我的主要代码是这样的：

AdminTable.js
export const ADMIN_URL = '/admin_management/list/';

export const fetchAdmin = async () => {
  try {
    const response = await axios.post(
      ADMIN_URL,
      {},
      {
        headers: { Authorization: `Bearer ${sessionStorage.getItem('access_token')}` },
      }
    );
    return response.data.results;
  } catch (err) {
    console.log(`Error: ${err.message}`);
  }
};

我的测试代码是：

AdminTable.test.js
import { fetchAdmin } from '../pages/AdminTable';
import axios from '../api/axios';

jest.mock('../api/axios', () => ({
  post: jest.fn(),
}));
axios.post.mockResolvedValue({ data: { results: 'Mock Jedi' } });

describe('fetchAdmin', () => {
  afterEach(jest.clearAllMocks);
  it('return correct data', async () => {
    const result = await fetchAdmin();
    expect(result).toMatch('Mock Jedi');
    expect(axios.post).toHaveBeenCalledTimes(1);
  });
});

当我运行测试时，我得到这个错误：

Expected substring: "Mock Jedi"
    Received string:    "sessionStorage is not defined"

    > 19 |     expect(result).toMatch('Mock Jedi');
         |                    ^
      20 |     expect(axios.post).toHaveBeenCalledTimes(1);
      21 |   });
      22 | });

我如何模拟jest来插入sessionStorage的令牌？
如果我删除头文件或在AdminTable.js文件中设置Bearer ${'123123'}，则测试没有问题。