来自节点模块的 JEST Mocking

Question

我已经尝试了一段时间，但找不到解决方案。

我尝试了很多解决方案（__ mock __ 文件夹、mockimplementation、mock 等等）但我总是遇到相同的错误client.mockImplementation is not a function

//restclient.js

module.exports = (cfg) => new Client(config);

// api.js
const client = require('restclient');
module.exports.doRequest = () => {
    const request = client();
    const config = {};
    request.get('/path/to/request', config)
    .then(result => console.log(result))
}

//api.tests.js
const client = require('restclient');
const api = require('./api');

jest.mock('restclient', () => () => ({
  get: jest.fn(),
}));
  describe('testing API', () => {
    test('test then', async () => {
      try {
        restclient.mockImplementation(() => () => ({
          get: (url, config) => 'Hi! I\'m mocked',
        }));
        const result = await api.doRequest();
        console.log('result', result);
      } catch (e) {
        console.log('eee', e);
      }
    });
  });

我找不到解决方案，我想我不能模拟const request = restclient()部分，但我不知道为什么！！

Answer 1

你错过了模拟构造函数。

这模拟了restclient的构造函数

jest.mock('restclient', ()=> jest.fn().mockImplementation(() => {

 /** here you can create and return a mock of request **/

}));