如何从CDN导入的包测试构造函数调用

Question

我正在为tesseract ocr软件包编写测试。问题是使用cdn（<script src='https://unpkg.com/tesseract.js@v2.0.0-alpha.10/dist/tesseract.min.js'></script>）将数据包导入了react index.html。必须进行测试，我无法在global（global.tesseract）或窗口（window.tesseract）中找到它。当我不断收到此错误时，如何将这个软件包放入测试文件中

  

TypeError：无法读取未定义的属性'TesseractWorker'。

我需要能够找到该软件包并测试该文件

import getDetails from '../getDetails';

describe('getDetails() function', () => {
  const file = {
    name: 'image.png',
  };
  const response = { data: {} };

   const { TesseractWorker } = window.Tesseract;
  const worker = new TesseractWorker();

  it('should return ticket details', async () => {
    worker ({
      recognize: jest.fn(() => ({
        progress: jest.fn().mockImplementation(() => Promise.resolve({
          text:: `An updated look at all the ways that autonomous vehicles will change our lives in profound ways.`
 }))
      }))
    });