typescript - 使用 jsodom 和 jest 测试 react-mapbox-gl

Question

假设我们有以下 map 组件。这是在 TypeScript 中，但同样适用于普通的 JavaScript。

import * as React from 'react';
import ReactMapboxGl from 'react-mapbox-gl';

const MapBox = ReactMapboxGl({
  accessToken: 'pk.<redacted>'
});

export default class Map extends React.Component {
  render() {
    return (
      <MapBox
        style="mapbox://styles/mapbox/streets-v9"
        zoom={[0]}
        containerStyle={{
          height: '500px',
          width: 'inherit'
        }}
      />);
  }
}

然后它是某些 react 应用程序的一部分，这样呈现:

import * as React from 'react';

export default class App extends React.Component {
  render() {
    return (
          <Map />
    );
  }
}

为了测试这个设置，我们使用 Jest 和 JSDOM。

import * as React from 'react';
import * as ReactDOM from 'react-dom';
import App from './App';

it('renders without crashing', () => {
  const div = document.createElement('div');
  ReactDOM.render(<App />, div);
});

此测试将无法运行并产生以下输出:

    TypeError: window.URL.createObjectURL is not a function

      at Object.254.../../source/worker (node_modules/mapbox-gl/dist/mapbox-gl.js:509:100)
      at s (node_modules/mapbox-gl/dist/mapbox-gl.js:1:711)
      at node_modules/mapbox-gl/dist/mapbox-gl.js:1:762
      at Object.280.../ (node_modules/mapbox-gl/dist/mapbox-gl.js:561:28)
      at s (node_modules/mapbox-gl/dist/mapbox-gl.js:1:711)
      at node_modules/mapbox-gl/dist/mapbox-gl.js:1:762
      at Object.263../worker_pool (node_modules/mapbox-gl/dist/mapbox-gl.js:527:29)
      at s (node_modules/mapbox-gl/dist/mapbox-gl.js:1:711)
      at node_modules/mapbox-gl/dist/mapbox-gl.js:1:762
      at Object.191.../render/glyph_manager (node_modules/mapbox-gl/dist/mapbox-gl.js:383:809)
      at s (node_modules/mapbox-gl/dist/mapbox-gl.js:1:711)
      at node_modules/mapbox-gl/dist/mapbox-gl.js:1:762
      at Object.248.../geo/lng_lat (node_modules/mapbox-gl/dist/mapbox-gl.js:497:338)
      at s (node_modules/mapbox-gl/dist/mapbox-gl.js:1:711)
      at node_modules/mapbox-gl/dist/mapbox-gl.js:1:762
      at Object.72.../package.json (node_modules/mapbox-gl/dist/mapbox-gl.js:144:148)
      at s (node_modules/mapbox-gl/dist/mapbox-gl.js:1:711)
      at e (node_modules/mapbox-gl/dist/mapbox-gl.js:1:882)
      at node_modules/mapbox-gl/dist/mapbox-gl.js:1:900
      at Object.<anonymous>.i (node_modules/mapbox-gl/dist/mapbox-gl.js:1:177)
      at Object.<anonymous> (node_modules/mapbox-gl/dist/mapbox-gl.js:1:413)
      at Object.<anonymous> (node_modules/react-mapbox-gl/lib/map.js:21:16)
      at Object.<anonymous> (node_modules/react-mapbox-gl/lib/index.js:3:13)
      at Object.<anonymous> (src/Map.tsx:14:25)
      at Object.<anonymous> (src/NewOrder.tsx:21:13)
      at Object.<anonymous> (src/Routes.ts:17:18)
      at Object.<anonymous> (src/App.tsx:16:16)
      at Object.<anonymous> (src/App.test.tsx:6:169)
          at <anonymous>

亲爱的读者，您的问题很简单:是否可以解决此问题？是否存在可用于注入(inject)模拟 MapBoxGL 库的接缝？

我在 GitHub 上发现了多个与此问题相关的问题，但没有一个提供解决方案:1 , 2 .使用 mapbox-gl-js-mock 的一些要点而其他人则声称它没有用，因为它也需要真正的浏览器才能运行。

还有 related issue关于添加 URL.createObjectURL 的 JSDOM 项目，这可能会解决潜在的问题。

Answer 1

我遇到了同样的问题，当我添加下面列出的代码时 here到我的测试 block 的顶部，它起作用了。

jest.mock('mapbox-gl/dist/mapbox-gl', () => ({
   Map: () => ({})
}));