Question

考虑我们有以下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'
        }}
      />);
  }
}

然后它是一些反应应用程序的一部分，如下所示：

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：是否有可能解决这个问题？我们可以使用接缝来注入模拟的MapBoxGL库吗？

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

JSDOM项目中还有related issue关于添加URL.createObjectURL的问题，这可能会解决根本问题。

Answer 1

您可以将其添加到setupTest.ts的测试条目文件中

jest.mock('mapbox-gl/dist/mapbox-gl', () => ({
  GeolocateControl: jest.fn(),
  Map: jest.fn(() => ({
    addControl: jest.fn(),
    on: jest.fn(),
    remove: jest.fn(),
  })),
  NavigationControl: jest.fn(),
}));

Answer 2

我遇到了同样的问题，当我在测试块的顶部添加下面列出的here代码时，它起作用了。

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

Answer 3

如果您使用导入和打字稿：

jest.mock('mapbox-gl/dist/mapbox-gl', () => {
  return {
    'default': {
      accessToken: '',
      GeolocateControl: jest.fn(),
      Map: jest.fn(() => ({
        addControl: jest.fn(),
        on: jest.fn(),
        remove: jest.fn(),
        fitBounds: jest.fn(),
      })),
      NavigationControl: jest.fn(),
    }
  }
});

使用jsodom和jest测试react-mapbox-gl

3 个答案: