如何用jest模拟react-native-camera？

要react-native-camera在__mocks__文件夹中修复创建的react组件:

import React from 'react';

const constants = constants = {
  Aspect: {},
  BarCodeType: {},
  Type: {},
  CaptureMode: {},
  CaptureTarget: {},
  CaptureQuality: {},
  Orientation: {},
  FlashMode: {},
  TorchMode: {}
};

class Camera extends React.Component {

  static constants = constants
  render() {
    return null;
  }
}

Camera.constants = constants;

export default Camera;

并通过添加以下行修改了测试:

import mockCamera from '../__mocks__/Camera';

jest.mock('react-native-camera', () => mockCamera);