Javascript 检索用于酶单元测试的组件的材料UI CreateShalf失败

我正在尝试用MaterialUI上的酵素实现一个简单的单元测试，在MuiThemeProvider中有一个组件。为了测试基本版本，我从中选取了示例，但是每当我运行

npm测试时，我都会得到下面的错误

关于如何从MuiThemeProvider中检索组件，以便稍后在潜水和单元测试中使用，有什么建议吗

  Cannot find module 'react' from 'MuiThemeProvider.js'

    However, Jest was able to find:
        './MuiThemeProvider.d.ts'
        './MuiThemeProvider.js'

    You might want to include a file extension in your import, or update your 'moduleFileExtensions', which is currently ['js', 'json', 'jsx', 'ts', 'tsx', 'node'].

    See https://jestjs.io/docs/en/configuration#modulefileextensions-array-string

      at Resolver.resolveModule (node_modules/jest-runtime/node_modules/jest-resolve/build/index.js:259:17)
      at Object.<anonymous> (../../../node_modules/@material-ui/core/styles/MuiThemeProvider.js:26:37)

我的设置在
test/setupTests.js
中定义如下：

import React from 'react'
import Enzyme, { shallow, render, mount } from 'enzyme'
import Adapter from 'enzyme-adapter-react-16'

// React 16 Enzyme adapter
Enzyme.configure({ adapter: new Adapter() })

// Make Enzyme functions available in all test files without importing
global.React = React
global.shallow = shallow
global.render = render
global.mount = mount

我发现问题可能与babel有关，因此在项目中配置了
.babelrc
，如下所示：

{
  "env": {
    "test": {
      "presets": ["@babel/preset-env", "@babel/preset-react"],
      "plugins": ["transform-export-extensions"],
      "only": [
        "./**/*.js",
        "node_modules/jest-runtime"
      ]
    }
  },
  "presets": ["@babel/preset-react"]
}

mypackage.json中的关键部分是

"dependencies": {
    "enzyme": "~3.10.0",
    "enzyme-adapter-react-16": "~1.14.0",
    "material-ui": "~0.20.2",
    "react": "~16.9.0",
    "react-dom": "~16.9.0",
    "react-icons": "~3.7.0",
    "react-scripts": "~3.1.1",
    "react-test-renderer": "~16.9.0",
    "react-validation-framework": "^5.1.0"
  },
  "devDependencies": {
    "@babel/preset-react": "^7.0.0",
    "babel-plugin-transform-export-extensions": "^6.22.0",
    "babel-preset-env": "~1.7.0",
    "enzyme-to-json": "^3.4.0"
  }

"dependencies": {
    "enzyme": "~3.10.0",
    "enzyme-adapter-react-16": "~1.14.0",
    "material-ui": "~0.20.2",
    "react": "~16.9.0",
    "react-dom": "~16.9.0",
    "react-icons": "~3.7.0",
    "react-scripts": "~3.1.1",
    "react-test-renderer": "~16.9.0",
    "react-validation-framework": "^5.1.0"
  },
  "devDependencies": {
    "@babel/preset-react": "^7.0.0",
    "babel-plugin-transform-export-extensions": "^6.22.0",
    "babel-preset-env": "~1.7.0",
    "enzyme-to-json": "^3.4.0"
  }