如何为 React 和 Jest 测试框架配置 .babelrc？

Question

我从头开始创建了一个 React 应用程序(createapp.dev)，并且正在使用 parcel bundler 来打包它。

我尝试使用 https://testing-library.com/ 和开玩笑对其进行单元测试，但我一直收到此错误。

src/components/App.test.js
  ● Test suite failed to run

    Jest encountered an unexpected token

    This usually means that you are trying to import a file which Jest cannot parse, e.g. it's not plain JavaScript.

    By default, if Jest sees a Babel config, it will use that
to transform your files, ignoring "node_modules".

    Here's what you can do:
     • To have some of your "node_modules" files transformed,
you can specify a custom "transformIgnorePatterns" in your config.
     • If you need a custom transformation specify a "transform" option in your config.
     • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.

    You'll find more details and examples of these config options in the docs:
    https://jestjs.io/docs/en/configuration.html

我该如何解决？这些是我的文件 .babelrc

{
    "presets": [
      [
        "@babel/preset-env",
        {
          "modules": false
        }
      ],
      ["@babel/preset-react"]
    ],
    "plugins": ["@babel/plugin-proposal-class-properties" ]
  }

package.json

{

  "main": "src/index.js",

  "scripts": {
    "test": "jest",
    "start": "parcel public/index.html --host 127.0.0.1 --port 8080",
  },
  "dependencies": {
    "react": "^16.12.0",
    "react-dom": "^16.12.0"
  },
  "devDependencies": {
    "@babel/core": "^7.8.7",
    "@babel/plugin-proposal-class-properties": "^7.8.3",
    "@babel/preset-env": "^7.8.7",
    "@babel/preset-react": "^7.8.3",
    "@testing-library/react": "^10.0.1",
    "babel-jest": "^25.1.0",
    "jest": "^25.1.0",
    "parcel": "^1.12.4",
    "parcel-bundler": "^1.12.4",
    "prettier": "^1.19.1"
  }
}

Answer 1

我意识到安装 @testing-library/react 和 jest 是不够的我添加了以下内容

@testing-library/dom
@testing-library/jest-dom
@testing-library/user-event
babel-jest

我也把我的 .babelrc 改成这样

{
    "presets": [
      [
        "@babel/preset-env",
        {
          "targets": {
            "node": "current"
          }
        }
      ],
      ["@babel/preset-react"]
    ],
    "plugins": ["@babel/plugin-proposal-class-properties" ]
  }

如何为 React 和 Jest 测试框架配置 .babelrc？

How do I configure .babelrc for react and jest testing framework?

unit-testing

reactjs

jestjs

parceljs

react-testing-library