Babel 在运行 Jest 时不会编译 .test.js 文件 [英] Babel will not compile .test.js files while running Jest

问题描述

在运行 yarn run jest --no-cache 时，会抛出一个错误:

While running yarn run jest --no-cache, An error is being thrown that says:

SyntaxError: Unexpected token import

我最好的猜测是 babel 没有到达这个测试文件.我需要将它们包含在 .babelrc 中吗?

My best guess is that babel is not reaching this this test file. Is their something special I need to include in .babelrc?

路径:

/src/tests/LandingPage.test.js

测试文件:

import React from 'react';
import ReactShallowRenderer from 'react-test-renderer/shallow';
import LandingPage from '../../components/LandingPage';

test('Should render LandingPage correctly', () => {
  const renderer = new ReactShallowRenderer();
  renderer.render(<LandingPage />);
  expect(renderer.getRenderOutput()).toMatchSnapshot();
});

.babelrc :

{
  "presets": [
    "env",
    "react"
  ],
  "plugins": [
    "transform-class-properties",
    "transform-object-rest-spread"
  ]
}

推荐答案

感谢@hannad rehmann 在正确方向上的推动，这里是对我有用的解决方案.

Thanks @hannad rehmann for the nudge in the right direction here is the solution that worked for me.

yarn add babel-jest --dev

为测试环境配置 .babelrc

Jest 会自动将您的环境设置为测试，因此将您想要的任何配置复制到测试环境中.

Configure .babelrc for test env

Jest automatically sets your Env to test, so duplicate whatever config you want to the test env.

{
  "presets": [
    "env",
    "react"
  ],
  "plugins": [
    "transform-class-properties",
    "transform-object-rest-spread"
  ],
  "env": {
    "test": {
      "presets": [
        "env",
        "react"
        ],
      "plugins": [
        "transform-class-properties",
        "transform-object-rest-spread"
      ]
    }
  }
}

将 jest.config.json 添加到项目根目录

Add jest.config.json to project root

{
  "transform": {
    "^.+\.jsx?$": "babel-jest"
  }
}

最后，让你的测试脚本知道在哪里可以找到配置文件

我刚刚将它添加到 package.json 中的测试脚本中，但您也可以在命令行中运行它.

Finally, let your test script know where to find config file

I just added it to my test script in package.json, but you can also just run this in the command line.

"scripts": {
    "test": "jest --config=jest.config.json --watch"
},

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