开玩笑：测试套件无法运行，SyntaxError：意外的令牌导入

Question

这是我来自package.json文件的笑话配置：

"jest": {
    "automock": false,
    "browser": true,
    "moduleNameMapper": {
      "\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$": "./app/tests/mocks/FileMock.js",
      "\\.(css|less)$": "identity-obj-proxy"
    },
    "moduleFileExtensions": [
      "js",
      "jsx"
    ],
    "moduleDirectories": [
      "node_modules"
    ],
    "transform": {
      "^.+\\.jsx?$": "./node_modules/babel-jest",
      "\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$": "./app/tests/mocks/FileTransformer.js"
    },
    "testEnvironment": "jsdom",
    "testPathDirs": [
      "./app/tests"
    ],
    "testRegex": ".*.test.js",
    "verbose": true
  }

.babelrc文件位于我的根文件夹中：

{
  "plugins": ["syntax-dynamic-import", "transform-runtime"],
  "presets": [
    [
      "es2015",
      {
        "modules": false
      }
    ],
    "react",
    "stage-0"
  ],
  "env": {
    "start": {
      "presets": [
        "react-hmre"
      ]
    }
  }
}

根据在开玩笑的入门页面上找到的文档，这是babel运作所需的一切，这很神奇。

无论如何，此测试：

import React from 'react';
import {shallow} from 'enzyme';
import Landing from '../components/Landing.component';

describe('<Landing/>', () => {
  it('should render a header to the page', () => {
    const landing = shallow(<Landing/>);
    expect(landing.find('h1').text()).toBe('This is the Landing component');
  });
});

返回：

FAIL  app/tests/Landing.component.test.js   
 ● Test suite failed to run

   /Users/shooshte/PersonalProjects/surviveJS/app/tests/Landing.component.test.js:1
   ({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,global,jest){import React from 'react';
                                                                                            ^^^^^^
   SyntaxError: Unexpected token import

     at transformAndBuildScript (node_modules/jest-runtime/build/transform.js:320:12)

我究竟做错了什么？

Answer 1

Jest设置了env变量进行测试，因此我不得不将预设添加到.babelrc中的env设置中：

{
  "plugins": ["syntax-dynamic-import", "transform-runtime"],
  "presets": [
    [
      "es2015",
      {
        "modules": false
      }
    ],
    "react",
    "stage-0"
  ],
  "env": {
    "start": {
      "presets": [
        "react-hmre"
      ]
    },
    "test": {
      "presets": ["es2015", "react", "stage-0"]
    }
  }
}