当节点模块具有 es6 语法（create-react-app）时，Jest 无法运行

Question

我有一个create-react-app 项目并尝试使用Jest 和Enzyme 对office-ui-fabric-react 组件进行单元测试。

最新版本的office-ui-fabric-react 使用es6 语法和jest 无法运行测试。

import { mount } from "enzyme";
import React from "react";
import { MessageBar, MessageBarType } from "office-ui-fabric-react/lib/MessageBar";

describe("<MessageBar />", () => {
    it("renders message bar correctly", () => {
        const wrapper = mount(<MessageBar messageBarType={MessageBarType.success} />);
        expect(wrapper.find('.ms-MessageBar--success').length).toEqual(1);
    });
});

这是来自 create-react-app 的 package.json 文件，添加了一些内容

{
  "name": "test",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "dependencies": {
    "office-ui-fabric-react": "^6.110.1",
    "react": "^16.6.3",
    "react-dom": "^16.6.3",
    "react-scripts": "2.1.1"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "devDependencies": {
    "@types/enzyme": "3.1.5",
    "@types/enzyme-adapter-react-16": "1.0.1",
    "@types/jest": "23.0.0",
    "@types/react": "16.3.16",
    "@types/react-dom": "16.0.5",
    "@types/react-test-renderer": "^16.0.0",
    "enzyme": "^3.7.0",
    "enzyme-adapter-react-16": "^1.7.0",
    "jest": "^23.6.0"
  }
}

错误

create-react-app 不允许我在不弹出的情况下在package.json 中为jest 指定ani 选项。

Answer 1

在查看了上面 cmets 中的建议后，以下设置对我有用：

{
  "name": "test",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "dependencies": {
    "office-ui-fabric-react": "^6.110.1",
    "react": "^16.6.3",
    "react-dom": "^16.6.3",
    "react-scripts": "2.1.1"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "devDependencies": {
    "babel-core": "^7.0.0-bridge.0",
    "babel-jest": "^23.6.0",
    "enzyme": "^3.7.0",
    "enzyme-adapter-react-16": "^1.7.0",
    "jest": "^23.6.0"
  }
}

在我的测试文件sample-tests.jsx

import Enzyme from "enzyme";
import { mount } from "enzyme";
import React from "react";
import { MessageBar, MessageBarType } from "office-ui-fabric-react/lib-commonjs/MessageBar";

import Adapter from 'enzyme-adapter-react-16';

Enzyme.configure({ adapter: new Adapter() });

describe("<MessageBar />", () => {
    it("renders message bar correctly", () => {
        const wrapper = mount(<MessageBar messageBarType={MessageBarType.success} />);
        expect(wrapper.find('.ms-MessageBar--success').length).toEqual(1);
    });
});