未找到命令:jest [英] command not found: jest

问题描述

我有一个这样的测试文件:(我正在使用 create-react-app)

I have a test file like so: (I am using create-react-app)

import React from 'react';
import ReactDOM from 'react-dom';
import App from './components/Calculator';

import { getAction, getResult } from './actions/'

import {shallow} from 'enzyme';
import toJson from 'enzyme-to-json';

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

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

it('renders without crashing', () => {
  const wrapper = shallow(<App />)
  expect(toJson(wrapper)).toMatchSnapshot();
});

it('displays the choosen operator', () => {
  const action = {
      type: 'GET_ACTION',
      operator: '+'
    };
  expect(getAction("+")).toEqual(action)
})

it('displays the typed digit', () => {
  const action = {
    type: 'GET_RESULT',
    n: 3
  };
  expect(getResult(3)).toEqual(action);
})

it('checks that the clickevent for getNumber is called',() => {
  const clickEvent = jest.fn();
  const p = shallow(<p data-n="1" onClick={clickEvent}>1</p>)
  p.simulate('click')
  expect(clickEvent).toBeCalled();
})

和一个 packaje.json:

and a packaje.json:

{
  "name": "my-app",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "react": "^16.2.0",
    "react-dom": "^16.2.0",
    "react-scripts": "1.1.1"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    // "test": "react-scripts test --env=jsdom",
    "test": "jest",
    "eject": "react-scripts eject"
  },
  "devDependencies": {
    "enzyme": "^3.3.0",
    "enzyme-adapter-react-16": "^1.1.1",
    "enzyme-to-json": "^3.3.3",
    "jest": "^22.4.3"
  }
}

当我运行jest --updateSnapshot"时，我得到:

when I run "jest --updateSnapshot" I get:

command not found: jest

但是已经安装了 jest.

but jest is installed.

推荐答案

Jest 已安装，但可能位于您的 ./node_modules/.bin 目录中.您可以将其附加到您的命令 ./node_modules/.bin/jest --updateSnapshot.由于您已经在 package.json 中将 jest 作为 scripts 命令，您也可以使用 npm test 运行它 -- --更新快照.npm 会自动将 ./node_modules/.bin 添加到您的路径中.

Jest is installed, but is likely in your ./node_modules/.bin directory. You can append that to your command ./node_modules/.bin/jest --updateSnapshot. Since you already have jest as a scripts command in your package.json you can also run it with npm test -- --updateSnapshot. npm automatically adds ./node_modules/.bin to your path.

更新:较新版本的yarn将解析节点模块bin脚本，因此您也可以运行yarn jest {cmd}，它应该可以工作.

update: Newer versions of yarn will resolve node module bin scripts, so you can also just run yarn jest {cmd} and it should work.

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