“命令未找到: jest”

我有一个这样的测试文件: (我使用 create-response-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();
})

还有一个包裹:

{
"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:

command not found: jest

enter image description here

但是我已经开了玩笑。

147704 次浏览
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just use command

npm test or npm t

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最佳答案

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.

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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You need to run it this way : 

./node_modules/.bin/jest

or run npm test

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Install the Jest command-line interface (Jest CLI):

npm install --save-dev jest-cli

Then run the jest command. Working for me in a linux instance by docker on Windows 10.

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In my case, npm didn't install the jest command for some reason.

To fix this:

  1. I deleted the node_modules/jest directory
  2. Re-ran npm install and got the jest command installed.
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I ran into similar issue. I fixed it by installing jest globally.

npm install -g jest
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Removing node_modules and running npm install again fixed this for me Also the "new" npm ci command can fix this as it deletes (or clears) node modules and performs a clean install each time, plus it's faster compared to manually deleting node_modules and re-installing

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Just reload your bash config file after install jest:

source ~/.bashrc # on linux ?
source ~/.bash_profile # on macOs

Jest will be not recognized but executed with npx jest automatically

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My situation was caused by my git pipeline. I wasn't caching node_modules nor was I caching untracked files.

Ultimately I added

cache:
# untracked: true
key:
files:
- package-lock.json
paths:
- node_modules

to my pipeline .yml and violá

Note

you can either use path OR untracked, find out more about each to see what works best for you

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I was getting zsh: command not found: jest after installing jest and trying to use the command jest. The solution that worked for me was running npx jest

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You can run the test using npx jest [parameters]. npx is the package runner. It will help you execute a locally installed package.

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I use yarn. Adding jest and jest-cli to node_modules did not make any difference with my attempts to run tests like jest mytest.test.js. In addition to mentioned steps, the following helped to get it running:

yarn jest mytest.test.js
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you can run ln -s ./node_modules/.bin/jest jest and then run jest --init it will work. Or you can install jest cli with npm install --save-dev jest-cli and then run jest --init it will also work.

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try using the command

npx jest <folder>

I ran into the same problem. I tried multiple solutions and this worked.

I also have jest CLI installed

you can install it by using this command in your shell

npm install --save-dev jest-cli
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In my case, I was trying to install jest with yarn on a pipeline to run tests and since I had jest installed as a devDependency it wasn't installing on yarn install.

I found this bug on GitHub https://github.com/yarnpkg/yarn/issues/2739 that it seems that Yarn will not install devDependencies when NODE_ENV=production.

I just needed to change the NODE_ENV and after that, it was working, otherwise, run it like this:

yarn install --production=false
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Had the same issue and was able to solve it by running npm install

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A way to solve the error is to use the "npx" command.

npx jest --version




npx jest --init
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Faced the same issue. But it was due to the wrong node version. If you use the latest jest v29, you need Node version 14 or higher.


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