Errors installing jest in console [duplicate] - node.js

Question

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();
})
and a package.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"
}
}
when I run jest --updateSnapshot I get:
command not found: jest
but jest is installed.

Answer 1

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.

Answer 2

I ran into similar issue. I fixed it by installing jest globally.
npm install -g jest

Answer 3

You need to run it this way :
./node_modules/.bin/jest
or run npm test

Answer 4

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.

Answer 5

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

Answer 6

A way to solve the error is to use the "npx" command.
npx jest --version
npx jest --init

Answer 7

In my case, npm didn't install the jest command for some reason.
To fix this:
I deleted the node_modules/jest directory
Re-ran npm install and got the jest command installed.

Answer 8

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

Answer 9

just use command
npm test or npm t

Answer 10

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

Answer 11

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

Answer 12

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

Answer 13

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

Answer 14

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.

Answer 15

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

Answer 16

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.

Answer 17

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

Answer 18

Had the same issue and was able to solve it by running npm install

Answer 19

Alternatively, just add jest module to package.json dependencies.
{
"dependencies": {
...
"jest": "^29.3.1",
...
}
}