Javascript 未找到命令：jest
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command not found: jest
提问by Alessandro
I have a test file like so: (I am using create-react-app)
我有一个像这样的测试文件：（我正在使用 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 packaje.json:
和一个 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"
}
}
when I run "jest --updateSnapshot" I get:
当我运行“jest --updateSnapshot”时，我得到：
command not found: jest
but jest is installed.
但是安装了 jest。
回答by CaptEmulation
Jestis installed, but is likely in your ./node_modules/.bindirectory. You can append that to your command ./node_modules/.bin/jest --updateSnapshot. Since you already have jestas a scriptscommand in your package.jsonyou can also run it with npm test -- --updateSnapshot. npm automatically adds ./node_modules/.binto your path.
Jest已安装，但可能在您的./node_modules/.bin目录中。您可以将其附加到您的命令中./node_modules/.bin/jest --updateSnapshot。由于您已经有了jest一个scripts命令，您package.json也可以使用npm test -- --updateSnapshot. npm 会自动添加./node_modules/.bin到您的路径中。
回答by El Aoutar Hamza
You need to run it this way :
你需要这样运行它：
./node_modules/.bin/jest
or run npm test
或运行 npm test
回答by Siddhartha Thota
I ran into similar issue. I fixed it by installing jest globally.
我遇到了类似的问题。我通过在全球安装 jest 来修复它。
npm install -g jest
回答by sybozz
Install the Jest command-line interface (Jest CLI):
安装 Jest 命令行界面 (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.
然后运行 jest 命令。在 Windows 10 上的 docker 的 linux 实例中为我工作。
回答by tywhang
In my case, npm didn't install the jestcommand for some reason.
就我而言，npmjest由于某种原因没有安装该命令。
To fix this:
要解决此问题：
- I deleted the
node_modules/jestdirectory - Re-ran
npm installand got thejestcommand installed.
- 我删除了
node_modules/jest目录 - 重新运行
npm install并jest安装了命令。
回答by аlex dyky?
just use command
只需使用命令
npm testor npm t
npm test或者 npm t
回答by kidroca
Removing node_modules and running npm installagain fixed this for me
Also the "new" npm cicommand 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_modulesand re-installing
删除 node_modules 并npm install再次运行为我npm ci解决了这个问题此外，“新”命令可以解决这个问题，因为它删除（或清除）节点模块并每次执行全新安装，而且与手动删除node_modules和重新安装相比，它更快
回答by Diego Ulloa
Just reload your bash config file after install jest:
安装 jest 后只需重新加载 bash 配置文件：
source ~/.bashrc # on linux ?
source ~/.bash_profile # on macOs
Jest will be not recognized but executed with npx jest automatically
Jest 不会被识别，但会自动使用 npx jest 执行
