用’create-react-app’创建一个React应用之后,到目前为止,一切都已经成功了.我做了一个工作中的React项目.但是现在,我希望以开玩笑的方式实施单元测试.
使用npm安装：’npm install –save-dev jest’
然后运行：npm ls jest我注意到react-script正在寻找一个明显更旧的jest版本.
package.json：
"dependencies": {
"react": "^16.8.1","react-dom": "^16.8.1","react-redux": "^6.0.0","react-scripts": "2.1.5","redux": "^4.0.1"
},"devDependencies": {
"jest": "^24.7.1"
},"scripts": {
"start": "react-scripts start","build": "react-scripts build","test": "jest","eject": "react-scripts eject"
}
npm ls开玩笑的结果：
+-- jest@24.7.1
`-- react-scripts@2.1.5
`-- jest@23.6.0
npm启动错误：
There might be a problem with the project dependency tree.
It is likely not a bug in Create React App,but something you need to fix
locally.
The react-scripts package provided by Create React App requires a
dependency:
"jest": "23.6.0"
Don't try to install it manually: your package manager does it
automatically.
However,a different version of jest was detected higher up in the tree:
C:\Users\userName\sample js codes\redux\songs\node_modules\jest (version:
24.7.1)
有解决此依赖性版本问题的解决方案吗？
最佳答案
Create-react-app内置Jest,无需额外安装.
您现在有版本冲突,因为您另外安装了它.
要解决此问题,请将您的更改还原为package.json.
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