开玩笑:为什么它会因TypeError失败:路径必须是字符串.收到未定义

问题描述

我编写了一个React应用程序，并开玩笑地编写了单元测试.

I wrote a React application and used jest to write unit tests.

当我通过"jest --config = jest.config.json --watch"运行它时，出现以下错误:

when I run it by "jest --config=jest.config.json --watch" I get the following error:

TypeError: Path must be a string. Received undefined

  at assertPath (path.js:7:11)
  at Object.relative (path.js:1226:5)

我的jest.config.json是:

My jest.config.json is:

{
    "snapshotSerializers": [
        "enzyme-to-json/serializer"
    ],
    "transformIgnorePatterns": [
        "node_modules/(?!(react-native|my-project|redux-persist)/)"
    ]
}

推荐答案

由于我使用create-react-app构建了我的应用程序，因此我只运行了"npm test"，并且测试成功运行.

Since I built my app using create-react-app, I just ran "npm test" and the tests ran successfully.

我了解到Jest已自动包含在项目中，并且可能在package.json中手动添加笑话是无效的.

I understood that Jest is automatically included in the project, andprobably adding manually jest to package.json is not effective.

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