在创建 package.json 时，test 命令是什么？

在使用 npm init从命令行创建 package.json以便在 Node.js 中创建模块时，有一个我不知道的 测试命令字段。在执行 npm help json的文档中也没有提到它，在 CLI 中也没有。

请解释一下是关于什么的。

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Assuming you mean scripts.test:

"scripts" : {
"test" : "echo \"Error: no test specified\" && exit 1"
}

This field contains the program(/command line) that should run when you call npm test. Typically, that program is a test-runner like mocha, ava, jest, ...

The default value is a placeholder that prints an error message (try running npm test in the same directory as your package.json).

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最佳答案

The test command is the command that is run whenever you call npm test.

This is important when integrating with continuous integration/continuous deployment tools (such as jenkins, codeship, teamcity).

Example:
- say you deploy a project to AWS or some other cloud hosting provider,
- you can set up your infrastructure to automatically run npm test.
- If there are problems within those tests, your ci/cd will automatically rollback before deploying.

To execute tests
You can use karma, jest, or selenium/nightmare/phantomjs or about any other test scripting library/framework that allows you to write and execute tests and then set the required command in scripts.test and finally run it from npm test.


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