It does call the command specified in the scripts. test property of package. json, but it also sets up certain environment variables, such as PATH so you can refer to commands that only exist within your node_modules directory, but not installed globally.

Is it npm test or npm run test?

2 Answers. TL;DR there is no difference. It’s just a shortcut for npm tests which run the test command in the package.

How do I run one npm test?

In order to run a specific test, you’ll need to use the jest command. npm test will not work. To access jest directly on the command line, install it via npm i -g jest-cli or yarn global add jest-cli . Then simply run your specific test with jest bar.