yarn test

Runs the test script defined by the package.

yarn test

If you have defined a scripts object in your package, this command will run the specified test script.

For example, if you have a bash script in your package, scripts/test:

#!/bin/bashecho"Hello, world!"

and the following in your package.json:

{"name":"my-tribute-package","version":"1.0.0","description":"This is not the best package in the world, this is just a tribute.","main":"index.js","author":"Yarn Contributor","license":"MIT","scripts":{"test":"scripts/test"}}

then running yarn test would yield:

$ yarn test yarn test v0.15.1 $ "./scripts/test" Hello, world! ✨ Done in 0.17s. 

yarn run test

yarn test is also a shortcut for yarn run test.