Can we use Jest for unit test?

The example in the document uses mocha for unit test using de-red-node-test-helper .
Can we use Jest to test node?

We've not tried it, but please be our guest and try it for us. Feedback would be welcome.

You can use whatever you want. There is nothing tied to mocha in the test helper - it just provides a convenient way to start/stop the runtime with a test config.