Refer to the documentation of NativeScript CLI's ns test init command for usage.

If you encounter an issue, please log it at https://github.com/NativeScript/nativescript-cli/

If you see an error like this:

Error: connect ECONNREFUSED ::1:9876
 at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1195:16)

When using node 17 or higher, make sure your karma.conf.js contains a server hostname setting, for example:

// web server hostname (ensure this is present)
hostname: '127.0.0.1',
// web server port
port: 9876,

See here for changeset in CLI which adds that to all newly initialized unit test setups.