I found how to get it and how to setup my machine at it's GitHub documentation (https://github.com/harrah/xsbt/wiki/Getting-Started-Setup), and now trying to make it work with my current code (https://bitbucket.org/ignasi35/scala-eclipse).
The main reason why I chose to test sbt is the continous testing:
- you can have sbt continually running (actually waiting for you to change something) and it will notice when something changed and compile and run it's tests. Actually, that's just a case of the actual feature: continous
so you are not limited to continous testing.