Welcome to the Groovy Testing Guide. It contains information of relevance to those writing developer tests or systems and acceptance tests.
If you want to try out CI with groovy in Jenkins - you can kick the tyres at CloudBees
This will setup a CI job (running tests and build, in Jenkins) and deploy the "pet store" app that uses the grails "pet store" demo app (you can use it for free). Prefer to set it up yourself, read here.