Cannot run Grails tests

I am using IntelliJ IDEA 8.1.3 and just migrated from one machine to another. I re-installed IDEA, opened the project file, defined the SDK (it seemed to have forgotten where the SDK went), and tried running my tests. But I only get the JUnit test, not the grails one. I tried adding a grails test configuration through run/edit configurations, but that didn't seem to have any effect. Any idea about what to check to get the Grails tests to work again? They worked fine in the earlier installation...

Thanks,

Gene