can't run grails tests in multi module maven project

I have a parent maven project with 2 modules, one of which is the grails proejct. When I try running an integration test and choose the GrailsTest configuration the base directory is set to the parent project and I get an error saying it's not a grails project. I've modified the defaults for the GrailsTests configuration to point to the grails project but still the base dir is set incorrectly. The Grails Application configuration works just fine and sets the base directory correctly. Is there anything I can do to get the tests to work? I am running 8.1.3 build 9886.