Running tests against a selected file needs to be updated for Grails 3.x

[j4y]

This works in either the Project.groovy file or the ProjectTests.groovy file. The current implementation doesn't pass the package name, but it looks like this is required in grails 3.x

grails2.x: grails test-app Project

grails3.x: grails test-app some.package.ProjectTests

In addition, you can no longer pass in the class under test or it says there are no tests for it

No tests found for given includes: [some.package.Project]