Grails (JUnit) test suite

Question

Do JUnit test suites work in Grails?

I am writing a Groovy/Grails(2.1.2) project using IntelliJ.

Is it possible to run Spock tests as a JUnit test suite? I have tried:

package com.foo

import com.foo.functional.SampleFunctionalSpec
import org.junit.experimental.categories.Categories
import org.junit.runner.RunWith
import org.junit.runners.Suite

@RunWith(Categories.class)
@Categories.IncludeCategory(Category1.class)
@Suite.SuiteClasses( {SampleFunctionalSpec.class} )
class SampleTestSuite {
}

and

package com.foo.functional
import com.foo.*
import org.junit.experimental.categories.Category;

@Category(Category1.class)
class SampleFunctionalSpec extends BloomGebSpecCase {

    def "Sample test 1 with Category1"() {
        given:
        when:
        println "when"
        then:
        println "Sample test 1 with Category1"
    }
}

and

package com.foo

interface Category1 { }

and I get "Unable to attach test reporter to test framework..." when I run grails test-app functional SampleTestSuite from within IntelliJ.

EDIT: Also, just running a test suite with no categories gives same "Unattached" problem:

@RunWith(Suite.class)
@Suite.SuiteClasses( SampleFunctionalSpec.class )
class SampleTestSuite { }