setup:
        classProcessor = createProcessor([] as Set, [] as Set, ["*AnEmptyTestSuite"] as Set, [] as Set, [] as Set)

        //Run tests in AnEmptyTestSuite (e.g. no tests)
        when:
        process(AnEmptyTestSuite)

        then:
        1 * processor.started({ it.id == 1 && it.className == AnEmptyTestSuite.name }, { it.parentId == null})
        1 * processor.completed(1, { it.resultType == null })

}

@RunWith(Suite.class)
@Suite.SuiteClasses([ATestClass.class, BTestClass.class])
public class ATestSuite {
}

@RunWith(Suite.class)
@Suite.SuiteClasses([])
public class AnEmptyTestSuite {
}

public class CustomSuiteRunner extends Suite {
    public CustomSuiteRunner(Class<?> klass, RunnerBuilder builder) {
        super(builder, klass, ATestClass.class, BTestClass.class)
    }
}