Testing Closures transactional behaviour in service

class TestDataService {

   public void test(){
        new Customer(name:'Amit').save()
        addCustomerClosure()
        throw new RuntimeException("")
    }

    def addCustomerClosure = {
        new Customer(name:'Amit Jain').save()
    }

}


class TestDataController {
   def test={
        testDataService.test()
    }
}