I am using spring security core plugin (1.2.7) with grails 2.0

Let's say that I have controller with a method that uses @Secured annotation.

class ArticleController {
    def springSecurityService

    @Secured(['ROLE_PREMIUM_USER'])
    def listPremium() { 
        render 'premium content'
    }
}

in my unit test I would like to test if a user with role 'ROLE_PREMIUM_USER' can see content of listPremium method. How can I do this?

I know that it should start as follows:

@TestFor(ArticleController)
@Mock([SpringSecurityService])
class ArticleControllerTests {
    void testListPremium() {
    defineBeans {
        springSecurityService(SpringSecurityService)
    }
         //but how to login the user here in order to see premium content?

        controller.listPremium()
        assert response.text() == 'premium content'
    }
}

I am not sure how can I authenticate user or mock action that checks ROLE_PREMIUM_USER. Any help?

grails spring-security
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