unittest with @login_required decorator

Question

I use tipfy & gae for my project. I write unittests, and I to be confronted with a question: How I can test the handler which has @login_required decorator?

class TestHandler(unittest.TestCase): 
    def setUp(self): 
        self.app = App(rules=rules, config=config, debug=True) 
        self.client = self.app.get_test_client() 
    def test_my_handler(self): 
        r = self.client.post('/service') 
        # hardworking 
        self.assertTrue(r.status_code == 200) 

How a can set 'self.auth.user' for current handler('/service')

Regards & thanks & sorry for my english )

Oleg