Django: How to associate a user with a request factory

I am writing some tests for a form on a Django site. I want to test that a logged in user is able to use the form assuming correct input. To that end, I am using a Django request factory. I can't seem to get my test user logged in though. That, or I'm not even making the request correctly. I'm not sure. Relevant code below:

def create_user():
        username = 'User '+id_generator()
        return User.objects.create(username = username, password = 'password')

def test_can_register_deck(self):
        t = create_empty_tourney()
        u = create_user()
        d = create_deck(u)
        rf = RequestFactory()
        request = rf.post(reverse('tourney:tourney', args=(t.slug,)),{'deck' : d})
        request.user = u
        response = self.client.get(reverse('tourney:tourney', args=(t.slug,)), request)
        self.assertEqual(response.status_code, 200)

The request has to think the user is logged in, or the rest of the test won't work. This throws no errors, but I'm not even sure my response is utilizing the request correctly. Am I correctly telling the test to "make a post request to the tourney page as this user, and try to submit a deck"?