Reverse in test gives me back a 404

Question

my test below returns a response 404. If I replace the 'party:detail' by '/party/party/1' , now it will pass. Per the documentation, I do pass the parameters correctly, so what is causing the issue?

class UrlTests(TestCase):
    def test_login_client(self):
        User.objects.create_user('buddy', 'me@me.com', 'password')
        self.client.login(username='buddy', password='password')
        response = self.client.get(reverse('party:detail', kwargs={'pk': '1'}))
        self.assertEqual(301, response.status_code)

demo\urls

urlpatterns = [
url(r'^party/', include('party.urls', namespace='party')), ]

party\urls

urlpatterns = [
url(r'^party/(?P<pk>[0-9]+)/$', login_required(PartyView.as_view()), name='detail'), ]

party\views

class PartyView(generic.DetailView):
    model = Party
    template_name = 'party/party.html'

    def get_queryset(self):
        return Party.objects.filter(pk=self.kwargs['pk'])