def test_group(self):
        groups = RackGroup.objects.all()[:2]
        params = {'group_id': [groups[0].pk, groups[1].pk]}
        self.assertEqual(self.filterset(params, self.queryset).qs.count(), 2)
        params = {'group': [groups[0].slug, groups[1].slug]}
        self.assertEqual(self.filterset(params, self.queryset).qs.count(), 2)