django Tests with django-hosts host_url in Template

Question

Is there a way to work with host_url tags in tests?

template
{% load hosts %}
{% host_url 'www:index' host 'www' %}

test
@override_settings(DEFAULT_HOST='sub_domain', ROOT_URLCONF='sub_domain.urls')
class IndexViewTest(TestCase):
def setUp(self):
self.client = Client()
self.url = reverse_lazy('index')

def test_index_get(self):
    response = self.client.get(self.url)
    self.assertEqual(response.status_code, 200)

raises error django.urls.exceptions.NoReverseMatch: 'www' is not a registered namespace