def METHOD_NAME(self, labels_management):
    self.client.force_login(self.staff)
    response = self.client.post(self.url, {"labels": [label.pk for label in self.labels]}, follow=True)
    self.assertEqual(list(self.content.labels.all()), self.labels)
    self.assertContains(response, "alert-box success")
    self.assertEqual(labels_management.send.call_count, 1)