def METHOD_NAME(self):
    new_owner_id = 'new_owner_id'
    res = self.make_post({'case_ids': self.case_ids, 'owner_id': new_owner_id})
    self.assertEqual(json.loads(res.content)['copied_cases'], len(self.case_ids))
    copied_case_ids = CommCareCase.objects.get_case_ids_in_domain_by_owners(self.domain, [new_owner_id])
    self.assertEqual(len(copied_case_ids), len(self.case_ids))
    self.assertTrue(sorted(copied_case_ids) != sorted(self.case_ids))