def METHOD_NAME(self):
    with get_child_case() as case:
        parent_case_id = case.get_indices()[0].referenced_id
        case_copier = CaseCopier(DOMAIN, to_owner='new_owner_id')
        case_id_pairs, errors = case_copier.copy_cases(
            [case.case_id, parent_case_id]
        )
        new_case_ids = [pair[1] for pair in case_id_pairs]
        new_cases = CommCareCase.objects.get_cases(new_case_ids, DOMAIN)
        self.assertEqual(len(new_cases), 2)
        mother_case = next(c for c in new_cases if c.type == 'mother')
        child_case = next(c for c in new_cases if c.type == 'child')
        self.assertEqual(mother_case.owner_id, 'new_owner_id')
        self.assertEqual(child_case.owner_id, 'new_owner_id')
        self.assertEqual(mother_case.get_indices(), [])
        self.assertEqual(len(child_case.get_indices()), 1)
        self.assertEqual(
            child_case.get_indices()[0].referenced_id,
            mother_case.case_id,
        )