def METHOD_NAME(self, tmpdir):
    """
    Given:
    - 'old_classifier': Old classifier to convert into 6_0_0 classifier.
    When:
    - Creating a 6_0_0 mapper convention from 5_9_9 and below classifier
    Then:
    - Ensure expected mapper is created in the expected path with the expected data.
    """
    fake_pack_name = "FakeTestPack"
    repo = Repo(tmpdir)
    repo_path = Path(repo.path)
    fake_pack = MockPack(repo_path / "Packs", fake_pack_name, repo)
    fake_pack.create_classifier(
        "Cymulate_5_9_9", util_load_json(self.OLD_CLASSIFIER_PATH)
    )
    fake_pack_path = fake_pack.path
    converter = ClassifierSixConverter(Pack(fake_pack_path))
    old_classifier = Classifier(self.OLD_CLASSIFIER_PATH)
    converter.create_mapper_from_old_classifier(old_classifier)
    mapper_path = f"{tmpdir}/Packs/FakeTestPack/Classifiers/classifier-mapper-incoming-Cymulate.json"
    self.assert_expected_file_output(
        mapper_path, "classifier-mapper-incoming-Cymulate"
    )