我有一个核心类，我试图在那里读取zip文件，解压缩，获取一个特定的文件，并获得该文件的内容。这工作得很好，但现在我试图模拟我在这一过程中使用的所有东西。

class ZipService:
    def __init__(self, path: str):
        self.path = path
    def get_manifest_json_object(self):
        s3 = boto3.resource('s3')
        bucket_name, key = self.__get_bucket_and_key()
        bucket = s3.Bucket(bucket_name)
        zip_object_reference = bucket.Object(key).get()["Body"]
        zip_object_bytes_stream = self.__get_zip_object_bytes_stream(zip_object_reference)
        zipf = zipfile.ZipFile(zip_object_bytes_stream, mode='r')
        return self.__get_manifest_json(zipf)

    def __get_bucket_and_key(self):
        pattern = "https:\/\/(.?[^\.]*)\.(.?[^\/]*)\/(.*)"  # this regex is working but don't know how :D
        result = re.split(pattern, self.path)
        return result[1], result[3]

    def __get_zip_object_bytes_stream(self, zip_object_reference):
        return io.BytesIO(zip_object_reference.read())

    def __get_manifest_json(self, zipf):
        manifest_json_text = [zipf.read(name) for name in zipf.namelist() if "/manifest.json" in name][0].decode("utf-8")
        return json.loads(manifest_json_text)

为此，我编写了一个抛出错误的测试用例：

@patch('boto3.resource')
class TestZipService(TestCase):

    def test_zip_service(self, mock):
        s3 = boto3.resource('s3')
        bucket = s3.Bucket("abc")
        bucket.Object.get.return_value = "some-value"
        zipfile.ZipFile.return_value = "/some-path"
        inst = ZipService("/some-path")
        with mock.patch.object(inst, "_ZipService__get_manifest_json", return_value={"a": "b"}) as some_object:
            expected = {"a": "b"}
            actual = inst.get_manifest_json_object()
            self.assertIsInstance(expected, actual)

错误：

bucket_name, key = self.__get_bucket_and_key()
  File "/Us.tox/py38/lib/python3.8/site-packages/services/zip_service.py", line 29, in __get_bucket_and_key
    return result[1], result[3]
IndexError: list index out of range

这里到底出了什么问题？任何提示也将不胜感激。TIA