How to use the taskcat._client_factory.ClientFactory function in taskcat

def client_factory_instance():
    with mock.patch.object(ClientFactory, "__init__", return_value=None):
        aws_clients = ClientFactory(None)
    aws_clients._credential_sets = {"default": [None, None, None, None]}
    return aws_clients

def client_factory_instance():
    with mock.patch.object(ClientFactory, "__init__", return_value=None):
        aws_clients = ClientFactory(None)
    aws_clients._credential_sets = {"default": [None, None, None, None]}
    return aws_clients

def client_factory_instance():
    with mock.patch.object(ClientFactory, "__init__", return_value=None):
        aws_clients = ClientFactory(None)
    aws_clients._credential_sets = {"default": [None, None, None, None]}
    return aws_clients

def client_factory_instance():
    with mock.patch.object(ClientFactory, "__init__", return_value=None):
        aws_clients = ClientFactory(None)
    aws_clients._credential_sets = {"default": [None, None, None, None]}
    return aws_clients

def __init__(
        self,
        path_to_templates,
        user_config_file=None,
        use_upstream_mappings=True,
        client_factory=None,
    ):
        if client_factory:
            AMIUpdater.client_factory = client_factory
        else:
            AMIUpdater.client_factory = ClientFactory()
        self.all_regions = False
        if use_upstream_mappings:
            Config.load(self.upstream_config_file, configtype="Upstream")
        if user_config_file:
            Config.load(user_config_file, configtype="User")
        self._template_path = path_to_templates

:param target_bucket_name: Target S3 bucket to use as replacement and to upload to
        :param source_bucket_name: Source S3 bucket to search for replacement
        :param target_key_prefix: Target S3 key prefix to prepend to all object (including an ending forward slash '/')
        :param output_directory: Directory to save rewritten assets to
        :param rewrite_mode: Mode for rewriting like CFNAlchemist.OBJECT_REWRITE_MODE or CFNAlchemist.BASIC_REWRITE_MODE
        :param verbose: Set to True to log debug messages
        :param dry_run: Set to True to perform a dry run
        """

        # Constants
        self._TEMPLATE_EXT = [".template", ".json", ".yaml", ".yml"]
        self._GIT_EXT = [".git", ".gitmodules", ".gitignore", ".gitattributes"]
        self._EXCLUDED_DIRS = [".git", "ci", ".idea", ".vs"]

        # properties
        self._boto_clients = ClientFactory(logger=self.logger)
        self._auth_mode = None
        self._aws_profile = None
        self._aws_access_key_id = None
        self._aws_secret_access_key = None
        self._aws_session_token = None

        # properties with setters/getters
        self._input_path = None
        self._target_bucket_name = None
        self._target_key_prefix = None
        self._output_directory = None
        self._rewrite_mode = self.OBJECT_REWRITE_MODE
        self._excluded_prefixes = None
        self._verbose = False
        self._dry_run = False
        self._prod_bucket_name = "aws-quickstart"