我想为我的API模拟ConnectionError。我正在为一个软件创建一个python包，如果在localhost:8080上运行，它将正确地给予结果。但如果软件没有运行，那么我想抓住它。我可以使用httpx.ConnectError编写函数来获取这个异常，但是我如何编写测试呢？
我的功能是这样的

def get_workspace(self, workspace: str) -> Union[WorkspaceModel, GSResponse]:
        try:
            Client = self.http_client
            responses = Client.get(f"workspaces/{workspace}")
            if responses.status_code == 200:
                return WorkspaceModel.parse_obj(responses.json())
            else :
                results = self.response_recognise(responses)
                return results
        except httpx.TimeoutException as exc:
            res = {}
            res['code'] = 504
            res['response'] = "Timeout Error"
            return GSResponse.parse_obj(res)
        except httpx.NetworkError as exc:
            res = {}
            res['code'] = 503
            res['response'] = "Geoserver unavailable"
            return GSResponse.parse_obj(res)