anchor.diff:  { lib
  +, stdenv
   , aiohttp
   , async-timeout
   , buildPythonPackage
  
positive.code: 
  buildPythonPackage rec {
    pname = "async-upnp-client";
    version = "0.19.1";
    disabled = pythonOlder "3.6";
  
    src = fetchFromGitHub {
      owner = "StevenLooman";
      repo = "async_upnp_client";
      rev = version;
      sha256 = "sha256-qxEn9UrQuwRaP7sZlu3854gDI7Gqku055DF8KvsU6p4=";
    };
  
    propagatedBuildInputs = [
  
negative.code:     "test_subscribe_renew"
      "test_start_server"
      "test_init"
    ] ++ lib.optionals stdenv.isDarwin [
      "test_deferred_callback_url"
    ];
  
    pythonImportsCheck = [ "async_upnp_client" ];
  