anchor.diff:  
   buildPythonPackage rec {
     pname = "zigpy";
  -  version = "0.49.1";
  +  version = "0.50.2";
     format = "setuptools";
   
     disabled = pythonOlder "3.7";
  
positive.code:   ];
  
    checkInputs = [
      pytest-aiohttp
      pytest-timeout
      pytestCheckHook
    ]  ++ lib.optionals (pythonOlder "3.8") [
      asynctest
    ];
  
    disabledTests = [
      # RuntimeError: coroutine 'test_remigrate_forcibly_downgraded_v4' was never awaited
      #"test_remigrate_forcibly_downgraded_v4"
      # RuntimeError: Event loop is closed
      #"test_startup"
    ];
  
    pythonImportsCheck = [
  
negative.code: , buildPythonPackage
  , crccheck
  , cryptography
  , freezegun
  , fetchFromGitHub
  , pycryptodome
  , pytest-aiohttp
  