anchor.diff:  
     # 2 sftp tests fail (skip for now)
     # test_config relies on artifacts to be to downloaded
  +  # RSA tests don't have valid keys
     checkPhase = ''
       pytest tests \
         --ignore=tests/test_sftp.py \
  
positive.code:     sha256 = "920492895db8013f6cc0179293147f830b8c7b21fdfc839b6bad760c27459d9f";
    };
  
    checkInputs = [ invoke pytest mock pytest-relaxed ];
    propagatedBuildInputs = [ bcrypt cryptography pynacl pyasn1 ];
  
  
negative.code: { pkgs
  , buildPythonPackage
  , fetchPypi
  , fetchpatch
  , cryptography
  , bcrypt
  , invoke
  