anchor.diff:  
     propagatedBuildInputs = with python3Packages; [
       dateutil configobj bibtexparser pyyaml requests beautifulsoup4
  -    pyfakefs ddt
     ];
  +
  +  checkInputs = with python3Packages; [ pyfakefs ddt ];
   
     preCheck = ''
       # API tests require networking
  
positive.code: { stdenv, fetchFromGitHub, python3Packages }:
  
  python3Packages.buildPythonApplication rec {
    name = "pubs-${version}";
    version = "0.7.0";
  
    src = fetchFromGitHub {
  
negative.code:     homepage = https://github.com/pubs/pubs;
      license = licenses.lgpl3;
      maintainers = with maintainers; [ gebner ];
    };
  }
  