anchor.diff:  { stdenv
  +, lib
   , buildPythonPackage
  +, isPyPy
   , fetchPypi
   , pytest_3
   , setuptools_scm
  
positive.code:     rm -v testing/test_channel.py
      rm -v testing/test_xspec.py
      rm -v testing/test_gateway.py
    '';
  
    checkPhase = ''
  
negative.code:     sha256 = "a7a84d5fa07a089186a329528f127c9d73b9de57f1a1131b82bb5320ee651f6a";
    };
  
    checkInputs = [ pytest_3 ];
    nativeBuildInputs = [ setuptools_scm ];
    propagatedBuildInputs = [ apipkg ];
  
  