anchor.diff:    src = fetchFromGitHub {
       owner = "Yelp";
       repo = "swagger_spec_validator";
  -    rev = "v" + version;
  +    rev = "v${version}";
       sha256 = "sha256-7+kFmtzeze0QlGf6z/M4J4F7z771a5NWewB1S3+bxn4=";
     };
  -
  -  checkInputs = [
  -    pytest
  -    mock
  -  ];
  -
  -  checkPhase = ''
  -    pytest tests
  -  '';
   
     propagatedBuildInputs = [
       pyyaml
       jsonschema
       six
     ];
  +
  +  checkInputs = [
  +    pytestCheckHook
  +    mock
  +  ];
  +
  +  pythonImportsCheck = [ "swagger_spec_validator" ];
   
     meta = with lib; {
       homepage = "https://github.com/Yelp/swagger_spec_validator";
  
positive.code:     maintainers = with maintainers; [ vanschelven ];
    };
  }
  
  
  
negative.code: { lib, buildPythonPackage, fetchFromGitHub, pyyaml, jsonschema, six, pytestCheckHook, mock }:
  
  buildPythonPackage rec {
    pname = "swagger-spec-validator";
  