pythonPackages.buildSetupcfg: Allow disabling tests.

# * meta: Standard nixpkgs metadata.

# * application: Whether this package is a python library or an

#   application which happens to be written in python.

pythonPackages: { src, info, meta ? {}, application ? false }: let

# * doCheck: Whether to run the test suites.

pythonPackages:

{ src, info, meta ? {}, application ? false, doCheck ? true }: let

  build = if application

    then pythonPackages.buildPythonApplication

  else pythonPackages.buildPythonPackage;

in build {

  inherit (info) pname version;

  inherit src meta;

  inherit src meta doCheck;

  nativeBuildInputs = map (p: pythonPackages.${p}) (

    (info.setup_requires or []) ++

    (info.tests_require or []));

    (if doCheck then (info.tests_require or []) else []));

  propagatedBuildInputs = map (p: pythonPackages.${p})

    (info.install_requires or []);