python3Packages.yapsy: use pytest and enable darwin

pkgs/development/python-modules/yapsy/default.nix

···
 , stdenv
 , buildPythonPackage
 , fetchPypi
+, pytestCheckHook
 }:
 
 buildPythonPackage rec {
···
     sha256 = "12rznbnswfw0w7qfbvmmffr9r317gl1rqg36nijwzsklkjgks4fq";
   };
 
+  nativeCheckInputs = [ pytestCheckHook ];
+
+  pythonImportsCheck = [ "yapsy" ];
+
   meta = with lib; {
     homepage = "https://yapsy.sourceforge.net/";
     description = "Yet another plugin system";
     license = licenses.bsd0;
-    # tests fail and are not using pytest to easily disable them
-    broken = stdenv.isDarwin;
   };
 }