python3Packages.makefun: fix build, enable tests

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

@@ -2,6 +2,7 @@
 , fetchPypi
 , buildPythonPackage
 , setuptools-scm
+, pytestCheckHook
 }:
 
 buildPythonPackage rec {
@@ -13,13 +14,18 @@ buildPythonPackage rec {
     sha256 = "4d0e90ca3fdbdeb6a4a0891e2da7d4b8e80386e19e6db91ce29b8aa5c876ecfe";
   };
 
-  nativeBuildInputs = [ setuptools-scm ];
+  postPatch = ''
+    substituteInPlace setup.cfg \
+      --replace "pytest-runner" ""
+  '';
 
-  # Disabling tests for now due to various (transitive) dependencies on modules
-  # from @smarie which are, as of yet, not part of nixpkgs. Also introduces
-  # a tricky dependency: makefun tests depend on pytest-cases, installing
-  # pytest-cases depends on makefun.
-  doCheck = false;
+  nativeBuildInputs = [
+    setuptools-scm
+  ];
+
+  checkInputs = [
+    pytestCheckHook
+  ];
 
   pythonImportsCheck = [ "makefun" ];