python39Packages.ipywidgets: use pytestCheckHook and general cleanup

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

@@ -1,43 +1,35 @@
-{ lib
+{ buildPythonPackage
-, buildPythonPackage
 , fetchPypi
-, python
-, nose
-, pytest
-, mock
-, ipython
 , ipykernel
+, ipython
 , jupyterlab-widgets
+, lib
+, nbformat
+, pytestCheckHook
 , traitlets
-, notebook
 , widgetsnbextension
 }:
 
 buildPythonPackage rec {
   pname = "ipywidgets";
   version = "7.7.0";
+  format = "setuptools";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "sha256-q0pVloVaiLg3YZIcdocH1l5YRwaBObwXKd3+g0cDVCo=";
+    hash = "sha256-q0pVloVaiLg3YZIcdocH1l5YRwaBObwXKd3+g0cDVCo=";
   };
 
-  # Tests are not distributed
-  # doCheck = false;
-
-  buildInputs = [ nose pytest mock ];
   propagatedBuildInputs = [
     ipython
     ipykernel
     jupyterlab-widgets
     traitlets
-    notebook
+    nbformat
     widgetsnbextension
   ];
 
-  checkPhase = ''
+  checkInputs = [ pytestCheckHook ];
-    ${python.interpreter} -m unittest discover
-  '';
 
   meta = {
     description = "IPython HTML widgets for Jupyter";