python.pkgs.wakeonlan: fix build

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

@@ -1,4 +1,4 @@
-{ stdenv, fetchPypi, buildPythonPackage }:
+{ stdenv, fetchPypi, buildPythonPackage, setuptools_scm, pytest, mock }:
 
 buildPythonPackage rec {
   pname = "wakeonlan";
@@ -9,6 +9,19 @@ buildPythonPackage rec {
     sha256 = "5e6013a17004809e676c150689abd94bcc0f12a37ad3fbce1f6270968f95ffa9";
   };
 
+  postPatch = ''
+    substituteInPlace setup.py \
+      --replace "setuptools-scm ~= 1.15.7" "setuptools-scm"
+  '';
+
+  checkInputs = [ pytest mock ];
+
+  nativeBuildInputs = [ setuptools_scm ];
+
+  checkPhase = ''
+    py.test
+  '';
+
   meta = with stdenv.lib; {
     description = "A small python module for wake on lan";
     homepage = https://github.com/remcohaszing/pywakeonlan;