python.pkgs.dot2tex: enable python3 and run tests

pkgs/development/python-modules/dot2tex/default.nix

@@ -1,8 +1,11 @@
 { stdenv
+, python
 , buildPythonPackage
 , fetchPypi
-, isPy3k
+, substituteAll
 , pyparsing
+, graphviz
+, texlive
 }:
 
 buildPythonPackage rec {
@@ -14,11 +17,26 @@ buildPythonPackage rec {
     sha256 = "1kp77wiv7b5qib82i3y3sn9r49rym43aaqm5aw1bwnzfbbq2m6i9";
   };
 
-  # Tests fail with 3.x. Furthermore, package is no longer maintained.
-  disabled = isPy3k;
+  patches = [
+    (substituteAll {
+      src = ./path.patch;
+      inherit graphviz;
+    })
+    ./test.patch # https://github.com/kjellmf/dot2tex/issues/5
+  ];
 
   propagatedBuildInputs = [ pyparsing ];
 
+  checkInputs = [
+    (texlive.combine {
+      inherit (texlive) scheme-small preview pstricks;
+    })
+  ];
+
+  checkPhase = ''
+    ${python.interpreter} tests/test_dot2tex.py
+  '';
+
   meta = with stdenv.lib; {
     description = "Convert graphs generated by Graphviz to LaTeX friendly formats";
     homepage = "https://github.com/kjellmf/dot2tex";