pythonPackages.dbus: missing test dependency

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

@@ -1,5 +1,5 @@
 { stdenv, fetchurl, python, pkgconfig, dbus, dbus_glib, dbus_tools, isPyPy
-, ncurses }:
+, ncurses, pygobject3 }:
 
 if isPyPy then throw "dbus-python not supported for interpreter ${python.executable}" else stdenv.mkDerivation rec {
   name = "dbus-python-1.2.4";
@@ -12,7 +12,7 @@ if isPyPy then throw "dbus-python not supported for interpreter ${python.executa
   postPatch = "patchShebangs .";
 
   buildInputs = [ python pkgconfig dbus dbus_glib ]
-    ++ stdenv.lib.optional doCheck dbus_tools
+    ++ stdenv.lib.optionals doCheck [ dbus_tools pygobject3 ]
     # My guess why it's sometimes trying to -lncurses.
     # It seems not to retain the dependency anyway.
     ++ stdenv.lib.optional (! python ? modules) ncurses;