[pygobject] Add unit test for the TreeModelSort override

[Paolo Borelli <pborelli src gnome org>]

commit ee6da6f1aa2cd6e55834f9edc17f785613d00031
Author: Paolo Borelli <pborelli gnome org>
Date:   Wed Aug 15 13:16:11 2012 +0200

    Add unit test for the TreeModelSort override

 tests/test_overrides.py |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/tests/test_overrides.py b/tests/test_overrides.py
index 3990454..6e32f49 100644
--- a/tests/test_overrides.py
+++ b/tests/test_overrides.py
@@ -932,6 +932,13 @@ class TestGtk(unittest.TestCase):
             self.tester.assertEqual(int_value, self.int_value)
             self.tester.assertEqual(string_value, self.string_value)
 
+    def test_tree_model_sort(self):
+        self.assertEqual(Gtk.TreeModelSort, overrides.Gtk.TreeModelSort)
+        self.assertRaises(TypeError, Gtk.TreeModelSort)
+        model = Gtk.TreeStore(int, bool)
+        model_sort = Gtk.TreeModelSort(model)
+        self.assertEqual(model_sort.get_model(), model)
+
     def test_tree_store(self):
         self.assertEqual(Gtk.TreeStore, overrides.Gtk.TreeStore)
         self.assertEqual(Gtk.ListStore, overrides.Gtk.ListStore)