[pygobject] Add test case for Gtk.ListStore custom sort

[Martin Pitt <martinpitt src gnome org>]

commit 3ae38d7519524288a57e5d522954b9d6725f0185
Author: Martin Pitt <martinpitt gnome org>
Date:   Mon Apr 23 18:47:34 2012 +0200

    Add test case for Gtk.ListStore custom sort
    
    This works in Python 2, but crashes in Python 3, another case of the segfaults
    we get when C calls a Python callback in Python 3.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=674475

 tests/test_overrides.py |   31 +++++++++++++++++++++++++++++++
 1 files changed, 31 insertions(+), 0 deletions(-)
---
diff --git a/tests/test_overrides.py b/tests/test_overrides.py
index 831970b..aef20e8 100644
--- a/tests/test_overrides.py
+++ b/tests/test_overrides.py
@@ -1241,6 +1241,37 @@ class TestGtk(unittest.TestCase):
 
         self.assertEqual(i, 102)
 
+    def test_list_store_sort(self):
+        def comp1(model, row1, row2, user_data):
+            v1 = model[row1][1]
+            v2 = model[row2][1]
+
+            # make "m" smaller than anything else
+            if v1.startswith('m') and not v2.startswith('m'):
+                return -1
+            if v2.startswith('m') and not v1.startswith('m'):
+                return 1
+            return cmp(v1, v2)
+
+        list_store = Gtk.ListStore(int, str)
+        list_store.set_sort_func(2, comp1, None)
+        list_store.append((1, 'apples'))
+        list_store.append((3, 'oranges'))
+        list_store.append((2, 'mango'))
+
+        # not sorted yet, should be original order
+        self.assertEqual([list(i) for i in list_store],
+                [[1, 'apples'], [3, 'oranges'], [2, 'mango']])
+
+        # sort with our custom function
+        list_store.set_sort_column_id(2, Gtk.SortType.ASCENDING)
+        self.assertEqual([list(i) for i in list_store],
+                [[2, 'mango'], [1, 'apples'], [3, 'oranges']])
+
+        list_store.set_sort_column_id(2, Gtk.SortType.DESCENDING)
+        self.assertEqual([list(i) for i in list_store],
+                [[3, 'oranges'], [1, 'apples'], [2, 'mango']])
+
     def test_list_store_signals(self):
         list_store = Gtk.ListStore(int, bool)