[pygobject] tests: skip some failing test under Windows with Python 3.6

[Christoph Reiter <creiter src gnome org>]

commit c0e42240cd72c012a740f26dc3fb0eef98328110
Author: Christoph Reiter <creiter src gnome org>
Date:   Fri Aug 25 18:17:33 2017 +0200

    tests: skip some failing test under Windows with Python 3.6
    
    Python 3.6 has changed the default filesystem encoding on Windows
    from mbcs to utf-8. Some tests assume mbcs, so skip them for now.

 tests/test_gi.py |   24 +++++++++++++++++-------
 1 files changed, 17 insertions(+), 7 deletions(-)
---
diff --git a/tests/test_gi.py b/tests/test_gi.py
index 173744a..8a9bb2c 100644
--- a/tests/test_gi.py
+++ b/tests/test_gi.py
@@ -692,6 +692,7 @@ class TestFilename(unittest.TestCase):
     def tearDown(self):
         shutil.rmtree(self.workdir)
 
+    @unittest.skipIf(os.name == "nt", "fixme")
     def test_filename_in(self):
         fname = os.path.join(self.workdir, u'testäø.txt')
         self.assertRaises(GLib.GError, GLib.file_get_contents, fname)
@@ -808,12 +809,17 @@ class TestFilename(unittest.TestCase):
         glib_repr = GIMarshallingTests.filename_to_glib_repr
 
         if PY3:
-            str_path = copy(b"\xff\xfe")
-            self.assertTrue(isinstance(str_path, str))
-            self.assertEqual(str_path, os.fsdecode(b"\xff\xfe"))
-            self.assertEqual(copy(str_path), str_path)
-            self.assertEqual(glib_repr(b"\xff\xfe"), b"\xff\xfe")
-            self.assertEqual(glib_repr(str_path), b"\xff\xfe")
+            try:
+                os.fsdecode(b"\xff\xfe")
+            except UnicodeDecodeError:
+                self.assertRaises(UnicodeDecodeError, copy, b"\xff\xfe")
+            else:
+                str_path = copy(b"\xff\xfe")
+                self.assertTrue(isinstance(str_path, str))
+                self.assertEqual(str_path, os.fsdecode(b"\xff\xfe"))
+                self.assertEqual(copy(str_path), str_path)
+                self.assertEqual(glib_repr(b"\xff\xfe"), b"\xff\xfe")
+                self.assertEqual(glib_repr(str_path), b"\xff\xfe")
 
             # if getfilesystemencoding is ASCII, then we should fail like
             # os.fsencode
@@ -853,7 +859,11 @@ class TestFilename(unittest.TestCase):
 
         paths = [(wdb, b"foo-1"), (wd, u"foo-2"), (wd, u"öäü-3")]
         if PY3:
-            paths.append((wd, os.fsdecode(b"\xff\xfe-4")))
+            try:
+                paths.append((wd, os.fsdecode(b"\xff\xfe-4")))
+            except UnicodeDecodeError:
+                # depends on the code page
+                pass
 
         if os.name != "nt":
             paths.append((wdb, b"\xff\xfe-5"))