Fix unicode upgrade of patch.

tests/patch_test.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Unit tests for patch.py."""
 
 import logging
 import os
 import posixpath
@@ skipping 257 matching lines @@
   def testSmallest(self):
     p = patch.FilePatchDiff('file_a', RAW.NEW_NOT_NULL, [])
     self._check_patch(p, 'file_a', RAW.NEW_NOT_NULL, is_new=True, nb_hunks=1)
 
   def testRenameOnlyHeader(self):
     p = patch.FilePatchDiff('file_b', RAW.MINIMAL_RENAME, [])
     self._check_patch(
         p, 'file_b', RAW.MINIMAL_RENAME, source_filename='file_a', is_new=True,
         nb_hunks=0)
 
+  def testUnicodeFilenameGet(self):
+    p = patch.FilePatchDiff(u'file_b', RAW.MINIMAL_RENAME, [])

[cmp, 2012/02/14 18:11:59]

This string (u'file_b') can be both encoded and decoded through 'utf-8'.  I
think a better test would be a unicode string that contains a unicode character
(like '\ua000') which can only be utf-8 encoded (u'\ua000' cannot be utf-8
decoded).  WDYT?

+    self.assertTrue(isinstance(p.get(False), str))
+    p.set_relpath('foo')
+    self.assertTrue(isinstance(p.get(False), str))
+
   def testGitCopyPartial(self):
     p = patch.FilePatchDiff('wtf2', GIT.COPY_PARTIAL, [])
     self._check_patch(
         p, 'wtf2', GIT.COPY_PARTIAL, source_filename='wtf', is_git_diff=True,
         patchlevel=1, is_new=True, nb_hunks=1)
 
   def testGitCopyPartialAsSvn(self):
     p = patch.FilePatchDiff('wtf2', GIT.COPY_PARTIAL, [])
     # TODO(maruel): Improve processing.
     diff = (
@@ skipping 210 matching lines @@
       self.fail()
     except patch.UnsupportedPatchFormat:
       pass
 
 
 if __name__ == '__main__':
   logging.basicConfig(level=
       [logging.WARNING, logging.INFO, logging.DEBUG][
         min(2, sys.argv.count('-v'))])
   unittest.main()