Add an assert to ensure UTF-8 locale when handling file paths.

client/tests/isolated_format_test.py

 #!/usr/bin/env python
 # Copyright 2014 The Swarming Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0 that
 # can be found in the LICENSE file.
 
 import hashlib
 import json
 import logging
 import os
-import shutil
 import sys
 import tempfile
 import unittest
 
 # net_utils adjusts sys.path.
 import net_utils
 
 import isolated_format
 from depot_tools import auto_stub
+from depot_tools import fix_encoding
+from utils import file_path
 from utils import tools
 
 import isolateserver_mock
 
 
 ALGO = hashlib.sha1
 
 
 class TestCase(net_utils.TestCase):
   def test_get_hash_algo(self):
     # Tests here assume ALGO is used for default namespaces, check this
     # assumption.
     self.assertIs(isolated_format.get_hash_algo('default'), ALGO)
     self.assertIs(isolated_format.get_hash_algo('default-gzip'), ALGO)
 
 
 class SymlinkTest(unittest.TestCase):
   def setUp(self):
     super(SymlinkTest, self).setUp()
     self.old_cwd = os.getcwd()
     self.cwd = tempfile.mkdtemp(prefix=u'isolate_')
     # Everything should work even from another directory.
     os.chdir(self.cwd)
 
   def tearDown(self):
     try:
       os.chdir(self.old_cwd)
-      shutil.rmtree(self.cwd)
+      file_path.rmtree(self.cwd)
     finally:
       super(SymlinkTest, self).tearDown()
 
   if sys.platform == 'darwin':
     def test_expand_symlinks_path_case(self):
       # Ensures that the resulting path case is fixed on case insensitive file
       # system.
       os.symlink('dest', os.path.join(self.cwd, 'link'))
       os.mkdir(os.path.join(self.cwd, 'Dest'))
       open(os.path.join(self.cwd, 'Dest', 'file.txt'), 'w').close()
@@ skipping 175 matching lines @@
           u's': 2181582786L,
         }
       },
     }
     m = isolated_format.save_isolated('foo', data)
     self.assertEqual([], m)
     self.assertEqual([('foo', data, True)], calls)
 
 
 if __name__ == '__main__':
+  fix_encoding.fix_encoding()
   if '-v' in sys.argv:
     unittest.TestCase.maxDiff = None
   logging.basicConfig(
       level=(logging.DEBUG if '-v' in sys.argv else logging.ERROR))
   unittest.main()