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

client/tests/swarming_test.py

 #!/usr/bin/env python
 # Copyright 2013 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 datetime
 import hashlib
 import json
 import logging
 import os
 import StringIO
 import subprocess
 import sys
 import tempfile
 import threading
 import time
 import unittest
 
 # net_utils adjusts sys.path.
 import net_utils
 
 from depot_tools import auto_stub
 
 import auth
 import isolateserver
 import swarming
 import test_utils
 
+from depot_tools import fix_encoding
 from utils import file_path
 from utils import logging_utils
 from utils import tools
 
 import isolateserver_mock
 
 
 FILE_HASH = u'1' * 40
 TEST_NAME = u'unit_tests'
 
@@ skipping 1166 matching lines @@
           '--dimension', 'os', 'Linux', '--dead-only',
         ])
     expected = (
         u'swarm1\n  {"cores": ["8"], "cpu": ["x86", "x86-64"], "gpu": [], '
           '"id": ["swarm1"], "os": ["Linux", "Linux-12.04"]}\n')
     self._check_output(expected, '')
     self.assertEqual(0, ret)
 
 
 if __name__ == '__main__':
+  fix_encoding.fix_encoding()
   logging.basicConfig(
       level=logging.DEBUG if '-v' in sys.argv else logging.CRITICAL)
   if '-v' in sys.argv:
     unittest.TestCase.maxDiff = None
   for e in ('ISOLATE_SERVER', 'SWARMING_TASK_ID', 'SWARMING_SERVER'):
     os.environ.pop(e, None)
   unittest.main()