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

appengine/swarming/server/bot_code_test.py

 #!/usr/bin/env python
 # Copyright 2014 The Swarming Authors. All rights reserved.
 # Use of this source code is governed by the Apache v2.0 license that can be
 # found in the LICENSE file.
 
 import StringIO
 import logging
 import os
 import re
-import shutil
 import subprocess
 import sys
 import tempfile
 import unittest
 import zipfile
 
 import test_env
 test_env.setup_test_env()
 
 from components import auth
 from test_support import test_case
 
 from server import bot_archive
 from server import bot_code
 
+CLIENT_DIR = os.path.join(
+    os.path.dirname(os.path.dirname(test_env.APP_DIR)), 'client')
+sys.path.insert(0, CLIENT_DIR)
+from third_party.depot_tools import fix_encoding
+from utils import file_path
+sys.path.pop(0)
+
 
 class BotManagementTest(test_case.TestCase):
   def setUp(self):
     super(BotManagementTest, self).setUp()
     self.testbed.init_user_stub()
 
     self.mock(
         auth, 'get_current_identity',
         lambda: auth.Identity(auth.IDENTITY_USER, 'joe@localhost'))
 
@@ skipping 30 matching lines @@
       with open(bot_path, 'wb') as f:
         f.write(zipped_code)
       proc = subprocess.Popen(
           [sys.executable, bot_path, 'start_bot', '-h'],
           cwd=temp_dir,
           stdout=subprocess.PIPE,
           stderr=subprocess.STDOUT)
       out = proc.communicate()[0]
       self.assertEqual(0, proc.returncode, out)
     finally:
-      shutil.rmtree(temp_dir)
+      file_path.rmtree(temp_dir)
 
 
 if __name__ == '__main__':
+  fix_encoding.fix_encoding()
   logging.basicConfig(
       level=logging.DEBUG if '-v' in sys.argv else logging.ERROR)
   unittest.main()