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

appengine/swarming/swarming_bot/main_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 json
 import os
 import re
-import shutil
 import sys
 import tempfile
 import unittest
 
 BOT_DIR = os.path.dirname(os.path.abspath(__file__))
 
 import test_env_bot
 test_env_bot.setup_test_env()
 
 from utils import subprocess42
 
 import fake_swarming
 from bot_code import bot_main
 from depot_tools import auto_stub
+from depot_tools import fix_encoding
+from utils import file_path
 
 
 class TestCase(auto_stub.TestCase):
   def setUp(self):
     super(TestCase, self).setUp()
     self._tmpdir = tempfile.mkdtemp(prefix='swarming_main')
     self._zip_file = os.path.join(self._tmpdir, 'swarming_bot.zip')
     code, _ = fake_swarming.gen_zip(self.url)
     with open(self._zip_file, 'wb') as f:
       f.write(code)
 
   def tearDown(self):
     try:
-      shutil.rmtree(self._tmpdir)
+      file_path.rmtree(self._tmpdir)
     finally:
       super(TestCase, self).tearDown()
 
 
 class SimpleMainTest(TestCase):
   @property
   def url(self):
     return 'http://localhost:1'
 
   def test_attributes(self):
@@ skipping 64 matching lines @@
       },
     ]
     if sys.platform == 'win32':
       # Sadly, the signal handler generate an error.
       # TODO(maruel): Fix one day.
       self.assertEqual(u'bot_error', events.pop(0)['event'])
     self.assertEqual(expected, events)
 
 
 if __name__ == '__main__':
+  fix_encoding.fix_encoding()
   if '-v' in sys.argv:
     unittest.TestCase.maxDiff = None
   unittest.main()