luci-py: Making __file__ usage unicode safe.

client/tests/threading_utils_test.py

 #!/usr/bin/env python
 # Copyright 2013 The LUCI 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.
 
 # Lambda may not be necessary.
 # pylint: disable=W0108
 
 import functools
 import logging
 import os
 import signal
 import sys
 import threading
 import time
 import traceback
 import unittest
 
-ROOT_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+ROOT_DIR = os.path.dirname(os.path.dirname(os.path.abspath(
+    __file__.decode(sys.getfilesystemencoding()))))
 sys.path.insert(0, ROOT_DIR)
 
 from utils import threading_utils
 
 
 def timeout(max_running_time):
   """Test method decorator that fails the test if it executes longer
   than |max_running_time| seconds.
 
   It exists to terminate tests in case of deadlocks. There's a high chance that
@@ skipping 577 matching lines @@
       tp.add_task(0, channel.wrap_task(task_func))
       # 'Timeout' raised by task gets transformed into 'RuntimeError'.
       with self.assertRaises(RuntimeError):
         channel.pull()
 
 
 if __name__ == '__main__':
   VERBOSE = '-v' in sys.argv
   logging.basicConfig(level=logging.DEBUG if VERBOSE else logging.ERROR)
   unittest.main()