luci-py: Making __file__ usage unicode safe.

client/tests/large_test.py

 #!/usr/bin/env python
 # Copyright 2016 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.
 
 import logging
 import os
 import random
 import sys
 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 large
 
 
 class LargeTest(unittest.TestCase):
   def test_1m_1(self):
     array = range(1000000)
     data = large.pack(array)
     self.assertGreater(1000, len(data))
@@ skipping 15 matching lines @@
 
   def test_empty(self):
     self.assertEqual('', large.pack([]))
     self.assertEqual([], large.unpack(''))
 
 
 if __name__ == '__main__':
   VERBOSE = '-v' in sys.argv
   logging.basicConfig(level=logging.DEBUG if VERBOSE else logging.ERROR)
   unittest.main()