presubmit - don't check test functions for wstring

PRESUBMIT.py

 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Top-level presubmit script for Chromium.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into gcl.
 """
 
@@ skipping 97 matching lines @@
         '#include <ostream>. See http://crbug.com/94794',
         files) ]
   return []
 
 
 def _CheckNoNewWStrings(input_api, output_api):
   """Checks to make sure we don't introduce use of wstrings."""
   errors = []
   for f in input_api.AffectedFiles():
     for line_num, line in f.ChangedContents():
-      if not f.LocalPath().endswith(('.cc', '.h')):
+      if (not f.LocalPath().endswith(('.cc', '.h')) or
+          f.LocalPath().endswith('test.cc')):
         continue
 
       if 'wstring' in line:
         errors.append(output_api.PresubmitError(
             '%s, line %d: new code should not use wstrings.  If you are '
             'calling an API that accepts a wstring, fix the API.'
             % (f.LocalPath(), line_num)))
 
   return errors
 
@@ skipping 110 matching lines @@
   results.extend(input_api.canned_checks.CheckChangeHasBugField(
       input_api, output_api))
   results.extend(input_api.canned_checks.CheckChangeHasTestField(
       input_api, output_api))
   results.extend(_CheckSubversionConfig(input_api, output_api))
   return results
 
 
 def GetPreferredTrySlaves():
   return ['win', 'linux', 'mac']