Remove git lockfile flakiness on win (bot_update)

tests/bot_update_coverage_test.py

 #!/usr/bin/env python
 # Copyright (c) 2015 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.
 
 import codecs
 import copy
 import json
 import os
 import sys
 import unittest
 
 #import test_env  # pylint: disable=W0403,W0611
 
 sys.path.insert(0, os.path.join(
     os.path.dirname(os.path.dirname(os.path.abspath(__file__))),
     'recipe_modules', 'bot_update', 'resources'))
-sys.platform = 'linux2'  # For consistency, ya know?
 import bot_update
 
 DEFAULT_PARAMS = {
     'solutions': [{
         'name': 'somename',
         'url': 'https://fake.com'
     }],
     'revisions': [],
     'first_sln': 'somename',
     'target_os': None,
@@ skipping 128 matching lines @@
       return self.files[target]
     return self.files[target]
 
 
 def fake_git(*args, **kwargs):
   return bot_update.call('git', *args, **kwargs)
 
 
 class BotUpdateUnittests(unittest.TestCase):
   def setUp(self):
+    sys.platform = 'linux2'  # For consistency, ya know?
     self.filesystem = FakeFilesystem()
     self.call = MockedCall(self.filesystem)
     self.gclient = MockedGclientSync(self.filesystem)
     self.call.expect(('gclient', 'sync')).returns(self.gclient)
     self.old_call = getattr(bot_update, 'call')
     self.params = copy.deepcopy(DEFAULT_PARAMS)
     setattr(bot_update, 'call', self.call)
     setattr(bot_update, 'git', fake_git)
 
     self.old_os_cwd = os.getcwd
@@ skipping 11 matching lines @@
 
   def testBasic(self):
     bot_update.ensure_checkout(**self.params)
     return self.call.records
 
   def testBasicShallow(self):
     self.params['shallow'] = True
     bot_update.ensure_checkout(**self.params)
     return self.call.records
 
+  def testBreakLocks(self):
+    sys.platform = 'win'
+    self.call.expect(('gclient.bat', 'sync')).returns(self.gclient)
+    bot_update.ensure_checkout(**self.params)
+    gclient_sync_cmd = None
+    for record in self.call.records:
+      args = record[0]
+      if args[0] == 'gclient.bat' and args[1] == 'sync':
+        gclient_sync_cmd = args
+    self.assertTrue('--break_repo_locks' in gclient_sync_cmd)
+
 
 if __name__ == '__main__':
   unittest.main()