Refactor the devserver to make it easier to control caching

chrome/common/extensions/docs/server2/github_file_system_test.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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 json
 import os
 import sys
 import unittest
 
 from appengine_blobstore import AppEngineBlobstore
 from appengine_url_fetcher import AppEngineUrlFetcher
 from appengine_wrappers import files
 from fake_fetchers import ConfigureFakeFetchers
 from github_file_system import GithubFileSystem
 from in_memory_object_store import InMemoryObjectStore
 import url_constants
 
 class GithubFileSystemTest(unittest.TestCase):
   def setUp(self):
     ConfigureFakeFetchers(os.path.join(sys.path[0], os.pardir))
     self._base_path = os.path.join(sys.path[0],
                                    'test_data',
                                    'github_file_system')
     self._file_system = GithubFileSystem(
         AppEngineUrlFetcher(url_constants.GITHUB_URL),
-        InMemoryObjectStore('github'),
         AppEngineBlobstore())
 
   def _ReadLocalFile(self, filename):
     with open(os.path.join(self._base_path, filename), 'r') as f:
       return f.read()
 
   def testList(self):
     self.assertEqual(json.loads(self._ReadLocalFile('expected_list.json')),
                      self._file_system.Read(['/']).Get())
 
   def testRead(self):
    self.assertEqual(self._ReadLocalFile('expected_read.txt'),
                     self._file_system.ReadSingle('/analytics/launch.js'))
 
   def testStat(self):
     self.assertEqual(0, self._file_system.Stat('zipball').version)
 
   def testKeyGeneration(self):
     self.assertEqual(0, len(files.GetBlobKeys()))
     self._file_system.ReadSingle('/analytics/launch.js')
     self.assertEqual(1, len(files.GetBlobKeys()))
     self._file_system.ReadSingle('/analytics/main.css')
     self.assertEqual(1, len(files.GetBlobKeys()))
 
 if __name__ == '__main__':
   unittest.main()