Devserver: allow SubversionFileSystem to be pinned to a specific rev on construction

chrome/common/extensions/docs/server2/subversion_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 fake_url_fetcher import FakeUrlFetcher
 from file_system import StatInfo
+from future import Future
 from subversion_file_system import SubversionFileSystem
 
 class SubversionFileSystemTest(unittest.TestCase):
   def setUp(self):
     self._base_path = os.path.join(sys.path[0], 'test_data', 'file_system')
 
   def _CreateSubversionFileSystem(self):
     fetcher = FakeUrlFetcher(self._base_path)
     return SubversionFileSystem(fetcher, fetcher, self._base_path)
 
@@ skipping 26 matching lines @@
       '151113',
       child_versions=json.loads(self._ReadLocalFile('stat_result.json'))
     )
     self.assertEquals(expected, stat_info)
 
   def testFileStat(self):
     file_system = self._CreateSubversionFileSystem()
     stat_info = file_system.Stat('stat/extension_api.h')
     self.assertEquals(StatInfo('146163'), stat_info)
 
+  def testRevisions(self):
+    # This is a super hacky test. Record the path that was fetched then exit the
+    # test. Compare.
+    class ValueErrorFetcher(object):
+      def __init__(self):
+        self.last_fetched = None
+
+      def FetchAsync(self, path):
+        self.last_fetched = path
+        raise ValueError()
+
+      def Fetch(self, path):
+        self.last_fetched = path
+        raise ValueError()
+
+    file_fetcher = ValueErrorFetcher()
+    stat_fetcher = ValueErrorFetcher()
+    svn_path = 'svn:'
+
+    svn_file_system = SubversionFileSystem(file_fetcher,
+                                           stat_fetcher,
+                                           svn_path,
+                                           revision=42)
+
+    self.assertRaises(ValueError, svn_file_system.ReadSingle, 'dir/file')
+    self.assertEqual('dir/file?p=42', file_fetcher.last_fetched)
+    # Stat() will always stat directories.
+    self.assertRaises(ValueError, svn_file_system.Stat, 'dir/file')
+    self.assertEqual('dir/?pathrev=42', stat_fetcher.last_fetched)
+
+    self.assertRaises(ValueError, svn_file_system.ReadSingle, 'dir/')
+    self.assertEqual('dir/?p=42', file_fetcher.last_fetched)
+    self.assertRaises(ValueError, svn_file_system.Stat, 'dir/')
+    self.assertEqual('dir/?pathrev=42', stat_fetcher.last_fetched)
+
 if __name__ == '__main__':
   unittest.main()