DriveFileSyncService listens to OnAuthenticated event to recover from unavailable state

chrome/browser/sync_file_system/drive_file_sync_client_unittest.cc

 // 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.
 
 #include "chrome/browser/sync_file_system/drive_file_sync_client.h"
 
 #include "base/json/json_reader.h"
 #include "base/message_loop.h"
 #include "base/message_loop_proxy.h"
 #include "chrome/browser/google_apis/drive_uploader.h"
@@ skipping 118 matching lines @@
   DriveFileSyncClientTest()
       : mock_drive_service_(NULL),
         fake_drive_uploader_(NULL) {
   }
 
   virtual void SetUp() OVERRIDE {
     mock_drive_service_ = new StrictMock<MockDriveService>;
     fake_drive_uploader_ = new FakeDriveUploader;
 
     EXPECT_CALL(*mock_drive_service_, Initialize(&profile_)).Times(1);
+    EXPECT_CALL(*mock_drive_service_, AddObserver(_));
 
     sync_client_ = DriveFileSyncClient::CreateForTesting(
         &profile_,
         scoped_ptr<DriveServiceInterface>(mock_drive_service_),
         scoped_ptr<DriveUploaderInterface>(fake_drive_uploader_)).Pass();
   }
 
   virtual void TearDown() OVERRIDE {
+    EXPECT_CALL(*mock_drive_service_, RemoveObserver(_));
     EXPECT_CALL(*mock_drive_service(), CancelAll());
     sync_client_.reset();
   }
 
  protected:
   DriveFileSyncClient* sync_client() { return sync_client_.get(); }
 
   std::string FormatOriginQuery(const GURL& origin) {
     return FormatTitleQuery(
         DriveFileSyncClient::OriginToDirectoryTitle(origin));
@@ skipping 687 matching lines @@
                             base::Bind(&DidDeleteFile, &done, &error));
   message_loop()->RunUntilIdle();
 
   EXPECT_TRUE(done);
   EXPECT_EQ(google_apis::HTTP_CONFLICT, error);
 }
 
 #endif  // !defined(OS_ANDROID)
 
 }  // namespace sync_file_system