Add unit tests for the 'disable-sync' flag

chrome/browser/sync/profile_sync_service_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 "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/run_loop.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 621 matching lines @@
             service()->GetLastSyncedTimeString());
 
   // Sign out.
   service()->DisableForUser();
   PumpLoop();
 
   EXPECT_EQ(l10n_util::GetStringUTF16(IDS_SYNC_TIME_NEVER),
             service()->GetLastSyncedTimeString());
 }
 
+// Verify that the disable sync flag disables sync.
+TEST_F(ProfileSyncServiceTest, DisableSyncFlag) {
+  base::CommandLine::ForCurrentProcess()->AppendSwitch(switches::kDisableSync);
+  EXPECT_FALSE(ProfileSyncService::IsSyncEnabled());
+}
+
+// Verify that no disable sync flag enables sync.
+TEST_F(ProfileSyncServiceTest, NoDisableSyncFlag) {
+  EXPECT_TRUE(ProfileSyncService::IsSyncEnabled());
+}
+
 }  // namespace
 }  // namespace browser_sync