Add unit tests for the 'disable-sync' flag

BUG=454940

Review URL: https://codereview.chromium.org/902443002

Cr-Commit-Position: refs/heads/master@{#314673}

chrome/browser/sync/profile_sync_service_factory_unittest.cc

+// 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.
+
+#include "base/command_line.h"
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/sync/profile_sync_service_factory.h"
+#include "chrome/common/chrome_switches.h"
+#include "chrome/test/base/testing_profile.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+class ProfileSyncServiceFactoryTest : public testing::Test {
+ protected:
+  ProfileSyncServiceFactoryTest() {}
+
+  void SetUp() override {
+    profile_.reset(new TestingProfile());
+  }
+
+  scoped_ptr<Profile> profile_;
+};
+
+// Verify that the disable sync flag disables creation of the sync service.
+TEST_F(ProfileSyncServiceFactoryTest, DisableSyncFlag) {
+  base::CommandLine::ForCurrentProcess()->AppendSwitch(switches::kDisableSync);
+  EXPECT_EQ(nullptr, ProfileSyncServiceFactory::GetForProfile(profile_.get()));
+}

chrome/browser/sync/profile_sync_service_unittest.cc

@@ -639,5 +639,16 @@ TEST_F(ProfileSyncServiceTest, ClearLastSyncedTimeOnSignOut) {
             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

chrome/chrome_tests_unit.gypi

@@ -283,6 +283,7 @@
       'browser/sync/profile_sync_service_android_unittest.cc',
       'browser/sync/profile_sync_service_autofill_unittest.cc',
       'browser/sync/profile_sync_service_bookmark_unittest.cc',
+      'browser/sync/profile_sync_service_factory_unittest.cc',
       'browser/sync/profile_sync_service_startup_unittest.cc',
       'browser/sync/profile_sync_service_typed_url_unittest.cc',
       'browser/sync/profile_sync_service_unittest.cc',