Retrieve client_id from GoogleUpdateSettings when its missing from Local State.

components/metrics/metrics_state_manager_unittest.cc

 // Copyright 2014 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 "components/metrics/metrics_state_manager.h"
 
 #include <ctype.h>
 #include <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/prefs/testing_pref_service.h"
+#include "components/metrics/client_info.h"
 #include "components/metrics/metrics_pref_names.h"
 #include "components/metrics/metrics_switches.h"
 #include "components/variations/caching_permuted_entropy_provider.h"
 #include "components/variations/pref_names.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace metrics {
 
 class MetricsStateManagerTest : public testing::Test {
  public:
   MetricsStateManagerTest() : is_metrics_reporting_enabled_(false) {
     MetricsStateManager::RegisterPrefs(prefs_.registry());
   }
 
   scoped_ptr<MetricsStateManager> CreateStateManager() {
     return MetricsStateManager::Create(
         &prefs_,
         base::Bind(&MetricsStateManagerTest::is_metrics_reporting_enabled,
+                   base::Unretained(this)),
+        base::Bind(&MetricsStateManagerTest::MockStoreClientInfoBackup,
+                   base::Unretained(this)),
+        base::Bind(&MetricsStateManagerTest::LoadFakeClientInfoBackup,
                    base::Unretained(this))).Pass();
   }
 
   // Sets metrics reporting as enabled for testing.
   void EnableMetricsReporting() {
     is_metrics_reporting_enabled_ = true;
   }
 
  protected:
   TestingPrefServiceSimple prefs_;
 
  private:
   bool is_metrics_reporting_enabled() const {
     return is_metrics_reporting_enabled_;
   }
 
+  // Stores the |client_info| in |stored_client_info_backup_| for verification
+  // by the tests later.
+  void MockStoreClientInfoBackup(const ClientInfo& client_info) {
+    stored_client_info_backup_.reset(new ClientInfo);
+    stored_client_info_backup_->client_id = client_info.client_id;
+    stored_client_info_backup_->installation_date =
+        client_info.installation_date;
+    stored_client_info_backup_->reporting_enabled_date =
+        client_info.reporting_enabled_date;
+  }
+
+  // Hands off |fake_client_info_backup_| if it was set.
+  scoped_ptr<ClientInfo> LoadFakeClientInfoBackup() {
+    return fake_client_info_backup_.Pass();
+  }
+
   bool is_metrics_reporting_enabled_;
 
+  // Last ClientInfo store via MockStoreClientInfoBackup by the
+  // MetricsStateManager.
+  scoped_ptr<ClientInfo> stored_client_info_backup_;
+
+  // If set, will be returned via LoadFakeClientInfoBackup if requested by the
+  // MetricsStateManager.
+  scoped_ptr<ClientInfo> fake_client_info_backup_;
+
   DISALLOW_COPY_AND_ASSIGN(MetricsStateManagerTest);
 };
 
 // Ensure the ClientId is formatted as expected.
 TEST_F(MetricsStateManagerTest, ClientIdCorrectlyFormatted) {
   scoped_ptr<MetricsStateManager> state_manager(CreateStateManager());
   state_manager->ForceClientIdCreation();
 
   const std::string client_id = state_manager->client_id();
   EXPECT_EQ(36U, client_id.length());
@@ skipping 106 matching lines @@
 
     state_manager->GetLowEntropySource();
 
     EXPECT_FALSE(prefs_.GetBoolean(prefs::kMetricsResetIds));
   }
 
   EXPECT_NE(kInitialClientId, prefs_.GetString(prefs::kMetricsClientID));
 }
 
 }  // namespace metrics