Add some basic tests for metrics_daemon.

src/platform/metrics/metrics_daemon.h

 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef METRICS_DAEMON_H_
 #define METRICS_DAEMON_H_
 
 #include <dbus/dbus.h>
 #include <glib.h>
 #include <time.h>
 
+#include <gtest/gtest_prod.h>  // for FRIEND_TEST
+
 class MetricsDaemon {
 
  public:
   MetricsDaemon()
-      : network_state_(kUnknownNetworkState),
+      : daily_use_record_file_(NULL),
+        network_state_(kUnknownNetworkState),
         network_state_last_(0),
         power_state_(kUnknownPowerState),
         screensaver_state_(kUnknownScreenSaverState),
         session_state_(kUnknownSessionState),
         user_active_(false),
         user_active_last_(0),
         daily_use_day_last_(0),
         usemon_interval_(0),
         usemon_source_(NULL) {}
   ~MetricsDaemon() {}
 
   // Does all the work. If |run_as_daemon| is true, daemonizes by
-  // forking. If |testing| is true, logs the stats instead of sending
-  // them to Chrome.
-  void Run(bool run_as_daemon, bool testing);
+  // forking.
+  void Run(bool run_as_daemon);
 
  private:
+  friend class MetricsDaemonTest;
+  FRIEND_TEST(MetricsDaemonTest, LogDailyUseRecord);
+  FRIEND_TEST(MetricsDaemonTest, LookupNetworkState);
+  FRIEND_TEST(MetricsDaemonTest, LookupPowerState);
+  FRIEND_TEST(MetricsDaemonTest, LookupScreenSaverState);
+  FRIEND_TEST(MetricsDaemonTest, LookupSessionState);
+  FRIEND_TEST(MetricsDaemonTest, NetStateChanged);
+  FRIEND_TEST(MetricsDaemonTest, PowerStateChanged);
+  FRIEND_TEST(MetricsDaemonTest, PublishMetric);
+  FRIEND_TEST(MetricsDaemonTest, ScreenSaverStateChanged);
+  FRIEND_TEST(MetricsDaemonTest, SessionStateChanged);
+  FRIEND_TEST(MetricsDaemonTest, SetUserActiveState);
+
   // The network states (see network_states.h).
   enum NetworkState {
     kUnknownNetworkState = -1, // Initial/unknown network state.
 #define STATE(name, capname) kNetworkState ## capname,
 #include "network_states.h"
     kNumberNetworkStates
   };
 
   // The power states (see power_states.h).
   enum PowerState {
@@ skipping 20 matching lines @@
   };
 
   // Data record for aggregating daily usage.
   class UseRecord {
    public:
     UseRecord() : day_(0), seconds_(0) {}
     int day_;
     int seconds_;
   };
 
+  // Metric parameters.
+  static const char kMetricDailyUseTimeName[];
+  static const int kMetricDailyUseTimeMin;
+  static const int kMetricDailyUseTimeMax;
+  static const int kMetricDailyUseTimeBuckets;
+  static const char kMetricTimeToNetworkDropName[];
+  static const int kMetricTimeToNetworkDropMin;
+  static const int kMetricTimeToNetworkDropMax;
+  static const int kMetricTimeToNetworkDropBuckets;
+
   // D-Bus message match strings.
   static const char* kDBusMatches_[];
 
   // Array of network states.
   static const char* kNetworkStates_[kNumberNetworkStates];
 
   // Array of power states.
   static const char* kPowerStates_[kNumberPowerStates];
 
   // Array of screen-saver states.
@@ skipping 70 matching lines @@
 
   // Unschedules a scheduled use monitor, if any.
   void UnscheduleUseMonitor();
 
   // Sends a stat to Chrome for transport to UMA (or prints it for
   // testing). See MetricsLibrary::SendToChrome in metrics_library.h
   // for a description of the arguments.
   void PublishMetric(const char* name, int sample,
                      int min, int max, int nbuckets);
 
-  // Testing mode.
+  // Test mode.
   bool testing_;
 
+  const char* daily_use_record_file_;
+
   // Current network state.
   NetworkState network_state_;
 
   // Timestamps last network state update.
   time_t network_state_last_;
 
   // Current power state.
   PowerState power_state_;
 
   // Current screen-saver state.
@@ skipping 14 matching lines @@
 
   // Sleep period until the next daily usage aggregation performed by
   // the daily use monitor (see ScheduleUseMonitor).
   int usemon_interval_;
 
   // Scheduled daily use monitor source (see ScheduleUseMonitor).
   GSource* usemon_source_;
 };
 
 #endif  // METRICS_DAEMON_H_