text: // Copyright 2013 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/power_monitor/power_monitor.h"
  #include "base/test/power_monitor_test_base.h"
  #include "testing/gtest/include/gtest/gtest.h"
  
  namespace base {
  
  class PowerMonitorTest : public testing::Test {
   protected:
    PowerMonitorTest() {
      power_monitor_source_ = new PowerMonitorTestSource();
      power_monitor_.reset(new PowerMonitor(
          scoped_ptr<PowerMonitorSource>(power_monitor_source_)));
    }
    ~PowerMonitorTest() override{};
  
    PowerMonitorTestSource* source() { return power_monitor_source_; }
    PowerMonitor* monitor() { return power_monitor_.get(); }
  
   private:
    PowerMonitorTestSource* power_monitor_source_;
    scoped_ptr<PowerMonitor> power_monitor_;
  
    DISALLOW_COPY_AND_ASSIGN(PowerMonitorTest);
  };
  
  // PowerMonitorSource is tightly coupled with the PowerMonitor, so this test
  // Will cover both classes
  TEST_F(PowerMonitorTest, PowerNotifications) {
    const int kObservers = 5;
  
    PowerMonitorTestObserver observers[kObservers];
    for (int index = 0; index < kObservers; ++index)
      monitor()->AddObserver(&observers[index]);
  
    // Sending resume when not suspended should have no effect.
    source()->GenerateResumeEvent();
    EXPECT_EQ(observers[0].resumes(), 0);
  
    // Pretend we suspended.
    source()->GenerateSuspendEvent();
    // Ensure all observers were notified of the event
    for (int index = 0; index < kObservers; ++index)
      EXPECT_EQ(observers[index].suspends(), 1);
  
    // Send a second suspend notification.  This should be suppressed.
    source()->GenerateSuspendEvent();
    EXPECT_EQ(observers[0].suspends(), 1);
  
    // Pretend we were awakened.
    source()->GenerateResumeEvent();
    EXPECT_EQ(observers[0].resumes(), 1);
  
    // Send a duplicate resume notification.  This should be suppressed.
    source()->GenerateResumeEvent();
    EXPECT_EQ(observers[0].resumes(), 1);
  
    // Pretend the device has gone on battery power
    source()->GeneratePowerStateEvent(true);
    EXPECT_EQ(observers[0].power_state_changes(), 1);
    EXPECT_EQ(observers[0].last_power_state(), true);
  
    // Repeated indications the device is on battery power should be suppressed.
    source()->GeneratePowerStateEvent(true);
    EXPECT_EQ(observers[0].power_state_changes(), 1);
  
    // Pretend the device has gone off battery power
    source()->GeneratePowerStateEvent(false);
    EXPECT_EQ(observers[0].power_state_changes(), 2);
    EXPECT_EQ(observers[0].last_power_state(), false);
  
    // Repeated indications the device is off battery power should be suppressed.
    source()->GeneratePowerStateEvent(false);
    EXPECT_EQ(observers[0].power_state_changes(), 2);
  }
  
  }  // namespace base
  