base/power_monitor/power_monitor_unittest.cc

// 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/macros.h"
#include "base/message_loop/message_loop.h"
#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(
        std::unique_ptr<PowerMonitorSource>(power_monitor_source_)));
  }
  ~PowerMonitorTest() override = default;

  PowerMonitorTestSource* source() { return power_monitor_source_; }
  PowerMonitor* monitor() { return power_monitor_.get(); }

 private:
  base::MessageLoop message_loop_;
  PowerMonitorTestSource* power_monitor_source_;
  std::unique_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