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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/timer/hi_res_timer_manager.h"
#include <memory>
#include <utility>
#include "base/base_switches.h"
#include "base/power_monitor/power_monitor.h"
#include "base/power_monitor/power_monitor_device_source.h"
#include "base/test/power_monitor_test.h"
#include "base/test/scoped_command_line.h"
#include "base/test/task_environment.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
#if BUILDFLAG(IS_WIN)
TEST(HiResTimerManagerTest, ToggleOnOff) {
test::TaskEnvironment task_environment;
base::test::ScopedPowerMonitorTestSource power_monitor_source;
HighResolutionTimerManager manager;
// Loop a few times to test power toggling.
for (int times = 0; times != 3; ++times) {
// The manager has the high resolution clock enabled now.
EXPECT_TRUE(manager.hi_res_clock_available());
// But the Time class has it off, because it hasn't been activated.
EXPECT_FALSE(base::Time::IsHighResolutionTimerInUse());
// Activate the high resolution timer.
base::Time::ActivateHighResolutionTimer(true);
EXPECT_TRUE(base::Time::IsHighResolutionTimerInUse());
// Simulate a on-battery power event.
power_monitor_source.GeneratePowerStateEvent(
PowerStateObserver::BatteryPowerStatus::kBatteryPower);
EXPECT_FALSE(manager.hi_res_clock_available());
EXPECT_FALSE(base::Time::IsHighResolutionTimerInUse());
// Back to on-AC power.
power_monitor_source.GeneratePowerStateEvent(
PowerStateObserver::BatteryPowerStatus::kExternalPower);
EXPECT_TRUE(manager.hi_res_clock_available());
EXPECT_TRUE(base::Time::IsHighResolutionTimerInUse());
// De-activate the high resolution timer.
base::Time::ActivateHighResolutionTimer(false);
}
}
TEST(HiResTimerManagerTest, DisableFromCommandLine) {
base::test::ScopedCommandLine command_line;
command_line.GetProcessCommandLine()->AppendSwitch(
switches::kDisableHighResTimer);
// Reset to known initial state. Test suite implementation
// enables the high resolution timer by default.
Time::EnableHighResolutionTimer(false);
HighResolutionTimerManager manager;
// The high resolution clock is disabled via the command line flag.
EXPECT_FALSE(manager.hi_res_clock_available());
// Time class has it off as well, because it hasn't been activated.
EXPECT_FALSE(base::Time::IsHighResolutionTimerInUse());
// Try to activate the high resolution timer.
base::Time::ActivateHighResolutionTimer(true);
EXPECT_FALSE(base::Time::IsHighResolutionTimerInUse());
// De-activate the high resolution timer.
base::Time::ActivateHighResolutionTimer(false);
// Re-enable the high-resolution timer for testing.
Time::EnableHighResolutionTimer(true);
}
#endif // BUILDFLAG(IS_WIN)
} // namespace base
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