base/hi_res_timer_manager_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/hi_res_timer_manager.h"
   6
   7 #include "base/memory/scoped_ptr.h"
   8 #include "base/message_loop.h"
   9 #include "base/power_monitor/power_monitor.h"
  10 #include "base/time.h"
  11 #include "testing/gtest/include/gtest/gtest.h"
  12
  13 #if defined(OS_WIN)
  14 // http://crbug.com/114048
  15 TEST(HiResTimerManagerTest, DISABLED_ToggleOnOff) {
  16   base::MessageLoop loop;
  17   scoped_ptr<base::PowerMonitor> power_monitor(new base::PowerMonitor());
  18   HighResolutionTimerManager manager;
  19
  20   // At this point, we don't know if the high resolution timers are on or off,
  21   // it depends on what system the tests are running on (for example, if this
  22   // test is running on a laptop/battery, then the PowerMonitor would have
  23   // already set the PowerState to battery power; but if we're running on a
  24   // desktop, then the PowerState will be non-battery power).  Simulate a power
  25   // level change to get to a deterministic state.
  26   manager.OnPowerStateChange(/* on_battery */ false);
  27
  28   // Loop a few times to test power toggling.
  29   for (int loop = 2; loop >= 0; --loop) {
  30     // The manager has the high resolution clock enabled now.
  31     EXPECT_TRUE(manager.hi_res_clock_available());
  32     // But the Time class has it off, because it hasn't been activated.
  33     EXPECT_FALSE(base::Time::IsHighResolutionTimerInUse());
  34
  35     // Activate the high resolution timer.
  36     base::Time::ActivateHighResolutionTimer(true);
  37     EXPECT_TRUE(base::Time::IsHighResolutionTimerInUse());
  38
  39     // Simulate a on-battery power event.
  40     manager.OnPowerStateChange(/* on_battery */ true);
  41     EXPECT_FALSE(manager.hi_res_clock_available());
  42     EXPECT_FALSE(base::Time::IsHighResolutionTimerInUse());
  43
  44     // Simulate a off-battery power event.
  45     manager.OnPowerStateChange(/* on_battery */ false);
  46     EXPECT_TRUE(manager.hi_res_clock_available());
  47     EXPECT_TRUE(base::Time::IsHighResolutionTimerInUse());
  48
  49     // De-activate the high resolution timer.
  50     base::Time::ActivateHighResolutionTimer(false);
  51   }
  52 }
  53 #endif  // defined(OS_WIN)