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