Fix unit test for system monitor.

base/system_monitor_unittest.cc

 // Copyright (c) 2008 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/system_monitor.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class PowerTest : public base::SystemMonitor::PowerObserver {
  public:
   PowerTest()
@@ skipping 15 matching lines @@
 
  private:
   bool battery_;   // Do we currently think we're on battery power.
   int power_state_changes_;  // Count of OnPowerStateChange notifications.
   int suspends_;  // Count of OnSuspend notifications.
   int resumes_;  // Count of OnResume notifications.
 };
 
 TEST(SystemMonitor, PowerNotifications) {
   const int kObservers = 5;
+
+  // Initialize a message loop for this to run on.
+  MessageLoop loop;
+  // Initialize time() since it registers as a SystemMonitor observer.
+  base::Time now = base::Time::Now();
+
   base::SystemMonitor* monitor = base::SystemMonitor::Get();
   PowerTest test[kObservers];
   for (int index = 0; index < kObservers; ++index)
     monitor->AddObserver(&test[index]);
 
   // Send a bunch of power changes.  Since the battery power hasn't
   // actually changed, we shouldn't get notifications.
   for (int index = 0; index < 5; index++) {
     monitor->ProcessPowerMessage(base::SystemMonitor::POWER_STATE_EVENT);
     EXPECT_EQ(test[0].power_state_changes(), 0);
   }
 
   // Sending resume when not suspended should have no effect.
   monitor->ProcessPowerMessage(base::SystemMonitor::RESUME_EVENT);
+  loop.RunAllPending();
   EXPECT_EQ(test[0].resumes(), 0);
 
   // Pretend we suspended.
   monitor->ProcessPowerMessage(base::SystemMonitor::SUSPEND_EVENT);
+  loop.RunAllPending();
   EXPECT_EQ(test[0].suspends(), 1);
 
   // Send a second suspend notification.  This should be suppressed.
   monitor->ProcessPowerMessage(base::SystemMonitor::SUSPEND_EVENT);
+  loop.RunAllPending();
   EXPECT_EQ(test[0].suspends(), 1);
 
   // Pretend we were awakened.
   monitor->ProcessPowerMessage(base::SystemMonitor::RESUME_EVENT);
+  loop.RunAllPending();
   EXPECT_EQ(test[0].resumes(), 1);
 
   // Send a duplicate resume notification.  This should be suppressed.
   monitor->ProcessPowerMessage(base::SystemMonitor::RESUME_EVENT);
+  loop.RunAllPending();
   EXPECT_EQ(test[0].resumes(), 1);
 }