Created multi-process-friendly PowerMonitor interface.

content/common/power_monitor_broadcast_source_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/message_loop.h"
+#include "base/power_monitor/power_monitor_test_base.h"
+#include "content/common/power_monitor_broadcast_source.h"
+#include "content/common/power_monitor_messages.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace content {
+
+class PowerMonitorBroadcastSourceTest : public testing::Test {
+ protected:
+  PowerMonitorBroadcastSourceTest() {
+    power_monitor_source_ = new PowerMonitorBroadcastSource();
+    power_monitor_.reset(new base::PowerMonitor(power_monitor_source_));
+  }
+  virtual ~PowerMonitorBroadcastSourceTest() {}
+
+  PowerMonitorBroadcastSource* source() { return power_monitor_source_; }
+  base::PowerMonitor* monitor() { return power_monitor_.get(); }
+
+  base::MessageLoop message_loop_;
+
+ private:
+  PowerMonitorBroadcastSource* power_monitor_source_;
+  scoped_ptr<base::PowerMonitor> power_monitor_;
+
+  DISALLOW_COPY_AND_ASSIGN(PowerMonitorBroadcastSourceTest);
+};
+
+TEST_F(PowerMonitorBroadcastSourceTest, PowerMessageReceiveBroadcast) {
+  IPC::ChannelProxy::MessageFilter* message_filter = source()->MessageFilter();
+
+  base::PowerMonitorTestObserver observer;
+  monitor()->AddObserver(&observer);
+
+  PowerMonitorMsg_Suspend suspend_msg;
+  PowerMonitorMsg_Resume resume_msg;
+
+  // Sending resume when not suspended should have no effect.
+  message_filter->OnMessageReceived(resume_msg);
+  message_loop_.RunUntilIdle();
+  EXPECT_EQ(observer.resumes(), 0);
+
+  // Pretend we suspended.
+  message_filter->OnMessageReceived(suspend_msg);
+  message_loop_.RunUntilIdle();
+  EXPECT_EQ(observer.suspends(), 1);
+
+  // Send a second suspend notification.  This should be suppressed.
+  message_filter->OnMessageReceived(suspend_msg);
+  message_loop_.RunUntilIdle();
+  EXPECT_EQ(observer.suspends(), 1);
+
+  // Pretend we were awakened.
+  message_filter->OnMessageReceived(resume_msg);
+  message_loop_.RunUntilIdle();
+  EXPECT_EQ(observer.resumes(), 1);
+
+  // Send a duplicate resume notification.  This should be suppressed.
+  message_filter->OnMessageReceived(resume_msg);
+  message_loop_.RunUntilIdle();
+  EXPECT_EQ(observer.resumes(), 1);
+
+  /*PowerMonitorMsg_PowerStateChange on_battery_msg(true);

[bajones, 2013/07/12 18:55:08]

Testing these messages currently has me stumped. Parameterless messages (like
suspend and resume) work fine, but when I attempt to construct the
PowerStateChange messages, which takes a boolean, I get linker errors. Typically
these types of errors would be resolved by adding MODULENAME_EXPORT to a class,
but since the messages are defined by macros that's not an option.

I don't intend to commit this test until I can cover these cases, but I'm not
sure where to look to figure out the linker errors. Any suggestions for
applicable contacts or resources? 

+  PowerMonitorMsg_PowerStateChange off_battery_msg(false);
+
+  // Pretend the device has gone on battery power
+  message_filter->OnMessageReceived(on_battery_msg);
+  message_loop_.RunUntilIdle();
+  EXPECT_EQ(observer.power_state_changes(), 1);
+  EXPECT_EQ(observer.last_power_state(), true);
+
+  // Repeated indications the device is on battery power should be suppressed.
+  message_filter->OnMessageReceived(on_battery_msg);
+  message_loop_.RunUntilIdle();
+  EXPECT_EQ(observer.power_state_changes(), 1);
+
+  // Pretend the device has gone off battery power
+  message_filter->OnMessageReceived(off_battery_msg);
+  message_loop_.RunUntilIdle();
+  EXPECT_EQ(observer.power_state_changes(), 2);
+  EXPECT_EQ(observer.last_power_state(), false);
+
+  // Repeated indications the device is off battery power should be suppressed.
+  message_filter->OnMessageReceived(off_battery_msg);
+  message_loop_.RunUntilIdle();
+  EXPECT_EQ(observer.power_state_changes(), 2);*/
+}
+
+}  // namespace base