Created multi-process-friendly PowerMonitor interface.

base/power_monitor/power_monitor_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/power_monitor/power_monitor.h"
-
-#include "base/message_loop.h"
+#include "base/power_monitor/power_monitor_test_base.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 
-class PowerTest : public PowerObserver {
- public:
-  PowerTest()
-      : power_state_changes_(0),
-        suspends_(0),
-        resumes_(0) {
-  }
-
-  // PowerObserver callbacks.
-  virtual void OnPowerStateChange(bool on_battery_power) OVERRIDE {
-    power_state_changes_++;
-  }
-
-  virtual void OnSuspend() OVERRIDE {
-    suspends_++;
-  }
-
-  virtual void OnResume() OVERRIDE {
-    resumes_++;
-  }
-
-  // Test status counts.
-  int power_state_changes() { return power_state_changes_; }
-  int suspends() { return suspends_; }
-  int resumes() { return resumes_; }
-
- private:
-  int power_state_changes_;  // Count of OnPowerStateChange notifications.
-  int suspends_;  // Count of OnSuspend notifications.
-  int resumes_;  // Count of OnResume notifications.
-};
-
 class PowerMonitorTest : public testing::Test {
  protected:
   PowerMonitorTest() {
-#if defined(OS_MACOSX)
-    // This needs to happen before PowerMonitor's ctor.
-    PowerMonitor::AllocateSystemIOPorts();
-#endif
-    power_monitor_.reset(new PowerMonitor);
+    power_monitor_source_ = new PowerMonitorTestSource();
+    power_monitor_.reset(new PowerMonitor(
+        scoped_ptr<PowerMonitorSource>(power_monitor_source_)));
   }
+  virtual ~PowerMonitorTest() {};
 
-  void ProcessPowerEvent(PowerMonitor::PowerEvent event_id) {
-    power_monitor_->ProcessPowerEvent(event_id);
-  }
+  PowerMonitorTestSource* source() { return power_monitor_source_; }
+  PowerMonitor* monitor() { return power_monitor_.get(); }
 
-  virtual ~PowerMonitorTest() {}
-
-  MessageLoop message_loop_;
+ private:
+  PowerMonitorTestSource* power_monitor_source_;
   scoped_ptr<PowerMonitor> power_monitor_;
 
   DISALLOW_COPY_AND_ASSIGN(PowerMonitorTest);
 };
 
+// PowerMonitorSource is tightly coupled with the PowerMonitor, so this test
+// Will cover both classes
 TEST_F(PowerMonitorTest, PowerNotifications) {
   const int kObservers = 5;
 
-  PowerTest test[kObservers];
+  PowerMonitorTestObserver observers[kObservers];
   for (int index = 0; index < kObservers; ++index)
-    power_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++) {
-    ProcessPowerEvent(PowerMonitor::POWER_STATE_EVENT);
-    EXPECT_EQ(test[0].power_state_changes(), 0);
-  }
+    monitor()->AddObserver(&observers[index]);
 
   // Sending resume when not suspended should have no effect.
-  ProcessPowerEvent(PowerMonitor::RESUME_EVENT);
-  message_loop_.RunUntilIdle();
-  EXPECT_EQ(test[0].resumes(), 0);
+  source()->GenerateResumeEvent();
+  EXPECT_EQ(observers[0].resumes(), 0);
 
   // Pretend we suspended.
-  ProcessPowerEvent(PowerMonitor::SUSPEND_EVENT);
-  message_loop_.RunUntilIdle();
-  EXPECT_EQ(test[0].suspends(), 1);
+  source()->GenerateSuspendEvent();
+  // Ensure all observers were notified of the event
+  for (int index = 0; index < kObservers; ++index)
+    EXPECT_EQ(observers[index].suspends(), 1);
 
   // Send a second suspend notification.  This should be suppressed.
-  ProcessPowerEvent(PowerMonitor::SUSPEND_EVENT);
-  message_loop_.RunUntilIdle();
-  EXPECT_EQ(test[0].suspends(), 1);
+  source()->GenerateSuspendEvent();
+  EXPECT_EQ(observers[0].suspends(), 1);
 
   // Pretend we were awakened.
-  ProcessPowerEvent(PowerMonitor::RESUME_EVENT);
-  message_loop_.RunUntilIdle();
-  EXPECT_EQ(test[0].resumes(), 1);
+  source()->GenerateResumeEvent();
+  EXPECT_EQ(observers[0].resumes(), 1);
 
   // Send a duplicate resume notification.  This should be suppressed.
-  ProcessPowerEvent(PowerMonitor::RESUME_EVENT);
-  message_loop_.RunUntilIdle();
-  EXPECT_EQ(test[0].resumes(), 1);
+  source()->GenerateResumeEvent();
+  EXPECT_EQ(observers[0].resumes(), 1);
+
+  // Pretend the device has gone on battery power
+  source()->GeneratePowerStateEvent(true);
+  EXPECT_EQ(observers[0].power_state_changes(), 1);
+  EXPECT_EQ(observers[0].last_power_state(), true);
+
+  // Repeated indications the device is on battery power should be suppressed.
+  source()->GeneratePowerStateEvent(true);
+  EXPECT_EQ(observers[0].power_state_changes(), 1);
+
+  // Pretend the device has gone off battery power
+  source()->GeneratePowerStateEvent(false);
+  EXPECT_EQ(observers[0].power_state_changes(), 2);
+  EXPECT_EQ(observers[0].last_power_state(), false);
+
+  // Repeated indications the device is off battery power should be suppressed.
+  source()->GeneratePowerStateEvent(false);
+  EXPECT_EQ(observers[0].power_state_changes(), 2);
 }
 
 }  // namespace base