Cleanup: Add test fixture for SystemMonitorTest to remove some redundant code.

base/system_monitor/system_monitor_unittest.cc

Index: base/system_monitor/system_monitor_unittest.cc
===================================================================
--- base/system_monitor/system_monitor_unittest.cc	(revision 138152)
+++ base/system_monitor/system_monitor_unittest.cc	(working copy)
@@ -12,6 +12,8 @@
 
 namespace base {
 
+namespace {
+
 class PowerTest : public SystemMonitor::PowerObserver {
  public:
   PowerTest()
@@ -47,69 +49,70 @@
   int resumes_;  // Count of OnResume notifications.
 };
 
-TEST(SystemMonitor, PowerNotifications) {
-  const int kObservers = 5;
-
-  // Initialize a message loop for this to run on.
-  MessageLoop loop;
-
+class SystemMonitorTest : public testing::Test {
+ protected:
+  SystemMonitorTest() {
 #if defined(OS_MACOSX)
-  SystemMonitor::AllocateSystemIOPorts();
+    // This needs to happen before SystemMonitor's ctor.
+    SystemMonitor::AllocateSystemIOPorts();
 #endif
+    system_monitor_.reset(new SystemMonitor);
+  }
+  virtual ~SystemMonitorTest() {}
 
-  SystemMonitor system_monitor;
+  MessageLoop message_loop_;
+  scoped_ptr<SystemMonitor> system_monitor_;
+
+  DISALLOW_COPY_AND_ASSIGN(SystemMonitorTest);
+};
+
+TEST_F(SystemMonitorTest, PowerNotifications) {
+  const int kObservers = 5;
+
   PowerTest test[kObservers];
   for (int index = 0; index < kObservers; ++index)
-    system_monitor.AddPowerObserver(&test[index]);
+    system_monitor_->AddPowerObserver(&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++) {
-    system_monitor.ProcessPowerMessage(SystemMonitor::POWER_STATE_EVENT);
+    system_monitor_->ProcessPowerMessage(SystemMonitor::POWER_STATE_EVENT);
     EXPECT_EQ(test[0].power_state_changes(), 0);
   }
 
   // Sending resume when not suspended should have no effect.
-  system_monitor.ProcessPowerMessage(SystemMonitor::RESUME_EVENT);
-  loop.RunAllPending();
+  system_monitor_->ProcessPowerMessage(SystemMonitor::RESUME_EVENT);
+  message_loop_.RunAllPending();
   EXPECT_EQ(test[0].resumes(), 0);
 
   // Pretend we suspended.
-  system_monitor.ProcessPowerMessage(SystemMonitor::SUSPEND_EVENT);
-  loop.RunAllPending();
+  system_monitor_->ProcessPowerMessage(SystemMonitor::SUSPEND_EVENT);
+  message_loop_.RunAllPending();
   EXPECT_EQ(test[0].suspends(), 1);
 
   // Send a second suspend notification.  This should be suppressed.
-  system_monitor.ProcessPowerMessage(SystemMonitor::SUSPEND_EVENT);
-  loop.RunAllPending();
+  system_monitor_->ProcessPowerMessage(SystemMonitor::SUSPEND_EVENT);
+  message_loop_.RunAllPending();
   EXPECT_EQ(test[0].suspends(), 1);
 
   // Pretend we were awakened.
-  system_monitor.ProcessPowerMessage(SystemMonitor::RESUME_EVENT);
-  loop.RunAllPending();
+  system_monitor_->ProcessPowerMessage(SystemMonitor::RESUME_EVENT);
+  message_loop_.RunAllPending();
   EXPECT_EQ(test[0].resumes(), 1);
 
   // Send a duplicate resume notification.  This should be suppressed.
-  system_monitor.ProcessPowerMessage(SystemMonitor::RESUME_EVENT);
-  loop.RunAllPending();
+  system_monitor_->ProcessPowerMessage(SystemMonitor::RESUME_EVENT);
+  message_loop_.RunAllPending();
   EXPECT_EQ(test[0].resumes(), 1);
 }
 
-TEST(SystemMonitor, DeviceChangeNotifications) {
+TEST_F(SystemMonitorTest, DeviceChangeNotifications) {
   const int kObservers = 5;
 
-  // Initialize a message loop for this to run on.
-  MessageLoop loop;
-
-#if defined(OS_MACOSX)
-  SystemMonitor::AllocateSystemIOPorts();
-#endif
-
   testing::Sequence mock_sequencer[kObservers];
-  SystemMonitor system_monitor;
   MockDevicesChangedObserver observers[kObservers];
   for (int index = 0; index < kObservers; ++index) {
-    system_monitor.AddDevicesChangedObserver(&observers[index]);
+    system_monitor_->AddDevicesChangedObserver(&observers[index]);
 
     EXPECT_CALL(observers[index], OnDevicesChanged())
         .Times(3)
@@ -123,56 +126,38 @@
         .InSequence(mock_sequencer[index]);
   }
 
-  system_monitor.ProcessDevicesChanged();
-  loop.RunAllPending();
+  system_monitor_->ProcessDevicesChanged();
+  message_loop_.RunAllPending();
 
-  system_monitor.ProcessDevicesChanged();
-  system_monitor.ProcessDevicesChanged();
-  loop.RunAllPending();
+  system_monitor_->ProcessDevicesChanged();
+  system_monitor_->ProcessDevicesChanged();
+  message_loop_.RunAllPending();
 
-  system_monitor.ProcessMediaDeviceAttached(
+  system_monitor_->ProcessMediaDeviceAttached(
       1, "media device", FilePath(FILE_PATH_LITERAL("path")));
-  loop.RunAllPending();
+  message_loop_.RunAllPending();
 
-  system_monitor.ProcessMediaDeviceDetached(1);
-  system_monitor.ProcessMediaDeviceDetached(2);
-  loop.RunAllPending();
+  system_monitor_->ProcessMediaDeviceDetached(1);
+  system_monitor_->ProcessMediaDeviceDetached(2);
+  message_loop_.RunAllPending();
 }
 
-TEST(SystemMonitor, GetAttachedMediaDevicesEmpty) {
-  // Initialize a message loop for this to run on.
-  MessageLoop loop;
-
-#if defined(OS_MACOSX)
-  SystemMonitor::AllocateSystemIOPorts();
-#endif
-
-  SystemMonitor system_monitor;
-
+TEST_F(SystemMonitorTest, GetAttachedMediaDevicesEmpty) {
   scoped_ptr<std::vector<SystemMonitor::MediaDeviceInfo> > devices;
-  devices.reset(system_monitor.GetAttachedMediaDevices());
+  devices.reset(system_monitor_->GetAttachedMediaDevices());
   EXPECT_EQ(0U, devices->size());
 }
 
-TEST(SystemMonitor, GetAttachedMediaDevicesAttachDetach) {
-  // Initialize a message loop for this to run on.
-  MessageLoop loop;
-
-#if defined(OS_MACOSX)
-  SystemMonitor::AllocateSystemIOPorts();
-#endif
-
-  SystemMonitor system_monitor;
-
+TEST_F(SystemMonitorTest, GetAttachedMediaDevicesAttachDetach) {
   const SystemMonitor::DeviceIdType kDeviceId1 = 42;
   const char kDeviceName1[] = "test";
   const FilePath kDevicePath1(FILE_PATH_LITERAL("/testfoo"));
-  system_monitor.ProcessMediaDeviceAttached(kDeviceId1,
-                                            kDeviceName1,
-                                            kDevicePath1);
-  loop.RunAllPending();
+  system_monitor_->ProcessMediaDeviceAttached(kDeviceId1,
+                                             kDeviceName1,
+                                             kDevicePath1);
+  message_loop_.RunAllPending();
   scoped_ptr<std::vector<SystemMonitor::MediaDeviceInfo> > devices;
-  devices.reset(system_monitor.GetAttachedMediaDevices());
+  devices.reset(system_monitor_->GetAttachedMediaDevices());
   ASSERT_EQ(1U, devices->size());
   EXPECT_EQ(kDeviceId1, (*devices)[0].a);
   EXPECT_EQ(kDeviceName1, (*devices)[0].b);
@@ -181,11 +166,11 @@
   const SystemMonitor::DeviceIdType kDeviceId2 = 44;
   const char kDeviceName2[] = "test2";
   const FilePath kDevicePath2(FILE_PATH_LITERAL("/testbar"));
-  system_monitor.ProcessMediaDeviceAttached(kDeviceId2,
-                                            kDeviceName2,
-                                            kDevicePath2);
-  loop.RunAllPending();
-  devices.reset(system_monitor.GetAttachedMediaDevices());
+  system_monitor_->ProcessMediaDeviceAttached(kDeviceId2,
+                                             kDeviceName2,
+                                             kDevicePath2);
+  message_loop_.RunAllPending();
+  devices.reset(system_monitor_->GetAttachedMediaDevices());
   ASSERT_EQ(2U, devices->size());
   EXPECT_EQ(kDeviceId1, (*devices)[0].a);
   EXPECT_EQ(kDeviceName1, (*devices)[0].b);
@@ -194,46 +179,46 @@
   EXPECT_EQ(kDeviceName2, (*devices)[1].b);
   EXPECT_EQ(kDevicePath2, (*devices)[1].c);
 
-  system_monitor.ProcessMediaDeviceDetached(kDeviceId1);
-  loop.RunAllPending();
-  devices.reset(system_monitor.GetAttachedMediaDevices());
+  system_monitor_->ProcessMediaDeviceDetached(kDeviceId1);
+  message_loop_.RunAllPending();
+  devices.reset(system_monitor_->GetAttachedMediaDevices());
   ASSERT_EQ(1U, devices->size());
   EXPECT_EQ(kDeviceId2, (*devices)[0].a);
   EXPECT_EQ(kDeviceName2, (*devices)[0].b);
   EXPECT_EQ(kDevicePath2, (*devices)[0].c);
 
-  system_monitor.ProcessMediaDeviceDetached(kDeviceId2);
-  loop.RunAllPending();
-  devices.reset(system_monitor.GetAttachedMediaDevices());
+  system_monitor_->ProcessMediaDeviceDetached(kDeviceId2);
+  message_loop_.RunAllPending();
+  devices.reset(system_monitor_->GetAttachedMediaDevices());
   EXPECT_EQ(0U, devices->size());
 }
 
-TEST(SystemMonitor, PowerRequirements) {
+TEST_F(SystemMonitorTest, PowerRequirements) {
 #if defined(OS_WIN)
-  MessageLoop loop;
-  SystemMonitor system_monitor;
-  ASSERT_EQ(0, system_monitor.GetPowerRequirementsCountForTest());
+  ASSERT_EQ(0, system_monitor_->GetPowerRequirementsCountForTest());
 
-  system_monitor.BeginPowerRequirement(SystemMonitor::TEST_REQUIRED, "foo");
-  ASSERT_EQ(1, system_monitor.GetPowerRequirementsCountForTest());
+  system_monitor_->BeginPowerRequirement(SystemMonitor::TEST_REQUIRED, "foo");
+  ASSERT_EQ(1, system_monitor_->GetPowerRequirementsCountForTest());
 
-  system_monitor.BeginPowerRequirement(SystemMonitor::TEST_REQUIRED, "bar");
-  ASSERT_EQ(2, system_monitor.GetPowerRequirementsCountForTest());
+  system_monitor_->BeginPowerRequirement(SystemMonitor::TEST_REQUIRED, "bar");
+  ASSERT_EQ(2, system_monitor_->GetPowerRequirementsCountForTest());
 
   // A second identical request should not increase the request count.
-  system_monitor.BeginPowerRequirement(SystemMonitor::TEST_REQUIRED, "bar");
-  ASSERT_EQ(2, system_monitor.GetPowerRequirementsCountForTest());
+  system_monitor_->BeginPowerRequirement(SystemMonitor::TEST_REQUIRED, "bar");
+  ASSERT_EQ(2, system_monitor_->GetPowerRequirementsCountForTest());
 
-  system_monitor.EndPowerRequirement(SystemMonitor::TEST_REQUIRED, "foo");
-  ASSERT_EQ(1, system_monitor.GetPowerRequirementsCountForTest());
+  system_monitor_->EndPowerRequirement(SystemMonitor::TEST_REQUIRED, "foo");
+  ASSERT_EQ(1, system_monitor_->GetPowerRequirementsCountForTest());
 
   // The request count should not decrease until all identical requests end.
-  system_monitor.EndPowerRequirement(SystemMonitor::TEST_REQUIRED, "bar");
-  ASSERT_EQ(1, system_monitor.GetPowerRequirementsCountForTest());
+  system_monitor_->EndPowerRequirement(SystemMonitor::TEST_REQUIRED, "bar");
+  ASSERT_EQ(1, system_monitor_->GetPowerRequirementsCountForTest());
 
-  system_monitor.EndPowerRequirement(SystemMonitor::TEST_REQUIRED, "bar");
-  ASSERT_EQ(0, system_monitor.GetPowerRequirementsCountForTest());
+  system_monitor_->EndPowerRequirement(SystemMonitor::TEST_REQUIRED, "bar");
+  ASSERT_EQ(0, system_monitor_->GetPowerRequirementsCountForTest());
 #endif  // defined(OS_WIN)
 }
 
+}  // namespace
+
 }  // namespace base