Add media device attach notification mechanism.

base/system_monitor/system_monitor_unittest.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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/file_path.h"
+#include "base/test/mock_devices_changed_observer.h"
 #include "base/system_monitor/system_monitor.h"
+#include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 
 class PowerTest : public SystemMonitor::PowerObserver {
  public:
   PowerTest()
       : battery_(false),
         power_state_changes_(0),
         suspends_(0),
@@ skipping 67 matching lines @@
   system_monitor.ProcessPowerMessage(SystemMonitor::RESUME_EVENT);
   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();
   EXPECT_EQ(test[0].resumes(), 1);
 }
 
-class DevicesChangedTest : public SystemMonitor::DevicesChangedObserver {
- public:
-  DevicesChangedTest()
-      : changes_(0) {
-  }
-
-  // DevicesChangedObserver callbacks.
-  virtual void OnDevicesChanged() OVERRIDE {
-    changes_++;
-  }
-
-  // Test status counts.
-  int changes() const { return changes_; }
-
- private:
-  int changes_;  // Count of OnDevicesChanged notifications.
-
-  DISALLOW_COPY_AND_ASSIGN(DevicesChangedTest);
-};
-
 TEST(SystemMonitor, 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;
-  DevicesChangedTest test[kObservers];
-  for (int index = 0; index < kObservers; ++index)
-    system_monitor.AddDevicesChangedObserver(&test[index]);
+  MockDevicesChangedObserver observers[kObservers];
+  for (int index = 0; index < kObservers; ++index) {
+    system_monitor.AddDevicesChangedObserver(&observers[index]);
+
+    EXPECT_CALL(observers[index], OnDevicesChanged())
+        .Times(3)
+        .InSequence(mock_sequencer[index]);
+    EXPECT_CALL(observers[index], OnMediaDeviceAttached(1, "media device",
+                                                        testing::_))
+        .InSequence(mock_sequencer[index]);
+    EXPECT_CALL(observers[index], OnMediaDeviceDetached(1))
+        .InSequence(mock_sequencer[index]);
+    EXPECT_CALL(observers[index], OnMediaDeviceDetached(2))
+        .InSequence(mock_sequencer[index]);
+  }
 
   system_monitor.ProcessDevicesChanged();
   loop.RunAllPending();
-  EXPECT_EQ(1, test[0].changes());
 
   system_monitor.ProcessDevicesChanged();
   system_monitor.ProcessDevicesChanged();
   loop.RunAllPending();
-  EXPECT_EQ(3, test[0].changes());
+
+  system_monitor.ProcessMediaDeviceAttached(
+      1, "media device", FilePath(FILE_PATH_LITERAL("path")));
+  loop.RunAllPending();
+
+  system_monitor.ProcessMediaDeviceDetached(1);
+  system_monitor.ProcessMediaDeviceDetached(2);
+  loop.RunAllPending();
 }
 
 }  // namespace base