Implement GetAudioOutputDeviceNames for Mac OS X.

media/audio/audio_manager_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/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "media/audio/audio_manager.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 #if defined(OS_LINUX)
@@ skipping 14 matching lines @@
   for (AudioDeviceNames::iterator it = device_names.begin();
        it != device_names.end();
        ++it) {
     EXPECT_FALSE(it->unique_id.empty());
     EXPECT_FALSE(it->device_name.empty());
     VLOG(2) << "Device ID(" << it->unique_id << "), label: " << it->device_name;
   }
 }
 
 TEST(AudioManagerTest, GetAudioOutputDeviceNames) {
+  // On Linux, we may be able to test both the Alsa and Pulseaudio
+  // versions of the audio manager.
 #if defined(USE_PULSEAUDIO)
   {
     VLOG(2) << "Testing AudioManagerPulse.";
     scoped_ptr<AudioManager> pulse_audio_manager(AudioManagerPulse::Create());
     if (pulse_audio_manager.get())
       GetAudioOutputDeviceNamesImpl(pulse_audio_manager.get());
     else
       LOG(WARNING) << "No pulseaudio on this system.";
   }
 #endif  // defined(USE_PULSEAUDIO)
 #if defined(USE_ALSA)
   {
     VLOG(2) << "Testing AudioManagerLinux.";
     scoped_ptr<AudioManager> alsa_audio_manager(new AudioManagerLinux());
     GetAudioOutputDeviceNamesImpl(alsa_audio_manager.get());
   }
 #endif  // defined(USE_ALSA)
+
+#if defined(OS_MACOSX)
+  VLOG(2) << "Testing platform-default AudioManager.";
+  scoped_ptr<AudioManager> audio_manager(AudioManager::Create());
+  GetAudioOutputDeviceNamesImpl(audio_manager.get());
+#endif  // defined(OS_MACOSX)
 }
 
 }  // namespace media