Exposes a shlib interface for media/audio path.

chromecast/media/audio/cast_audio_manager_factory_test.cc

Index: chromecast/media/audio/cast_audio_manager_factory_test.cc
diff --git a/chromecast/media/audio/cast_audio_manager_factory_test.cc b/chromecast/media/audio/cast_audio_manager_factory_test.cc
new file mode 100644
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+++ b/chromecast/media/audio/cast_audio_manager_factory_test.cc
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+// Copyright 2015 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 "chromecast/media/audio/cast_audio_manager.h"
+#include "chromecast/media/audio/cast_audio_manager_factory.h"
+#include "chromecast/public/cast_media_shlib.h"
+#include "chromecast/public/media/cast_audio_output_device.h"
+#include "media/audio/audio_manager.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace chromecast {
+namespace media {
+
+// This is a very simple test which verifies that setting a
+// CastAudioManagerFactory will delegate calls on AudioManager and
+// AudioOutputStream to to the CastMediaShlib layer. Testing the behavior of
+// each call in the AudioManager implementation itself shall occur elsewhere.
+TEST(CastAudioManagerFactoryTest, AudioOutputDeviceIsUsed) {
+  ::media::AudioManager::SetFactory(new CastAudioManagerFactory());
+  ::media::AudioManager* manager = ::media::AudioManager::CreateForTesting();
+  ASSERT_TRUE(manager);
+
+  // Check that the correct AudioManager is being used, and that the underlying
+  // delegate is the CastMediaShlib object.
+  const CastAudioOutputDevice* output_device =
+      CastMediaShlib::GetAudioOutputDevice();
+  ASSERT_TRUE(output_device);
+  CastAudioManager* cast_manager = reinterpret_cast<CastAudioManager*>(manager);
+  EXPECT_EQ(cast_manager->GetAudioOutputDeviceForTesting(), output_device);
+}
+
+}  // namespace media
+}  // namespace chromecast