Allow content embedders to create AudioManager.

media/audio/audio_manager_factory_unittest.cc

-// 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 "base/test/test_message_loop.h"
-#include "base/thread_task_runner_handle.h"
-#include "media/audio/audio_manager.h"
-#include "media/audio/audio_manager_factory.h"
-#include "media/audio/fake_audio_manager.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace media {
-namespace {
-
-class FakeAudioManagerFactory : public AudioManagerFactory {
- public:
-  FakeAudioManagerFactory() {}
-  ~FakeAudioManagerFactory() override {}
-
-  ScopedAudioManagerPtr CreateInstance(
-      scoped_refptr<base::SingleThreadTaskRunner> task_runner,
-      scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner,
-      AudioLogFactory* audio_log_factory) override {
-    ScopedAudioManagerPtr instance(
-        new FakeAudioManager(std::move(task_runner),
-                             std::move(worker_task_runner), audio_log_factory));
-    // |created_instance_| is used for verifying. Ownership is transferred to
-    // caller.
-    created_instance_ = instance.get();
-    return instance;
-  }
-
-  AudioManager* created_instance() { return created_instance_; }
-
- private:
-  AudioManager* created_instance_;
-};
-
-}  // namespace
-
-// Verifies that SetFactory has the intended effect.
-TEST(AudioManagerFactoryTest, CreateInstance) {
-  {
-    base::TestMessageLoop message_loop;
-    // Create an audio manager and verify that it is not null.
-    ScopedAudioManagerPtr manager =
-        AudioManager::CreateForTesting(base::ThreadTaskRunnerHandle::Get());
-    ASSERT_NE(nullptr, manager.get());
-  }
-
-  // Set the factory. Note that ownership of |factory| is transferred to
-  // AudioManager.
-  FakeAudioManagerFactory* factory = new FakeAudioManagerFactory();
-  AudioManager::SetFactory(factory);
-  {
-    base::TestMessageLoop message_loop;
-    // Create the AudioManager instance. Verify that it matches the instance
-    // provided by the factory.
-    ScopedAudioManagerPtr manager =
-        AudioManager::CreateForTesting(base::ThreadTaskRunnerHandle::Get());
-    ASSERT_NE(nullptr, manager.get());
-    ASSERT_EQ(factory->created_instance(), manager.get());
-  }
-  // Reset AudioManagerFactory to prevent factory from persisting to other
-  // tests on the same process.
-  AudioManager::ResetFactoryForTesting();
-}
-
-}  // namespace media