text: // 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 "media/audio/sounds/audio_stream_handler.h"
  
  #include <memory>
  
  #include "base/bind.h"
  #include "base/bind_helpers.h"
  #include "base/compiler_specific.h"
  #include "base/macros.h"
  #include "base/run_loop.h"
  #include "base/test/test_message_loop.h"
  #include "base/threading/thread_task_runner_handle.h"
  #include "media/audio/audio_io.h"
  #include "media/audio/audio_manager.h"
  #include "media/audio/simple_sources.h"
  #include "media/audio/sounds/test_data.h"
  #include "media/base/channel_layout.h"
  #include "testing/gtest/include/gtest/gtest.h"
  
  namespace media {
  
  class AudioStreamHandlerTest : public testing::Test {
   public:
    AudioStreamHandlerTest() {}
    ~AudioStreamHandlerTest() override {}
  
    void SetUp() override {
      audio_manager_ =
          AudioManager::CreateForTesting(base::ThreadTaskRunnerHandle::Get());
      base::RunLoop().RunUntilIdle();
  
      base::StringPiece data(kTestAudioData, arraysize(kTestAudioData));
      audio_stream_handler_.reset(new AudioStreamHandler(data));
    }
  
    void TearDown() override {
      audio_stream_handler_.reset();
      base::RunLoop().RunUntilIdle();
    }
  
    AudioStreamHandler* audio_stream_handler() {
      return audio_stream_handler_.get();
    }
  
    void SetObserverForTesting(AudioStreamHandler::TestObserver* observer) {
      AudioStreamHandler::SetObserverForTesting(observer);
    }
  
    void SetAudioSourceForTesting(
        AudioOutputStream::AudioSourceCallback* source) {
      AudioStreamHandler::SetAudioSourceForTesting(source);
    }
  
   private:
    base::TestMessageLoop message_loop_;
    ScopedAudioManagerPtr audio_manager_;
    std::unique_ptr<AudioStreamHandler> audio_stream_handler_;
  };
  
  TEST_F(AudioStreamHandlerTest, Play) {
    base::RunLoop run_loop;
    TestObserver observer(run_loop.QuitClosure());
  
    SetObserverForTesting(&observer);
  
    ASSERT_TRUE(audio_stream_handler()->IsInitialized());
    EXPECT_EQ(base::TimeDelta::FromMicroseconds(20u),
              audio_stream_handler()->duration());
  
    ASSERT_TRUE(audio_stream_handler()->Play());
  
    run_loop.Run();
  
    SetObserverForTesting(NULL);
  
    ASSERT_EQ(1, observer.num_play_requests());
    ASSERT_EQ(1, observer.num_stop_requests());
    ASSERT_EQ(4, observer.cursor());
  }
  
  TEST_F(AudioStreamHandlerTest, ConsecutivePlayRequests) {
    base::RunLoop run_loop;
    TestObserver observer(run_loop.QuitClosure());
    SineWaveAudioSource source(CHANNEL_LAYOUT_STEREO, 200.0, 8000);
  
    SetObserverForTesting(&observer);
    SetAudioSourceForTesting(&source);
  
    ASSERT_TRUE(audio_stream_handler()->IsInitialized());
    EXPECT_EQ(base::TimeDelta::FromMicroseconds(20u),
              audio_stream_handler()->duration());
  
    ASSERT_TRUE(audio_stream_handler()->Play());
    base::MessageLoop::current()->PostDelayedTask(
        FROM_HERE,
        base::Bind(base::IgnoreResult(&AudioStreamHandler::Play),
                   base::Unretained(audio_stream_handler())),
        base::TimeDelta::FromSeconds(1));
    base::MessageLoop::current()->PostDelayedTask(
        FROM_HERE,
        base::Bind(&AudioStreamHandler::Stop,
                   base::Unretained(audio_stream_handler())),
        base::TimeDelta::FromSeconds(2));
  
    run_loop.Run();
  
    SetObserverForTesting(NULL);
    SetAudioSourceForTesting(NULL);
  
    ASSERT_EQ(1, observer.num_play_requests());
    ASSERT_EQ(1, observer.num_stop_requests());
  }
  
  TEST_F(AudioStreamHandlerTest, BadWavDataDoesNotInitialize) {
    // The class members and SetUp() will be ignored for this test. Create a
    // handler on the stack with some bad WAV data.
    AudioStreamHandler handler("RIFF1234WAVEjunkjunkjunkjunk");
    EXPECT_FALSE(handler.IsInitialized());
    EXPECT_FALSE(handler.Play());
    EXPECT_EQ(base::TimeDelta(), handler.duration());
  
    // Call Stop() to ensure that there is no crash.
    handler.Stop();
  }
  
  }  // namespace media
  