Revert of Removing unused audio device tests

webrtc/modules/audio_device/test/audio_device_test_api.cc

Index: webrtc/modules/audio_device/test/audio_device_test_api.cc
diff --git a/webrtc/modules/audio_device/test/audio_device_test_api.cc b/webrtc/modules/audio_device/test/audio_device_test_api.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e36fc1d2cdf6e08ab4423daa49da6d4b42861495
--- /dev/null
+++ b/webrtc/modules/audio_device/test/audio_device_test_api.cc
@@ -0,0 +1,1609 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <math.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <memory>
+
+#include "webrtc/modules/audio_device/test/audio_device_test_defines.h"
+
+#include "webrtc/test/gtest.h"
+#include "webrtc/test/testsupport/fileutils.h"
+
+#include "webrtc/modules/audio_device/audio_device_config.h"
+#include "webrtc/modules/audio_device/audio_device_impl.h"
+#include "webrtc/modules/utility/include/process_thread.h"
+#include "webrtc/system_wrappers/include/sleep.h"
+
+// Helper functions
+#if defined(ANDROID)
+char filenameStr[2][256] =
+{ {0},
+  {0},
+}; // Allow two buffers for those API calls taking two filenames
+int currentStr = 0;
+
+const char* GetFilename(const char* filename)
+{
+  currentStr = !currentStr;
+  sprintf(filenameStr[currentStr], "/sdcard/admtest/%s", filename);
+  return filenameStr[currentStr];
+}
+#elif !defined(WEBRTC_IOS)
+const char* GetFilename(const char* filename) {
+  std::string full_path_filename = webrtc::test::OutputPath() + filename;
+  return full_path_filename.c_str();
+}
+#endif
+
+using namespace webrtc;
+
+class AudioEventObserverAPI: public AudioDeviceObserver {
+ public:
+  AudioEventObserverAPI(
+      const rtc::scoped_refptr<AudioDeviceModule>& audioDevice)
+      : error_(kRecordingError),
+        warning_(kRecordingWarning),
+        audio_device_(audioDevice) {}
+
+  ~AudioEventObserverAPI() override {}
+
+  void OnErrorIsReported(const ErrorCode error) override {
+    TEST_LOG("\n[*** ERROR ***] => OnErrorIsReported(%d)\n\n", error);
+    error_ = error;
+  }
+
+  void OnWarningIsReported(const WarningCode warning) override {
+    TEST_LOG("\n[*** WARNING ***] => OnWarningIsReported(%d)\n\n", warning);
+    warning_ = warning;
+    EXPECT_EQ(0, audio_device_->StopRecording());
+    EXPECT_EQ(0, audio_device_->StopPlayout());
+  }
+
+ public:
+  ErrorCode error_;
+  WarningCode warning_;
+ private:
+  rtc::scoped_refptr<AudioDeviceModule> audio_device_;
+};
+
+class AudioTransportAPI: public AudioTransport {
+ public:
+  AudioTransportAPI(const rtc::scoped_refptr<AudioDeviceModule>& audioDevice)
+      : rec_count_(0),
+        play_count_(0) {
+  }
+
+  ~AudioTransportAPI() override {}
+
+  int32_t RecordedDataIsAvailable(const void* audioSamples,
+                                  const size_t nSamples,
+                                  const size_t nBytesPerSample,
+                                  const size_t nChannels,
+                                  const uint32_t sampleRate,
+                                  const uint32_t totalDelay,
+                                  const int32_t clockSkew,
+                                  const uint32_t currentMicLevel,
+                                  const bool keyPressed,
+                                  uint32_t& newMicLevel) override {
+    rec_count_++;
+    if (rec_count_ % 100 == 0) {
+      if (nChannels == 1) {
+        // mono
+        TEST_LOG("-");
+      } else if ((nChannels == 2) && (nBytesPerSample == 2)) {
+        // stereo but only using one channel
+        TEST_LOG("-|");
+      } else {
+        // stereo
+        TEST_LOG("--");
+      }
+    }
+    return 0;
+  }
+
+  int32_t NeedMorePlayData(const size_t nSamples,
+                           const size_t nBytesPerSample,
+                           const size_t nChannels,
+                           const uint32_t sampleRate,
+                           void* audioSamples,
+                           size_t& nSamplesOut,
+                           int64_t* elapsed_time_ms,
+                           int64_t* ntp_time_ms) override {
+    play_count_++;
+    if (play_count_ % 100 == 0) {
+      if (nChannels == 1) {
+        TEST_LOG("+");
+      } else {
+        TEST_LOG("++");
+      }
+    }
+    nSamplesOut = 480;
+    return 0;
+  }
+
+  void PushCaptureData(int voe_channel,
+                       const void* audio_data,
+                       int bits_per_sample,
+                       int sample_rate,
+                       size_t number_of_channels,
+                       size_t number_of_frames) override {}
+
+  void PullRenderData(int bits_per_sample,
+                      int sample_rate,
+                      size_t number_of_channels,
+                      size_t number_of_frames,
+                      void* audio_data,
+                      int64_t* elapsed_time_ms,
+                      int64_t* ntp_time_ms) override {}
+
+ private:
+  uint32_t rec_count_;
+  uint32_t play_count_;
+};
+
+class AudioDeviceAPITest: public testing::Test {
+ protected:
+  AudioDeviceAPITest() {}
+
+  ~AudioDeviceAPITest() override {}
+
+  static void SetUpTestCase() {
+    process_thread_ = ProcessThread::Create("ProcessThread");
+    process_thread_->Start();
+
+    // Windows:
+    //      if (WEBRTC_WINDOWS_CORE_AUDIO_BUILD)
+    //          user can select only the default (Core)
+    const int32_t kId = 444;
+
+#if defined(WEBRTC_WINDOWS_CORE_AUDIO_BUILD)
+    TEST_LOG("WEBRTC_WINDOWS_CORE_AUDIO_BUILD is defined!\n\n");
+    // create default implementation (=Core Audio) instance
+    EXPECT_TRUE((audio_device_ = AudioDeviceModule::Create(
+                kId, AudioDeviceModule::kPlatformDefaultAudio)) != NULL);
+    EXPECT_EQ(0, audio_device_.release()->Release());
+    // explicitly specify usage of Core Audio (same as default)
+    EXPECT_TRUE((audio_device_ = AudioDeviceModule::Create(
+                kId, AudioDeviceModule::kWindowsCoreAudio)) != NULL);
+#endif
+
+#if defined(ANDROID)
+    // Fails tests
+    EXPECT_TRUE((audio_device_ = AudioDeviceModule::Create(
+                kId, AudioDeviceModule::kWindowsCoreAudio)) == NULL);
+    EXPECT_TRUE((audio_device_ = AudioDeviceModule::Create(
+                kId, AudioDeviceModule::kLinuxAlsaAudio)) == NULL);
+    EXPECT_TRUE((audio_device_ = AudioDeviceModule::Create(
+                kId, AudioDeviceModule::kLinuxPulseAudio)) == NULL);
+    // Create default implementation instance
+    EXPECT_TRUE((audio_device_ = AudioDeviceModule::Create(
+                kId, AudioDeviceModule::kPlatformDefaultAudio)) != NULL);
+#elif defined(WEBRTC_LINUX)
+    EXPECT_TRUE((audio_device_ = AudioDeviceModule::Create(
+                kId, AudioDeviceModule::kWindowsCoreAudio)) == NULL);
+    // create default implementation instance
+    EXPECT_TRUE((audio_device_ = AudioDeviceModule::Create(
+                kId, AudioDeviceModule::kPlatformDefaultAudio)) != NULL);
+    EXPECT_EQ(0, audio_device_->Terminate());
+    EXPECT_EQ(0, audio_device_.release()->Release());
+    // explicitly specify usage of Pulse Audio (same as default)
+    EXPECT_TRUE((audio_device_ = AudioDeviceModule::Create(
+                kId, AudioDeviceModule::kLinuxPulseAudio)) != NULL);
+#endif
+
+#if defined(WEBRTC_MAC)
+    // Fails tests
+    EXPECT_TRUE((audio_device_ = AudioDeviceModule::Create(
+                kId, AudioDeviceModule::kWindowsCoreAudio)) == NULL);
+    EXPECT_TRUE((audio_device_ = AudioDeviceModule::Create(
+                kId, AudioDeviceModule::kLinuxAlsaAudio)) == NULL);
+    EXPECT_TRUE((audio_device_ = AudioDeviceModule::Create(
+                kId, AudioDeviceModule::kLinuxPulseAudio)) == NULL);
+    // Create default implementation instance
+    EXPECT_TRUE((audio_device_ = AudioDeviceModule::Create(
+                kId, AudioDeviceModule::kPlatformDefaultAudio)) != NULL);
+#endif
+
+    if (audio_device_ == NULL) {
+      FAIL() << "Failed creating audio device object!";
+    }
+
+    process_thread_->RegisterModule(audio_device_);
+
+    AudioDeviceModule::AudioLayer audio_layer =
+        AudioDeviceModule::kPlatformDefaultAudio;
+    EXPECT_EQ(0, audio_device_->ActiveAudioLayer(&audio_layer));
+    if (audio_layer == AudioDeviceModule::kLinuxAlsaAudio) {
+      linux_alsa_ = true;
+    }
+  }
+
+  static void TearDownTestCase() {
+    if (process_thread_) {
+      process_thread_->DeRegisterModule(audio_device_);
+      process_thread_->Stop();
+      process_thread_.reset();
+    }
+    if (event_observer_) {
+      delete event_observer_;
+      event_observer_ = NULL;
+    }
+    if (audio_transport_) {
+      delete audio_transport_;
+      audio_transport_ = NULL;
+    }
+    if (audio_device_)
+      EXPECT_EQ(0, audio_device_.release()->Release());
+    PRINT_TEST_RESULTS;
+  }
+
+  void SetUp() override {
+    if (linux_alsa_) {
+      FAIL() << "API Test is not available on ALSA on Linux!";
+    }
+    EXPECT_EQ(0, audio_device_->Init());
+    EXPECT_TRUE(audio_device_->Initialized());
+  }
+
+  void TearDown() override { EXPECT_EQ(0, audio_device_->Terminate()); }
+
+  void CheckVolume(uint32_t expected, uint32_t actual) {
+    // Mac and Windows have lower resolution on the volume settings.
+#if defined(WEBRTC_MAC) || defined(_WIN32)
+    int diff = abs(static_cast<int>(expected - actual));
+    EXPECT_LE(diff, 5);
+#else
+    EXPECT_TRUE((actual == expected) || (actual == expected-1));
+#endif
+  }
+
+  void CheckInitialPlayoutStates() {
+    EXPECT_FALSE(audio_device_->PlayoutIsInitialized());
+    EXPECT_FALSE(audio_device_->Playing());
+    EXPECT_FALSE(audio_device_->SpeakerIsInitialized());
+  }
+
+  void CheckInitialRecordingStates() {
+    EXPECT_FALSE(audio_device_->RecordingIsInitialized());
+    EXPECT_FALSE(audio_device_->Recording());
+    EXPECT_FALSE(audio_device_->MicrophoneIsInitialized());
+  }
+
+  // TODO(henrika): Get rid of globals.
+  static bool linux_alsa_;
+  static std::unique_ptr<ProcessThread> process_thread_;
+  static rtc::scoped_refptr<AudioDeviceModule> audio_device_;
+  static AudioTransportAPI* audio_transport_;
+  static AudioEventObserverAPI* event_observer_;
+};
+
+// Must be initialized like this to handle static SetUpTestCase() above.
+bool AudioDeviceAPITest::linux_alsa_ = false;
+std::unique_ptr<ProcessThread> AudioDeviceAPITest::process_thread_;
+rtc::scoped_refptr<AudioDeviceModule> AudioDeviceAPITest::audio_device_;
+AudioTransportAPI* AudioDeviceAPITest::audio_transport_ = NULL;
+AudioEventObserverAPI* AudioDeviceAPITest::event_observer_ = NULL;
+
+TEST_F(AudioDeviceAPITest, RegisterEventObserver) {
+  event_observer_ = new AudioEventObserverAPI(audio_device_);
+  EXPECT_EQ(0, audio_device_->RegisterEventObserver(NULL));
+  EXPECT_EQ(0, audio_device_->RegisterEventObserver(event_observer_));
+  EXPECT_EQ(0, audio_device_->RegisterEventObserver(NULL));
+}
+
+TEST_F(AudioDeviceAPITest, RegisterAudioCallback) {
+  audio_transport_ = new AudioTransportAPI(audio_device_);
+  EXPECT_EQ(0, audio_device_->RegisterAudioCallback(NULL));
+  EXPECT_EQ(0, audio_device_->RegisterAudioCallback(audio_transport_));
+  EXPECT_EQ(0, audio_device_->RegisterAudioCallback(NULL));
+}
+
+TEST_F(AudioDeviceAPITest, Init) {
+  EXPECT_TRUE(audio_device_->Initialized());
+  EXPECT_EQ(0, audio_device_->Init());
+  EXPECT_TRUE(audio_device_->Initialized());
+  EXPECT_EQ(0, audio_device_->Terminate());
+  EXPECT_FALSE(audio_device_->Initialized());
+  EXPECT_EQ(0, audio_device_->Init());
+  EXPECT_TRUE(audio_device_->Initialized());
+  EXPECT_EQ(0, audio_device_->Terminate());
+  EXPECT_FALSE(audio_device_->Initialized());
+}
+
+TEST_F(AudioDeviceAPITest, Terminate) {
+  EXPECT_TRUE(audio_device_->Initialized());
+  EXPECT_EQ(0, audio_device_->Terminate());
+  EXPECT_FALSE(audio_device_->Initialized());
+  EXPECT_EQ(0, audio_device_->Terminate());
+  EXPECT_FALSE(audio_device_->Initialized());
+  EXPECT_EQ(0, audio_device_->Init());
+  EXPECT_TRUE(audio_device_->Initialized());
+  EXPECT_EQ(0, audio_device_->Terminate());
+  EXPECT_FALSE(audio_device_->Initialized());
+}
+
+TEST_F(AudioDeviceAPITest, PlayoutDevices) {
+  EXPECT_GT(audio_device_->PlayoutDevices(), 0);
+  EXPECT_GT(audio_device_->PlayoutDevices(), 0);
+}
+
+TEST_F(AudioDeviceAPITest, RecordingDevices) {
+  EXPECT_GT(audio_device_->RecordingDevices(), 0);
+  EXPECT_GT(audio_device_->RecordingDevices(), 0);
+}
+
+// TODO(henrika): uncomment when you have decided what to do with issue 3675.
+#if 0
+TEST_F(AudioDeviceAPITest, PlayoutDeviceName) {
+  char name[kAdmMaxDeviceNameSize];
+  char guid[kAdmMaxGuidSize];
+  int16_t no_devices = audio_device_->PlayoutDevices();
+
+  // fail tests
+  EXPECT_EQ(-1, audio_device_->PlayoutDeviceName(-2, name, guid));
+  EXPECT_EQ(-1, audio_device_->PlayoutDeviceName(no_devices, name, guid));
+  EXPECT_EQ(-1, audio_device_->PlayoutDeviceName(0, NULL, guid));
+
+  // bulk tests
+  EXPECT_EQ(0, audio_device_->PlayoutDeviceName(0, name, NULL));
+#ifdef _WIN32
+  // shall be mapped to 0.
+  EXPECT_EQ(0, audio_device_->PlayoutDeviceName(-1, name, NULL));
+#else
+  EXPECT_EQ(-1, audio_device_->PlayoutDeviceName(-1, name, NULL));
+#endif
+  for (int i = 0; i < no_devices; i++) {
+    EXPECT_EQ(0, audio_device_->PlayoutDeviceName(i, name, guid));
+    EXPECT_EQ(0, audio_device_->PlayoutDeviceName(i, name, NULL));
+  }
+}
+
+TEST_F(AudioDeviceAPITest, RecordingDeviceName) {
+  char name[kAdmMaxDeviceNameSize];
+  char guid[kAdmMaxGuidSize];
+  int16_t no_devices = audio_device_->RecordingDevices();
+
+  // fail tests
+  EXPECT_EQ(-1, audio_device_->RecordingDeviceName(-2, name, guid));
+  EXPECT_EQ(-1, audio_device_->RecordingDeviceName(no_devices, name, guid));
+  EXPECT_EQ(-1, audio_device_->RecordingDeviceName(0, NULL, guid));
+
+  // bulk tests
+  EXPECT_EQ(0, audio_device_->RecordingDeviceName(0, name, NULL));
+#ifdef _WIN32
+  // shall me mapped to 0
+  EXPECT_EQ(0, audio_device_->RecordingDeviceName(-1, name, NULL));
+#else
+  EXPECT_EQ(-1, audio_device_->RecordingDeviceName(-1, name, NULL));
+#endif
+  for (int i = 0; i < no_devices; i++) {
+    EXPECT_EQ(0, audio_device_->RecordingDeviceName(i, name, guid));
+    EXPECT_EQ(0, audio_device_->RecordingDeviceName(i, name, NULL));
+  }
+}
+
+TEST_F(AudioDeviceAPITest, SetPlayoutDevice) {
+  int16_t no_devices = audio_device_->PlayoutDevices();
+
+  // fail tests
+  EXPECT_EQ(-1, audio_device_->SetPlayoutDevice(-1));
+  EXPECT_EQ(-1, audio_device_->SetPlayoutDevice(no_devices));
+
+  // bulk tests
+#ifdef _WIN32
+  EXPECT_EQ(0, audio_device_->SetPlayoutDevice(
+      AudioDeviceModule::kDefaultCommunicationDevice));
+  EXPECT_EQ(0, audio_device_->SetPlayoutDevice(
+      AudioDeviceModule::kDefaultDevice));
+#else
+  EXPECT_EQ(-1, audio_device_->SetPlayoutDevice(
+      AudioDeviceModule::kDefaultCommunicationDevice));
+  EXPECT_EQ(-1, audio_device_->SetPlayoutDevice(
+      AudioDeviceModule::kDefaultDevice));
+#endif
+  for (int i = 0; i < no_devices; i++) {
+    EXPECT_EQ(0, audio_device_->SetPlayoutDevice(i));
+  }
+}
+
+TEST_F(AudioDeviceAPITest, SetRecordingDevice) {
+  EXPECT_EQ(0, audio_device_->Init());
+  int16_t no_devices = audio_device_->RecordingDevices();
+
+  // fail tests
+  EXPECT_EQ(-1, audio_device_->SetRecordingDevice(-1));
+  EXPECT_EQ(-1, audio_device_->SetRecordingDevice(no_devices));
+
+  // bulk tests
+#ifdef _WIN32
+  EXPECT_TRUE(audio_device_->SetRecordingDevice(
+          AudioDeviceModule::kDefaultCommunicationDevice) == 0);
+  EXPECT_EQ(0, audio_device_->SetRecordingDevice(
+      AudioDeviceModule::kDefaultDevice));
+#else
+  EXPECT_TRUE(audio_device_->SetRecordingDevice(
+      AudioDeviceModule::kDefaultCommunicationDevice) == -1);
+  EXPECT_TRUE(audio_device_->SetRecordingDevice(
+      AudioDeviceModule::kDefaultDevice) == -1);
+#endif
+  for (int i = 0; i < no_devices; i++) {
+    EXPECT_EQ(0, audio_device_->SetRecordingDevice(i));
+  }
+}
+#endif  // 0
+
+TEST_F(AudioDeviceAPITest, PlayoutIsAvailable) {
+  bool available;
+#if defined(WEBRTC_WINDOWS_CORE_AUDIO_BUILD)
+  EXPECT_TRUE(audio_device_->SetPlayoutDevice(
+          AudioDeviceModule::kDefaultCommunicationDevice) == 0);
+  EXPECT_EQ(0, audio_device_->PlayoutIsAvailable(&available));
+  // Availability check should not initialize.
+  EXPECT_FALSE(audio_device_->PlayoutIsInitialized());
+
+  EXPECT_EQ(0,
+            audio_device_->SetPlayoutDevice(AudioDeviceModule::kDefaultDevice));
+  EXPECT_EQ(0, audio_device_->PlayoutIsAvailable(&available));
+  EXPECT_FALSE(audio_device_->PlayoutIsInitialized());
+#endif
+
+  int16_t no_devices = audio_device_->PlayoutDevices();
+  for (int i = 0; i < no_devices; i++) {
+    EXPECT_EQ(0, audio_device_->SetPlayoutDevice(i));
+    EXPECT_EQ(0, audio_device_->PlayoutIsAvailable(&available));
+    EXPECT_FALSE(audio_device_->PlayoutIsInitialized());
+  }
+}
+
+TEST_F(AudioDeviceAPITest, RecordingIsAvailable) {
+  bool available;
+#if defined(WEBRTC_WINDOWS_CORE_AUDIO_BUILD)
+  EXPECT_EQ(0, audio_device_->SetRecordingDevice(
+      AudioDeviceModule::kDefaultCommunicationDevice));
+  EXPECT_EQ(0, audio_device_->RecordingIsAvailable(&available));
+  EXPECT_FALSE(audio_device_->RecordingIsInitialized());
+
+  EXPECT_EQ(0, audio_device_->SetRecordingDevice(
+      AudioDeviceModule::kDefaultDevice));
+  EXPECT_EQ(0, audio_device_->RecordingIsAvailable(&available));
+  EXPECT_FALSE(audio_device_->RecordingIsInitialized());
+#endif
+
+  int16_t no_devices = audio_device_->RecordingDevices();
+  for (int i = 0; i < no_devices; i++) {
+    EXPECT_EQ(0, audio_device_->SetRecordingDevice(i));
+    EXPECT_EQ(0, audio_device_->RecordingIsAvailable(&available));
+    EXPECT_FALSE(audio_device_->RecordingIsInitialized());
+  }
+}
+
+TEST_F(AudioDeviceAPITest, InitPlayout) {
+  // check initial state
+  EXPECT_FALSE(audio_device_->PlayoutIsInitialized());
+
+  // ensure that device must be set before we can initialize
+  EXPECT_EQ(-1, audio_device_->InitPlayout());
+  EXPECT_EQ(0, audio_device_->SetPlayoutDevice(MACRO_DEFAULT_DEVICE));
+  EXPECT_EQ(0, audio_device_->InitPlayout());
+  EXPECT_TRUE(audio_device_->PlayoutIsInitialized());
+
+  // bulk tests
+  bool available;
+  EXPECT_EQ(0, audio_device_->PlayoutIsAvailable(&available));
+  if (available) {
+    EXPECT_EQ(0, audio_device_->InitPlayout());
+    EXPECT_TRUE(audio_device_->PlayoutIsInitialized());
+    EXPECT_EQ(0, audio_device_->InitPlayout());
+    EXPECT_EQ(-1, audio_device_->SetPlayoutDevice(
+        MACRO_DEFAULT_COMMUNICATION_DEVICE));
+    EXPECT_EQ(0, audio_device_->StopPlayout());
+    EXPECT_FALSE(audio_device_->PlayoutIsInitialized());
+  }
+
+  EXPECT_EQ(0, audio_device_->SetPlayoutDevice(
+      MACRO_DEFAULT_COMMUNICATION_DEVICE));
+  EXPECT_EQ(0, audio_device_->PlayoutIsAvailable(&available));
+  if (available) {
+    EXPECT_EQ(0, audio_device_->InitPlayout());
+    // Sleep is needed for e.g. iPhone since we after stopping then starting may
+    // have a hangover time of a couple of ms before initialized.
+    SleepMs(50);
+    EXPECT_TRUE(audio_device_->PlayoutIsInitialized());
+  }
+
+  int16_t no_devices = audio_device_->PlayoutDevices();
+  for (int i = 0; i < no_devices; i++) {
+    EXPECT_EQ(0, audio_device_->PlayoutIsAvailable(&available));
+    if (available) {
+      EXPECT_EQ(0, audio_device_->StopPlayout());
+      EXPECT_FALSE(audio_device_->PlayoutIsInitialized());
+      EXPECT_EQ(0, audio_device_->SetPlayoutDevice(i));
+      EXPECT_EQ(0, audio_device_->PlayoutIsAvailable(&available));
+      if (available) {
+        EXPECT_EQ(0, audio_device_->InitPlayout());
+        EXPECT_TRUE(audio_device_->PlayoutIsInitialized());
+      }
+    }
+  }
+  EXPECT_EQ(0, audio_device_->StopPlayout());
+}
+
+TEST_F(AudioDeviceAPITest, InitRecording) {
+  // check initial state
+  EXPECT_FALSE(audio_device_->RecordingIsInitialized());
+
+  // ensure that device must be set before we can initialize
+  EXPECT_EQ(-1, audio_device_->InitRecording());
+  EXPECT_EQ(0, audio_device_->SetRecordingDevice(MACRO_DEFAULT_DEVICE));
+  EXPECT_EQ(0, audio_device_->InitRecording());
+  EXPECT_TRUE(audio_device_->RecordingIsInitialized());
+
+  // bulk tests
+  bool available;
+  EXPECT_EQ(0, audio_device_->RecordingIsAvailable(&available));
+  if (available) {
+    EXPECT_EQ(0, audio_device_->InitRecording());
+    EXPECT_TRUE(audio_device_->RecordingIsInitialized());
+    EXPECT_EQ(0, audio_device_->InitRecording());
+    EXPECT_EQ(-1,
+        audio_device_->SetRecordingDevice(MACRO_DEFAULT_COMMUNICATION_DEVICE));
+    EXPECT_EQ(0, audio_device_->StopRecording());
+    EXPECT_FALSE(audio_device_->RecordingIsInitialized());
+  }
+
+  EXPECT_EQ(0,
+      audio_device_->SetRecordingDevice(MACRO_DEFAULT_COMMUNICATION_DEVICE));
+  EXPECT_EQ(0, audio_device_->RecordingIsAvailable(&available));
+  if (available) {
+    EXPECT_EQ(0, audio_device_->InitRecording());
+    SleepMs(50);
+    EXPECT_TRUE(audio_device_->RecordingIsInitialized());
+  }
+
+  int16_t no_devices = audio_device_->RecordingDevices();
+  for (int i = 0; i < no_devices; i++) {
+    EXPECT_EQ(0, audio_device_->RecordingIsAvailable(&available));
+    if (available) {
+      EXPECT_EQ(0, audio_device_->StopRecording());
+      EXPECT_FALSE(audio_device_->RecordingIsInitialized());
+      EXPECT_EQ(0, audio_device_->SetRecordingDevice(i));
+      EXPECT_EQ(0, audio_device_->RecordingIsAvailable(&available));
+      if (available) {
+        EXPECT_EQ(0, audio_device_->InitRecording());
+        EXPECT_TRUE(audio_device_->RecordingIsInitialized());
+      }
+    }
+  }
+  EXPECT_EQ(0, audio_device_->StopRecording());
+}
+
+TEST_F(AudioDeviceAPITest, StartAndStopPlayout) {
+  bool available;
+  EXPECT_EQ(0, audio_device_->RegisterAudioCallback(NULL));
+
+  CheckInitialPlayoutStates();
+
+  EXPECT_EQ(-1, audio_device_->StartPlayout());
+  EXPECT_EQ(0, audio_device_->StopPlayout());
+
+#if defined(WEBRTC_WINDOWS_CORE_AUDIO_BUILD)
+  // kDefaultCommunicationDevice
+  EXPECT_TRUE(audio_device_->SetPlayoutDevice(
+          AudioDeviceModule::kDefaultCommunicationDevice) == 0);
+  EXPECT_EQ(0, audio_device_->PlayoutIsAvailable(&available));
+  if (available)
+  {
+    EXPECT_FALSE(audio_device_->PlayoutIsInitialized());
+    EXPECT_EQ(0, audio_device_->InitPlayout());
+    EXPECT_EQ(0, audio_device_->StartPlayout());
+    EXPECT_TRUE(audio_device_->Playing());
+    EXPECT_EQ(-1, audio_device_->RegisterAudioCallback(audio_transport_));
+    EXPECT_EQ(0, audio_device_->StopPlayout());
+    EXPECT_FALSE(audio_device_->Playing());
+    EXPECT_EQ(0, audio_device_->RegisterAudioCallback(NULL));
+  }
+#endif
+
+  // repeat test but for kDefaultDevice
+  EXPECT_EQ(0, audio_device_->SetPlayoutDevice(MACRO_DEFAULT_DEVICE));
+  EXPECT_EQ(0, audio_device_->PlayoutIsAvailable(&available));
+  if (available) {
+    EXPECT_FALSE(audio_device_->PlayoutIsInitialized());
+    EXPECT_EQ(0, audio_device_->InitPlayout());
+    EXPECT_EQ(0, audio_device_->StartPlayout());
+    EXPECT_TRUE(audio_device_->Playing());
+    EXPECT_EQ(-1, audio_device_->RegisterAudioCallback(audio_transport_));
+    EXPECT_EQ(0, audio_device_->StopPlayout());
+    EXPECT_FALSE(audio_device_->Playing());
+    EXPECT_EQ(0, audio_device_->RegisterAudioCallback(NULL));
+  }
+
+  // repeat test for all devices
+  int16_t no_devices = audio_device_->PlayoutDevices();
+  for (int i = 0; i < no_devices; i++) {
+    EXPECT_EQ(0, audio_device_->SetPlayoutDevice(i));
+    EXPECT_EQ(0, audio_device_->PlayoutIsAvailable(&available));
+    if (available) {
+      EXPECT_FALSE(audio_device_->PlayoutIsInitialized());
+      EXPECT_EQ(0, audio_device_->InitPlayout());
+      EXPECT_EQ(0, audio_device_->StartPlayout());
+      EXPECT_TRUE(audio_device_->Playing());
+      EXPECT_EQ(-1, audio_device_->RegisterAudioCallback(audio_transport_));
+      EXPECT_EQ(0, audio_device_->StopPlayout());
+      EXPECT_FALSE(audio_device_->Playing());
+      EXPECT_EQ(0, audio_device_->RegisterAudioCallback(NULL));
+    }
+  }
+}
+
+TEST_F(AudioDeviceAPITest, StartAndStopRecording) {
+  bool available;
+  EXPECT_EQ(0, audio_device_->RegisterAudioCallback(NULL));
+
+  CheckInitialRecordingStates();
+
+  EXPECT_EQ(-1, audio_device_->StartRecording());
+  EXPECT_EQ(0, audio_device_->StopRecording());
+
+#if defined(WEBRTC_WINDOWS_CORE_AUDIO_BUILD)
+  // kDefaultCommunicationDevice
+  EXPECT_TRUE(audio_device_->SetRecordingDevice(
+          AudioDeviceModule::kDefaultCommunicationDevice) == 0);
+  EXPECT_EQ(0, audio_device_->RecordingIsAvailable(&available));
+  if (available)
+  {
+    EXPECT_FALSE(audio_device_->RecordingIsInitialized());
+    EXPECT_EQ(0, audio_device_->InitRecording());
+    EXPECT_EQ(0, audio_device_->StartRecording());
+    EXPECT_TRUE(audio_device_->Recording());
+    EXPECT_EQ(-1, audio_device_->RegisterAudioCallback(audio_transport_));
+    EXPECT_EQ(0, audio_device_->StopRecording());
+    EXPECT_FALSE(audio_device_->Recording());
+    EXPECT_EQ(0, audio_device_->RegisterAudioCallback(NULL));
+  }
+#endif
+
+  // repeat test but for kDefaultDevice
+  EXPECT_EQ(0, audio_device_->SetRecordingDevice(MACRO_DEFAULT_DEVICE));
+  EXPECT_EQ(0, audio_device_->RecordingIsAvailable(&available));
+  if (available) {
+    EXPECT_FALSE(audio_device_->RecordingIsInitialized());
+    EXPECT_EQ(0, audio_device_->InitRecording());
+    EXPECT_EQ(0, audio_device_->StartRecording());
+    EXPECT_TRUE(audio_device_->Recording());
+    EXPECT_EQ(-1, audio_device_->RegisterAudioCallback(audio_transport_));
+    EXPECT_EQ(0, audio_device_->StopRecording());
+    EXPECT_FALSE(audio_device_->Recording());
+    EXPECT_EQ(0, audio_device_->RegisterAudioCallback(NULL));
+  }
+
+  // repeat test for all devices
+  int16_t no_devices = audio_device_->RecordingDevices();
+  for (int i = 0; i < no_devices; i++) {
+    EXPECT_EQ(0, audio_device_->SetRecordingDevice(i));
+    EXPECT_EQ(0, audio_device_->RecordingIsAvailable(&available));
+    if (available) {
+      EXPECT_FALSE(audio_device_->RecordingIsInitialized());
+      EXPECT_EQ(0, audio_device_->InitRecording());
+      EXPECT_EQ(0, audio_device_->StartRecording());
+      EXPECT_TRUE(audio_device_->Recording());
+      EXPECT_EQ(-1, audio_device_->RegisterAudioCallback(audio_transport_));
+      EXPECT_EQ(0, audio_device_->StopRecording());
+      EXPECT_FALSE(audio_device_->Recording());
+      EXPECT_EQ(0, audio_device_->RegisterAudioCallback(NULL));
+    }
+  }
+}
+
+
+TEST_F(AudioDeviceAPITest, InitSpeaker) {
+  // NOTE: By calling Terminate (in TearDown) followed by Init (in SetUp) we
+  // ensure that any existing output mixer handle is set to NULL.
+  // The mixer handle is closed and reopened again for each call to
+  // SetPlayoutDevice.
+  CheckInitialPlayoutStates();
+
+  // kDefaultCommunicationDevice
+  EXPECT_EQ(0, audio_device_->SetPlayoutDevice(
+      MACRO_DEFAULT_COMMUNICATION_DEVICE));
+  EXPECT_EQ(0, audio_device_->InitSpeaker());
+
+  // fail tests
+  bool available;
+  EXPECT_EQ(0, audio_device_->PlayoutIsAvailable(&available));
+  if (available) {
+    EXPECT_EQ(0, audio_device_->InitPlayout());
+    EXPECT_EQ(0, audio_device_->StartPlayout());
+    EXPECT_EQ(-1, audio_device_->InitSpeaker());
+    EXPECT_EQ(0, audio_device_->StopPlayout());
+  }
+
+  // kDefaultDevice
+  EXPECT_EQ(0, audio_device_->SetPlayoutDevice(MACRO_DEFAULT_DEVICE));
+  EXPECT_EQ(0, audio_device_->InitSpeaker());
+
+  // repeat test for all devices
+  int16_t no_devices = audio_device_->PlayoutDevices();
+  for (int i = 0; i < no_devices; i++) {
+    EXPECT_EQ(0, audio_device_->SetPlayoutDevice(i));
+    EXPECT_EQ(0, audio_device_->InitSpeaker());
+  }
+}
+
+TEST_F(AudioDeviceAPITest, InitMicrophone) {
+  // NOTE: By calling Terminate (in TearDown) followed by Init (in SetUp) we
+  // ensure that any existing output mixer handle is set to NULL.
+  // The mixer handle is closed and reopened again for each call to
+  // SetRecordingDevice.
+  CheckInitialRecordingStates();
+
+  // kDefaultCommunicationDevice
+  EXPECT_EQ(0,
+      audio_device_->SetRecordingDevice(MACRO_DEFAULT_COMMUNICATION_DEVICE));
+  EXPECT_EQ(0, audio_device_->InitMicrophone());
+
+  // fail tests
+  bool available;
+  EXPECT_EQ(0, audio_device_->RecordingIsAvailable(&available));
+  if (available) {
+    EXPECT_EQ(0, audio_device_->InitRecording());
+    EXPECT_EQ(0, audio_device_->StartRecording());
+    EXPECT_EQ(-1, audio_device_->InitMicrophone());
+    EXPECT_EQ(0, audio_device_->StopRecording());
+  }
+
+  // kDefaultDevice
+  EXPECT_EQ(0, audio_device_->SetRecordingDevice(MACRO_DEFAULT_DEVICE));
+  EXPECT_EQ(0, audio_device_->InitMicrophone());
+
+  // repeat test for all devices
+  int16_t no_devices = audio_device_->RecordingDevices();
+  for (int i = 0; i < no_devices; i++) {
+    EXPECT_EQ(0, audio_device_->SetRecordingDevice(i));
+    EXPECT_EQ(0, audio_device_->InitMicrophone());
+  }
+}
+
+TEST_F(AudioDeviceAPITest, SpeakerVolumeIsAvailable) {
+  CheckInitialPlayoutStates();
+  bool available;
+
+#if defined(WEBRTC_WINDOWS_CORE_AUDIO_BUILD)
+  // check the kDefaultCommunicationDevice
+  EXPECT_TRUE(audio_device_->SetPlayoutDevice(
+          AudioDeviceModule::kDefaultCommunicationDevice) == 0);
+  EXPECT_EQ(0, audio_device_->SpeakerVolumeIsAvailable(&available));
+  // check for availability should not lead to initialization
+  EXPECT_FALSE(audio_device_->SpeakerIsInitialized());
+#endif
+
+  // check the kDefaultDevice
+  EXPECT_EQ(0, audio_device_->SetPlayoutDevice(MACRO_DEFAULT_DEVICE));
+  EXPECT_EQ(0, audio_device_->SpeakerVolumeIsAvailable(&available));
+  EXPECT_FALSE(audio_device_->SpeakerIsInitialized());
+
+  // check all availiable devices
+  int16_t no_devices = audio_device_->PlayoutDevices();
+  for (int i = 0; i < no_devices; i++) {
+    EXPECT_EQ(0, audio_device_->SetPlayoutDevice(i));
+    EXPECT_EQ(0, audio_device_->SpeakerVolumeIsAvailable(&available));
+    EXPECT_FALSE(audio_device_->SpeakerIsInitialized());
+  }
+}
+
+// Tests the following methods:
+// SetSpeakerVolume
+// SpeakerVolume
+// MaxSpeakerVolume
+// MinSpeakerVolume
+// NOTE: Disabled on mac due to issue 257.
+#ifndef WEBRTC_MAC
+TEST_F(AudioDeviceAPITest, SpeakerVolumeTests) {
+  uint32_t vol(0);
+  uint32_t volume(0);
+  uint32_t maxVolume(0);
+  uint32_t minVolume(0);
+  uint16_t stepSize(0);
+  bool available;
+  CheckInitialPlayoutStates();
+
+  // fail tests
+  EXPECT_EQ(-1, audio_device_->SetSpeakerVolume(0));
+  // speaker must be initialized first
+  EXPECT_EQ(-1, audio_device_->SpeakerVolume(&volume));
+  EXPECT_EQ(-1, audio_device_->MaxSpeakerVolume(&maxVolume));
+  EXPECT_EQ(-1, audio_device_->MinSpeakerVolume(&minVolume));
+  EXPECT_EQ(-1, audio_device_->SpeakerVolumeStepSize(&stepSize));
+
+#if defined(WEBRTC_WINDOWS_CORE_AUDIO_BUILD)
+  // use kDefaultCommunicationDevice and modify/retrieve the volume
+  EXPECT_TRUE(audio_device_->SetPlayoutDevice(
+          AudioDeviceModule::kDefaultCommunicationDevice) == 0);
+  EXPECT_EQ(0, audio_device_->SpeakerVolumeIsAvailable(&available));
+  if (available) {
+    EXPECT_EQ(0, audio_device_->InitSpeaker());
+    EXPECT_EQ(0, audio_device_->MaxSpeakerVolume(&maxVolume));
+    EXPECT_EQ(0, audio_device_->MinSpeakerVolume(&minVolume));
+    EXPECT_EQ(0, audio_device_->SpeakerVolumeStepSize(&stepSize));
+    for (vol = minVolume; vol < (unsigned int)maxVolume; vol += 20*stepSize) {
+      EXPECT_EQ(0, audio_device_->SetSpeakerVolume(vol));
+      EXPECT_EQ(0, audio_device_->SpeakerVolume(&volume));
+      CheckVolume(volume, vol);
+    }
+  }
+#endif
+
+  // use kDefaultDevice and modify/retrieve the volume
+  EXPECT_EQ(0, audio_device_->SetPlayoutDevice(MACRO_DEFAULT_DEVICE));
+  EXPECT_EQ(0, audio_device_->SpeakerVolumeIsAvailable(&available));
+  if (available) {
+    EXPECT_EQ(0, audio_device_->InitSpeaker());
+    EXPECT_EQ(0, audio_device_->MaxSpeakerVolume(&maxVolume));
+    EXPECT_EQ(0, audio_device_->MinSpeakerVolume(&minVolume));
+    EXPECT_EQ(0, audio_device_->SpeakerVolumeStepSize(&stepSize));
+    uint32_t step = (maxVolume - minVolume) / 10;
+    step = (step < stepSize ? stepSize : step);
+    for (vol = minVolume; vol <= maxVolume; vol += step) {
+      EXPECT_EQ(0, audio_device_->SetSpeakerVolume(vol));
+      EXPECT_EQ(0, audio_device_->SpeakerVolume(&volume));
+      CheckVolume(volume, vol);
+    }
+  }
+
+  // use all (indexed) devices and modify/retrieve the volume
+  int16_t no_devices = audio_device_->PlayoutDevices();
+  for (int i = 0; i < no_devices; i++) {
+    EXPECT_EQ(0, audio_device_->SetPlayoutDevice(i));
+    EXPECT_EQ(0, audio_device_->SpeakerVolumeIsAvailable(&available));
+    if (available) {
+      EXPECT_EQ(0, audio_device_->InitSpeaker());
+      EXPECT_EQ(0, audio_device_->MaxSpeakerVolume(&maxVolume));
+      EXPECT_EQ(0, audio_device_->MinSpeakerVolume(&minVolume));
+      EXPECT_EQ(0, audio_device_->SpeakerVolumeStepSize(&stepSize));
+      uint32_t step = (maxVolume - minVolume) / 10;
+      step = (step < stepSize ? stepSize : step);
+      for (vol = minVolume; vol <= maxVolume; vol += step) {
+        EXPECT_EQ(0, audio_device_->SetSpeakerVolume(vol));
+        EXPECT_EQ(0, audio_device_->SpeakerVolume(&volume));
+        CheckVolume(volume, vol);
+      }
+    }
+  }
+
+  // restore reasonable level
+  EXPECT_EQ(0, audio_device_->SetPlayoutDevice(MACRO_DEFAULT_DEVICE));
+  EXPECT_EQ(0, audio_device_->SpeakerVolumeIsAvailable(&available));
+  if (available) {
+    EXPECT_EQ(0, audio_device_->InitSpeaker());
+    EXPECT_EQ(0, audio_device_->MaxSpeakerVolume(&maxVolume));
+    EXPECT_TRUE(audio_device_->SetSpeakerVolume(maxVolume < 10 ?
+        maxVolume/3 : maxVolume/10) == 0);
+  }
+}
+#endif  // !WEBRTC_MAC
+
+TEST_F(AudioDeviceAPITest, AGC) {
+  // NOTE: The AGC API only enables/disables the AGC. To ensure that it will
+  // have an effect, use it in combination with MicrophoneVolumeIsAvailable.
+  CheckInitialRecordingStates();
+  EXPECT_FALSE(audio_device_->AGC());
+
+  // set/get tests
+  EXPECT_EQ(0, audio_device_->SetAGC(true));
+  EXPECT_TRUE(audio_device_->AGC());
+  EXPECT_EQ(0, audio_device_->SetAGC(false));
+  EXPECT_FALSE(audio_device_->AGC());
+}
+
+TEST_F(AudioDeviceAPITest, MicrophoneVolumeIsAvailable) {
+  CheckInitialRecordingStates();
+  bool available;
+
+#if defined(WEBRTC_WINDOWS_CORE_AUDIO_BUILD)
+  // check the kDefaultCommunicationDevice
+  EXPECT_TRUE(audio_device_->SetRecordingDevice(
+          AudioDeviceModule::kDefaultCommunicationDevice) == 0);
+  EXPECT_EQ(0, audio_device_->MicrophoneVolumeIsAvailable(&available));
+  // check for availability should not lead to initialization
+  EXPECT_FALSE(audio_device_->MicrophoneIsInitialized());
+#endif
+
+  // check the kDefaultDevice
+  EXPECT_EQ(0, audio_device_->SetRecordingDevice(MACRO_DEFAULT_DEVICE));
+  EXPECT_EQ(0, audio_device_->MicrophoneVolumeIsAvailable(&available));
+  EXPECT_FALSE(audio_device_->MicrophoneIsInitialized());
+
+  // check all availiable devices
+  int16_t no_devices = audio_device_->RecordingDevices();
+  for (int i = 0; i < no_devices; i++) {
+    EXPECT_EQ(0, audio_device_->SetRecordingDevice(i));
+    EXPECT_EQ(0, audio_device_->MicrophoneVolumeIsAvailable(&available));
+    EXPECT_FALSE(audio_device_->MicrophoneIsInitialized());
+  }
+}
+
+// Tests the methods:
+// SetMicrophoneVolume
+// MicrophoneVolume
+// MaxMicrophoneVolume
+// MinMicrophoneVolume
+
+// Disabled on Mac and Linux,
+// see https://bugs.chromium.org/p/webrtc/issues/detail?id=5414
+#if defined(WEBRTC_MAC) || defined(WEBRTC_LINUX)
+#define MAYBE_MicrophoneVolumeTests DISABLED_MicrophoneVolumeTests
+#else
+#define MAYBE_MicrophoneVolumeTests MicrophoneVolumeTests
+#endif
+TEST_F(AudioDeviceAPITest, MAYBE_MicrophoneVolumeTests) {
+  uint32_t vol(0);
+  uint32_t volume(0);
+  uint32_t maxVolume(0);
+  uint32_t minVolume(0);
+  uint16_t stepSize(0);
+  bool available;
+  CheckInitialRecordingStates();
+
+  // fail tests
+  EXPECT_EQ(-1, audio_device_->SetMicrophoneVolume(0));
+  // must be initialized first
+  EXPECT_EQ(-1, audio_device_->MicrophoneVolume(&volume));
+  EXPECT_EQ(-1, audio_device_->MaxMicrophoneVolume(&maxVolume));
+  EXPECT_EQ(-1, audio_device_->MinMicrophoneVolume(&minVolume));
+  EXPECT_EQ(-1, audio_device_->MicrophoneVolumeStepSize(&stepSize));
+
+#if defined(WEBRTC_WINDOWS_CORE_AUDIO_BUILD)
+  // initialize kDefaultCommunicationDevice and modify/retrieve the volume
+  EXPECT_TRUE(audio_device_->SetRecordingDevice(
+          AudioDeviceModule::kDefaultCommunicationDevice) == 0);
+  EXPECT_EQ(0, audio_device_->MicrophoneVolumeIsAvailable(&available));
+  if (available)
+  {
+    EXPECT_EQ(0, audio_device_->InitMicrophone());
+    EXPECT_EQ(0, audio_device_->MaxMicrophoneVolume(&maxVolume));
+    EXPECT_EQ(0, audio_device_->MinMicrophoneVolume(&minVolume));
+    EXPECT_EQ(0, audio_device_->MicrophoneVolumeStepSize(&stepSize));
+    for (vol = minVolume; vol < (unsigned int)maxVolume; vol += 10*stepSize)
+    {
+      EXPECT_EQ(0, audio_device_->SetMicrophoneVolume(vol));
+      EXPECT_EQ(0, audio_device_->MicrophoneVolume(&volume));
+      CheckVolume(volume, vol);
+    }
+  }
+#endif
+
+  // reinitialize kDefaultDevice and modify/retrieve the volume
+  EXPECT_EQ(0, audio_device_->SetRecordingDevice(MACRO_DEFAULT_DEVICE));
+  EXPECT_EQ(0, audio_device_->MicrophoneVolumeIsAvailable(&available));
+  if (available) {
+    EXPECT_EQ(0, audio_device_->InitMicrophone());
+    EXPECT_EQ(0, audio_device_->MaxMicrophoneVolume(&maxVolume));
+    EXPECT_EQ(0, audio_device_->MinMicrophoneVolume(&minVolume));
+    EXPECT_EQ(0, audio_device_->MicrophoneVolumeStepSize(&stepSize));
+    for (vol = minVolume; vol < maxVolume; vol += 10 * stepSize) {
+      EXPECT_EQ(0, audio_device_->SetMicrophoneVolume(vol));
+      EXPECT_EQ(0, audio_device_->MicrophoneVolume(&volume));
+      CheckVolume(volume, vol);
+    }
+  }
+
+  // use all (indexed) devices and modify/retrieve the volume
+  int16_t no_devices = audio_device_->RecordingDevices();
+  for (int i = 0; i < no_devices; i++) {
+    EXPECT_EQ(0, audio_device_->SetRecordingDevice(i));
+    EXPECT_EQ(0, audio_device_->MicrophoneVolumeIsAvailable(&available));
+    if (available) {
+      EXPECT_EQ(0, audio_device_->InitMicrophone());
+      EXPECT_EQ(0, audio_device_->MaxMicrophoneVolume(&maxVolume));
+      EXPECT_EQ(0, audio_device_->MinMicrophoneVolume(&minVolume));
+      EXPECT_EQ(0, audio_device_->MicrophoneVolumeStepSize(&stepSize));
+      for (vol = minVolume; vol < maxVolume; vol += 20 * stepSize) {
+        EXPECT_EQ(0, audio_device_->SetMicrophoneVolume(vol));
+        EXPECT_EQ(0, audio_device_->MicrophoneVolume(&volume));
+        CheckVolume(volume, vol);
+      }
+    }
+  }
+
+  // restore reasonable level
+  EXPECT_EQ(0, audio_device_->SetRecordingDevice(MACRO_DEFAULT_DEVICE));
+  EXPECT_EQ(0, audio_device_->MicrophoneVolumeIsAvailable(&available));
+  if (available) {
+    EXPECT_EQ(0, audio_device_->InitMicrophone());
+    EXPECT_EQ(0, audio_device_->MaxMicrophoneVolume(&maxVolume));
+    EXPECT_EQ(0, audio_device_->SetMicrophoneVolume(maxVolume/10));
+  }
+}
+
+TEST_F(AudioDeviceAPITest, SpeakerMuteIsAvailable) {
+  bool available;
+  CheckInitialPlayoutStates();
+#if defined(WEBRTC_WINDOWS_CORE_AUDIO_BUILD)
+  // check the kDefaultCommunicationDevice
+  EXPECT_TRUE(audio_device_->SetPlayoutDevice(
+          AudioDeviceModule::kDefaultCommunicationDevice) == 0);
+  EXPECT_EQ(0, audio_device_->SpeakerMuteIsAvailable(&available));
+  // check for availability should not lead to initialization
+  EXPECT_FALSE(audio_device_->SpeakerIsInitialized());
+#endif
+
+  // check the kDefaultDevice
+  EXPECT_EQ(0, audio_device_->SetPlayoutDevice(MACRO_DEFAULT_DEVICE));
+  EXPECT_EQ(0, audio_device_->SpeakerMuteIsAvailable(&available));
+  EXPECT_FALSE(audio_device_->SpeakerIsInitialized());
+
+  // check all availiable devices
+  int16_t no_devices = audio_device_->PlayoutDevices();
+  for (int i = 0; i < no_devices; i++) {
+    EXPECT_EQ(0, audio_device_->SetPlayoutDevice(i));
+    EXPECT_EQ(0, audio_device_->SpeakerMuteIsAvailable(&available));
+    EXPECT_FALSE(audio_device_->SpeakerIsInitialized());
+  }
+}
+
+TEST_F(AudioDeviceAPITest, MicrophoneMuteIsAvailable) {
+  bool available;
+  CheckInitialRecordingStates();
+#if defined(WEBRTC_WINDOWS_CORE_AUDIO_BUILD)
+  // check the kDefaultCommunicationDevice
+  EXPECT_TRUE(audio_device_->SetRecordingDevice(
+          AudioDeviceModule::kDefaultCommunicationDevice) == 0);
+  EXPECT_EQ(0, audio_device_->MicrophoneMuteIsAvailable(&available));
+  // check for availability should not lead to initialization
+#endif
+  EXPECT_FALSE(audio_device_->MicrophoneIsInitialized());
+
+  // check the kDefaultDevice
+  EXPECT_EQ(0, audio_device_->SetRecordingDevice(MACRO_DEFAULT_DEVICE));
+  EXPECT_EQ(0, audio_device_->MicrophoneMuteIsAvailable(&available));
+  EXPECT_FALSE(audio_device_->MicrophoneIsInitialized());
+
+  // check all availiable devices
+  int16_t no_devices = audio_device_->RecordingDevices();
+  for (int i = 0; i < no_devices; i++) {
+    EXPECT_EQ(0, audio_device_->SetRecordingDevice(i));
+    EXPECT_EQ(0, audio_device_->MicrophoneMuteIsAvailable(&available));
+    EXPECT_FALSE(audio_device_->MicrophoneIsInitialized());
+  }
+}
+
+TEST_F(AudioDeviceAPITest, MicrophoneBoostIsAvailable) {
+  bool available;
+  CheckInitialRecordingStates();
+#if defined(WEBRTC_WINDOWS_CORE_AUDIO_BUILD)
+  // check the kDefaultCommunicationDevice
+  EXPECT_TRUE(audio_device_->SetRecordingDevice(
+          AudioDeviceModule::kDefaultCommunicationDevice) == 0);
+  EXPECT_EQ(0, audio_device_->MicrophoneBoostIsAvailable(&available));
+  // check for availability should not lead to initialization
+  EXPECT_FALSE(audio_device_->MicrophoneIsInitialized());
+#endif
+
+  // check the kDefaultDevice
+  EXPECT_EQ(0, audio_device_->SetRecordingDevice(MACRO_DEFAULT_DEVICE));
+  EXPECT_EQ(0, audio_device_->MicrophoneBoostIsAvailable(&available));
+  EXPECT_FALSE(audio_device_->MicrophoneIsInitialized());
+
+  // check all availiable devices
+  int16_t no_devices = audio_device_->RecordingDevices();
+  for (int i = 0; i < no_devices; i++) {
+    EXPECT_EQ(0, audio_device_->SetRecordingDevice(i));
+    EXPECT_EQ(0, audio_device_->MicrophoneBoostIsAvailable(&available));
+    EXPECT_FALSE(audio_device_->MicrophoneIsInitialized());
+  }
+}
+
+TEST_F(AudioDeviceAPITest, SpeakerMuteTests) {
+  bool available;
+  bool enabled;
+  CheckInitialPlayoutStates();
+  // fail tests
+  EXPECT_EQ(-1, audio_device_->SetSpeakerMute(true));
+  // requires initialization
+  EXPECT_EQ(-1, audio_device_->SpeakerMute(&enabled));
+
+#if defined(WEBRTC_WINDOWS_CORE_AUDIO_BUILD)
+  // initialize kDefaultCommunicationDevice and modify/retrieve the mute state
+  EXPECT_EQ(0, audio_device_->SetPlayoutDevice(
+      AudioDeviceModule::kDefaultCommunicationDevice));
+  EXPECT_EQ(0, audio_device_->SpeakerMuteIsAvailable(&available));
+  if (available)
+  {
+    EXPECT_EQ(0, audio_device_->InitSpeaker());
+    EXPECT_EQ(0, audio_device_->SetSpeakerMute(true));
+    EXPECT_EQ(0, audio_device_->SpeakerMute(&enabled));
+    EXPECT_TRUE(enabled);
+    EXPECT_EQ(0, audio_device_->SetSpeakerMute(false));
+    EXPECT_EQ(0, audio_device_->SpeakerMute(&enabled));
+    EXPECT_FALSE(enabled);
+  }
+#endif
+
+  // reinitialize kDefaultDevice and modify/retrieve the mute state
+  EXPECT_EQ(0, audio_device_->SetPlayoutDevice(MACRO_DEFAULT_DEVICE));
+  EXPECT_EQ(0, audio_device_->SpeakerMuteIsAvailable(&available));
+  if (available) {
+    EXPECT_EQ(0, audio_device_->InitSpeaker());
+    EXPECT_EQ(0, audio_device_->SetSpeakerMute(true));
+    EXPECT_EQ(0, audio_device_->SpeakerMute(&enabled));
+    EXPECT_TRUE(enabled);
+    EXPECT_EQ(0, audio_device_->SetSpeakerMute(false));
+    EXPECT_EQ(0, audio_device_->SpeakerMute(&enabled));
+    EXPECT_FALSE(enabled);
+  }
+
+  // reinitialize the default device (0) and modify/retrieve the mute state
+  EXPECT_EQ(0, audio_device_->SetPlayoutDevice(0));
+  EXPECT_EQ(0, audio_device_->SpeakerMuteIsAvailable(&available));
+  if (available) {
+    EXPECT_EQ(0, audio_device_->InitSpeaker());
+    EXPECT_EQ(0, audio_device_->SetSpeakerMute(true));
+    EXPECT_EQ(0, audio_device_->SpeakerMute(&enabled));
+    EXPECT_TRUE(enabled);
+    EXPECT_EQ(0, audio_device_->SetSpeakerMute(false));
+    EXPECT_EQ(0, audio_device_->SpeakerMute(&enabled));
+    EXPECT_FALSE(enabled);
+  }
+}
+
+TEST_F(AudioDeviceAPITest, MicrophoneMuteTests) {
+  CheckInitialRecordingStates();
+
+  // fail tests
+  EXPECT_EQ(-1, audio_device_->SetMicrophoneMute(true));
+  // requires initialization
+  bool available;
+  bool enabled;
+  EXPECT_EQ(-1, audio_device_->MicrophoneMute(&enabled));
+
+#if defined(WEBRTC_WINDOWS_CORE_AUDIO_BUILD)
+  // initialize kDefaultCommunicationDevice and modify/retrieve the mute
+  EXPECT_TRUE(audio_device_->SetRecordingDevice(
+          AudioDeviceModule::kDefaultCommunicationDevice) == 0);
+  EXPECT_EQ(0, audio_device_->MicrophoneMuteIsAvailable(&available));
+  if (available)
+  {
+    EXPECT_EQ(0, audio_device_->InitMicrophone());
+    EXPECT_EQ(0, audio_device_->SetMicrophoneMute(true));
+    EXPECT_EQ(0, audio_device_->MicrophoneMute(&enabled));
+    EXPECT_TRUE(enabled);
+    EXPECT_EQ(0, audio_device_->SetMicrophoneMute(false));
+    EXPECT_EQ(0, audio_device_->MicrophoneMute(&enabled));
+    EXPECT_FALSE(enabled);
+  }
+#endif
+
+  // reinitialize kDefaultDevice and modify/retrieve the mute
+  EXPECT_EQ(0, audio_device_->SetRecordingDevice(MACRO_DEFAULT_DEVICE));
+  EXPECT_EQ(0, audio_device_->MicrophoneMuteIsAvailable(&available));
+  if (available) {
+    EXPECT_EQ(0, audio_device_->InitMicrophone());
+    EXPECT_EQ(0, audio_device_->SetMicrophoneMute(true));
+    EXPECT_EQ(0, audio_device_->MicrophoneMute(&enabled));
+    EXPECT_TRUE(enabled);
+    EXPECT_EQ(0, audio_device_->SetMicrophoneMute(false));
+    EXPECT_EQ(0, audio_device_->MicrophoneMute(&enabled));
+    EXPECT_FALSE(enabled);
+  }
+
+  // reinitialize the default device (0) and modify/retrieve the Mute
+  EXPECT_EQ(0, audio_device_->SetRecordingDevice(0));
+  EXPECT_EQ(0, audio_device_->MicrophoneMuteIsAvailable(&available));
+  if (available) {
+    EXPECT_EQ(0, audio_device_->InitMicrophone());
+    EXPECT_EQ(0, audio_device_->SetMicrophoneMute(true));
+    EXPECT_EQ(0, audio_device_->MicrophoneMute(&enabled));
+    EXPECT_TRUE(enabled);
+    EXPECT_EQ(0, audio_device_->SetMicrophoneMute(false));
+    EXPECT_EQ(0, audio_device_->MicrophoneMute(&enabled));
+    EXPECT_FALSE(enabled);
+  }
+}
+
+TEST_F(AudioDeviceAPITest, MicrophoneBoostTests) {
+  bool available;
+  bool enabled;
+  CheckInitialRecordingStates();
+
+  // fail tests
+  EXPECT_EQ(-1, audio_device_->SetMicrophoneBoost(true));
+  // requires initialization
+  EXPECT_EQ(-1, audio_device_->MicrophoneBoost(&enabled));
+
+#if defined(WEBRTC_WINDOWS_CORE_AUDIO_BUILD)
+  // initialize kDefaultCommunicationDevice and modify/retrieve the boost
+  EXPECT_TRUE(audio_device_->SetRecordingDevice(
+          AudioDeviceModule::kDefaultCommunicationDevice) == 0);
+  EXPECT_EQ(0, audio_device_->MicrophoneBoostIsAvailable(&available));
+  if (available)
+  {
+    EXPECT_EQ(0, audio_device_->InitMicrophone());
+    EXPECT_EQ(0, audio_device_->SetMicrophoneBoost(true));
+    EXPECT_EQ(0, audio_device_->MicrophoneBoost(&enabled));
+    EXPECT_TRUE(enabled);
+    EXPECT_EQ(0, audio_device_->SetMicrophoneBoost(false));
+    EXPECT_EQ(0, audio_device_->MicrophoneBoost(&enabled));
+    EXPECT_FALSE(enabled);
+  }
+#endif
+
+  // reinitialize kDefaultDevice and modify/retrieve the boost
+  EXPECT_EQ(0, audio_device_->SetRecordingDevice(MACRO_DEFAULT_DEVICE));
+  EXPECT_EQ(0, audio_device_->MicrophoneBoostIsAvailable(&available));
+  if (available) {
+    EXPECT_EQ(0, audio_device_->InitMicrophone());
+    EXPECT_EQ(0, audio_device_->SetMicrophoneBoost(true));
+    EXPECT_EQ(0, audio_device_->MicrophoneBoost(&enabled));
+    EXPECT_TRUE(enabled);
+    EXPECT_EQ(0, audio_device_->SetMicrophoneBoost(false));
+    EXPECT_EQ(0, audio_device_->MicrophoneBoost(&enabled));
+    EXPECT_FALSE(enabled);
+  }
+
+  // reinitialize the default device (0) and modify/retrieve the boost
+  EXPECT_EQ(0, audio_device_->SetRecordingDevice(0));
+  EXPECT_EQ(0, audio_device_->MicrophoneBoostIsAvailable(&available));
+  if (available) {
+    EXPECT_EQ(0, audio_device_->InitMicrophone());
+    EXPECT_EQ(0, audio_device_->SetMicrophoneBoost(true));
+    EXPECT_EQ(0, audio_device_->MicrophoneBoost(&enabled));
+    EXPECT_TRUE(enabled);
+    EXPECT_EQ(0, audio_device_->SetMicrophoneBoost(false));
+    EXPECT_EQ(0, audio_device_->MicrophoneBoost(&enabled));
+    EXPECT_FALSE(enabled);
+  }
+}
+
+TEST_F(AudioDeviceAPITest, StereoPlayoutTests) {
+  CheckInitialPlayoutStates();
+
+  // fail tests
+  EXPECT_EQ(-1, audio_device_->InitPlayout());
+  EXPECT_EQ(0, audio_device_->SetPlayoutDevice(
+      MACRO_DEFAULT_COMMUNICATION_DEVICE));
+
+  // TODO(kjellander): Fix so these tests pass on Mac.
+#if !defined(WEBRTC_MAC)
+  EXPECT_EQ(0, audio_device_->InitPlayout());
+  EXPECT_TRUE(audio_device_->PlayoutIsInitialized());
+  // must be performed before initialization
+  EXPECT_EQ(-1, audio_device_->SetStereoPlayout(true));
+#endif
+
+  // ensure that we can set the stereo mode for playout
+  EXPECT_EQ(0, audio_device_->StopPlayout());
+  EXPECT_FALSE(audio_device_->PlayoutIsInitialized());
+
+  // initialize kDefaultCommunicationDevice and modify/retrieve stereo support
+  EXPECT_EQ(0, audio_device_->SetPlayoutDevice(
+      MACRO_DEFAULT_COMMUNICATION_DEVICE));
+  bool available;
+  bool enabled;
+  EXPECT_EQ(0, audio_device_->StereoPlayoutIsAvailable(&available));
+  if (available) {
+    EXPECT_EQ(0, audio_device_->SetStereoPlayout(true));
+    EXPECT_EQ(0, audio_device_->StereoPlayout(&enabled));
+    EXPECT_TRUE(enabled);
+    EXPECT_EQ(0, audio_device_->SetStereoPlayout(false));
+    EXPECT_EQ(0, audio_device_->StereoPlayout(&enabled));
+    EXPECT_FALSE(enabled);
+    EXPECT_EQ(0, audio_device_->SetStereoPlayout(true));
+    EXPECT_EQ(0, audio_device_->StereoPlayout(&enabled));
+    EXPECT_TRUE(enabled);
+  }
+
+  // initialize kDefaultDevice and modify/retrieve stereo support
+  EXPECT_EQ(0, audio_device_->SetPlayoutDevice(MACRO_DEFAULT_DEVICE));
+  EXPECT_EQ(0, audio_device_->StereoPlayoutIsAvailable(&available));
+  if (available) {
+    EXPECT_EQ(0, audio_device_->SetStereoPlayout(true));
+    EXPECT_EQ(0, audio_device_->StereoPlayout(&enabled));
+    EXPECT_TRUE(enabled);
+    EXPECT_EQ(0, audio_device_->SetStereoPlayout(false));
+    EXPECT_EQ(0, audio_device_->StereoPlayout(&enabled));
+    EXPECT_FALSE(enabled);
+    EXPECT_EQ(0, audio_device_->SetStereoPlayout(true));
+    EXPECT_EQ(0, audio_device_->StereoPlayout(&enabled));
+    EXPECT_TRUE(enabled);
+  }
+
+  // initialize default device (0) and modify/retrieve stereo support
+  EXPECT_EQ(0, audio_device_->SetPlayoutDevice(0));
+  EXPECT_EQ(0, audio_device_->StereoPlayoutIsAvailable(&available));
+  if (available) {
+    EXPECT_EQ(0, audio_device_->SetStereoPlayout(true));
+    EXPECT_EQ(0, audio_device_->StereoPlayout(&enabled));
+    EXPECT_TRUE(enabled);
+    EXPECT_EQ(0, audio_device_->SetStereoPlayout(false));
+    EXPECT_EQ(0, audio_device_->StereoPlayout(&enabled));
+    EXPECT_FALSE(enabled);
+    EXPECT_EQ(0, audio_device_->SetStereoPlayout(true));
+    EXPECT_EQ(0, audio_device_->StereoPlayout(&enabled));
+    EXPECT_TRUE(enabled);
+  }
+}
+
+TEST_F(AudioDeviceAPITest, StereoRecordingTests) {
+  CheckInitialRecordingStates();
+  EXPECT_FALSE(audio_device_->Playing());
+
+  // fail tests
+  EXPECT_EQ(-1, audio_device_->InitRecording());
+  EXPECT_EQ(0, audio_device_->SetRecordingDevice(
+      MACRO_DEFAULT_COMMUNICATION_DEVICE));
+
+  // TODO(kjellander): Fix so these tests pass on Mac.
+#if !defined(WEBRTC_MAC)
+  EXPECT_EQ(0, audio_device_->InitRecording());
+  EXPECT_TRUE(audio_device_->RecordingIsInitialized());
+  // must be performed before initialization
+  EXPECT_EQ(-1, audio_device_->SetStereoRecording(true));
+#endif
+  // ensures that we can set the stereo mode for recording
+  EXPECT_EQ(0, audio_device_->StopRecording());
+  EXPECT_FALSE(audio_device_->RecordingIsInitialized());
+
+  // initialize kDefaultCommunicationDevice and modify/retrieve stereo support
+  EXPECT_EQ(0, audio_device_->SetRecordingDevice(
+      MACRO_DEFAULT_COMMUNICATION_DEVICE));
+  bool available;
+  bool enabled;
+  EXPECT_EQ(0, audio_device_->StereoRecordingIsAvailable(&available));
+  if (available) {
+    EXPECT_EQ(0, audio_device_->SetStereoRecording(true));
+    EXPECT_EQ(0, audio_device_->StereoRecording(&enabled));
+    EXPECT_TRUE(enabled);
+    EXPECT_EQ(0, audio_device_->SetStereoRecording(false));
+    EXPECT_EQ(0, audio_device_->StereoRecording(&enabled));
+    EXPECT_FALSE(enabled);
+  }
+
+  // initialize kDefaultDevice and modify/retrieve stereo support
+  EXPECT_EQ(0, audio_device_->SetRecordingDevice(MACRO_DEFAULT_DEVICE));
+  EXPECT_EQ(0, audio_device_->StereoRecordingIsAvailable(&available));
+  if (available) {
+    EXPECT_EQ(0, audio_device_->SetStereoRecording(true));
+    EXPECT_EQ(0, audio_device_->StereoRecording(&enabled));
+    EXPECT_TRUE(enabled);
+    EXPECT_EQ(0, audio_device_->SetStereoRecording(false));
+    EXPECT_EQ(0, audio_device_->StereoRecording(&enabled));
+    EXPECT_FALSE(enabled);
+  }
+
+  // initialize default device (0) and modify/retrieve stereo support
+  EXPECT_EQ(0, audio_device_->SetRecordingDevice(0));
+  EXPECT_EQ(0, audio_device_->StereoRecordingIsAvailable(&available));
+  if (available) {
+    EXPECT_EQ(0, audio_device_->SetStereoRecording(true));
+    EXPECT_EQ(0, audio_device_->StereoRecording(&enabled));
+    EXPECT_TRUE(enabled);
+    EXPECT_EQ(0, audio_device_->SetStereoRecording(false));
+    EXPECT_EQ(0, audio_device_->StereoRecording(&enabled));
+    EXPECT_FALSE(enabled);
+  }
+}
+
+TEST_F(AudioDeviceAPITest, PlayoutBufferTests) {
+  AudioDeviceModule::BufferType bufferType;
+  uint16_t sizeMS(0);
+
+  CheckInitialPlayoutStates();
+  EXPECT_EQ(0, audio_device_->PlayoutBuffer(&bufferType, &sizeMS));
+#if defined(WEBRTC_WINDOWS_CORE_AUDIO_BUILD) || defined(ANDROID) || \
+    defined(WEBRTC_IOS)
+  EXPECT_EQ(AudioDeviceModule::kAdaptiveBufferSize, bufferType);
+#else
+  EXPECT_EQ(AudioDeviceModule::kFixedBufferSize, bufferType);
+#endif
+
+  // fail tests
+  EXPECT_EQ(-1, audio_device_->InitPlayout());
+  // must set device first
+  EXPECT_EQ(0, audio_device_->SetPlayoutDevice(
+      MACRO_DEFAULT_COMMUNICATION_DEVICE));
+
+  // TODO(kjellander): Fix so these tests pass on Mac.
+#if !defined(WEBRTC_MAC)
+  EXPECT_EQ(0, audio_device_->InitPlayout());
+  EXPECT_TRUE(audio_device_->PlayoutIsInitialized());
+#endif
+  EXPECT_TRUE(audio_device_->SetPlayoutBuffer(
+      AudioDeviceModule::kAdaptiveBufferSize, 100) == -1);
+  EXPECT_EQ(0, audio_device_->StopPlayout());
+  EXPECT_TRUE(audio_device_->SetPlayoutBuffer(
+      AudioDeviceModule::kFixedBufferSize, kAdmMinPlayoutBufferSizeMs-1) == -1);
+  EXPECT_TRUE(audio_device_->SetPlayoutBuffer(
+      AudioDeviceModule::kFixedBufferSize, kAdmMaxPlayoutBufferSizeMs+1) == -1);
+
+  // bulk tests (all should be successful)
+  EXPECT_FALSE(audio_device_->PlayoutIsInitialized());
+#if defined(WEBRTC_WINDOWS_CORE_AUDIO_BUILD)
+  EXPECT_EQ(0, audio_device_->SetPlayoutBuffer(
+      AudioDeviceModule::kAdaptiveBufferSize, 0));
+  EXPECT_EQ(0, audio_device_->PlayoutBuffer(&bufferType, &sizeMS));
+  EXPECT_EQ(AudioDeviceModule::kAdaptiveBufferSize, bufferType);
+  EXPECT_EQ(0, audio_device_->SetPlayoutBuffer(
+      AudioDeviceModule::kAdaptiveBufferSize, 10000));
+  EXPECT_EQ(0, audio_device_->PlayoutBuffer(&bufferType, &sizeMS));
+  EXPECT_EQ(AudioDeviceModule::kAdaptiveBufferSize, bufferType);
+#endif
+#if defined(ANDROID) || defined(WEBRTC_IOS)
+  EXPECT_EQ(-1,
+            audio_device_->SetPlayoutBuffer(AudioDeviceModule::kFixedBufferSize,
+                                          kAdmMinPlayoutBufferSizeMs));
+#else
+  EXPECT_EQ(0, audio_device_->SetPlayoutBuffer(
+      AudioDeviceModule::kFixedBufferSize, kAdmMinPlayoutBufferSizeMs));
+  EXPECT_EQ(0, audio_device_->PlayoutBuffer(&bufferType, &sizeMS));
+  EXPECT_EQ(AudioDeviceModule::kFixedBufferSize, bufferType);
+  EXPECT_EQ(kAdmMinPlayoutBufferSizeMs, sizeMS);
+  EXPECT_EQ(0, audio_device_->SetPlayoutBuffer(
+      AudioDeviceModule::kFixedBufferSize, kAdmMaxPlayoutBufferSizeMs));
+  EXPECT_EQ(0, audio_device_->PlayoutBuffer(&bufferType, &sizeMS));
+  EXPECT_EQ(AudioDeviceModule::kFixedBufferSize, bufferType);
+  EXPECT_EQ(kAdmMaxPlayoutBufferSizeMs, sizeMS);
+  EXPECT_EQ(0, audio_device_->SetPlayoutBuffer(
+      AudioDeviceModule::kFixedBufferSize, 100));
+  EXPECT_EQ(0, audio_device_->PlayoutBuffer(&bufferType, &sizeMS));
+  EXPECT_EQ(AudioDeviceModule::kFixedBufferSize, bufferType);
+  EXPECT_EQ(100, sizeMS);
+#endif
+
+#if defined(WEBRTC_WINDOWS_CORE_AUDIO_BUILD)
+  // restore default
+  EXPECT_EQ(0, audio_device_->SetPlayoutBuffer(
+      AudioDeviceModule::kAdaptiveBufferSize, 0));
+  EXPECT_EQ(0, audio_device_->PlayoutBuffer(&bufferType, &sizeMS));
+#endif
+}
+
+TEST_F(AudioDeviceAPITest, PlayoutDelay) {
+  // NOTE: this API is better tested in a functional test
+  uint16_t sizeMS(0);
+  CheckInitialPlayoutStates();
+  // bulk tests
+  EXPECT_EQ(0, audio_device_->PlayoutDelay(&sizeMS));
+  EXPECT_EQ(0, audio_device_->PlayoutDelay(&sizeMS));
+}
+
+TEST_F(AudioDeviceAPITest, RecordingDelay) {
+  // NOTE: this API is better tested in a functional test
+  uint16_t sizeMS(0);
+  CheckInitialRecordingStates();
+
+  // bulk tests
+  EXPECT_EQ(0, audio_device_->RecordingDelay(&sizeMS));
+  EXPECT_EQ(0, audio_device_->RecordingDelay(&sizeMS));
+}
+
+TEST_F(AudioDeviceAPITest, CPULoad) {
+  // NOTE: this API is better tested in a functional test
+  uint16_t load(0);
+
+  // bulk tests
+#if defined(WEBRTC_WINDOWS_CORE_AUDIO_BUILD)
+  EXPECT_EQ(0, audio_device_->CPULoad(&load));
+  EXPECT_EQ(0, load);
+#else
+  EXPECT_EQ(-1, audio_device_->CPULoad(&load));
+#endif
+}
+
+// TODO(kjellander): Fix flakiness causing failures on Windows.
+// TODO(phoglund):  Fix flakiness causing failures on Linux.
+#if !defined(_WIN32) && !defined(WEBRTC_LINUX)
+TEST_F(AudioDeviceAPITest, StartAndStopRawOutputFileRecording) {
+  // NOTE: this API is better tested in a functional test
+  CheckInitialPlayoutStates();
+
+  // fail tests
+  EXPECT_EQ(-1, audio_device_->StartRawOutputFileRecording(NULL));
+
+  // bulk tests
+  EXPECT_EQ(0, audio_device_->StartRawOutputFileRecording(
+      GetFilename("raw_output_not_playing.pcm")));
+  EXPECT_EQ(0, audio_device_->StopRawOutputFileRecording());
+  EXPECT_EQ(0, audio_device_->SetPlayoutDevice(
+      MACRO_DEFAULT_COMMUNICATION_DEVICE));
+
+  // TODO(kjellander): Fix so these tests pass on Mac.
+#if !defined(WEBRTC_MAC)
+  EXPECT_EQ(0, audio_device_->InitPlayout());
+  EXPECT_EQ(0, audio_device_->StartPlayout());
+#endif
+
+  EXPECT_EQ(0, audio_device_->StartRawOutputFileRecording(
+      GetFilename("raw_output_playing.pcm")));
+  SleepMs(100);
+  EXPECT_EQ(0, audio_device_->StopRawOutputFileRecording());
+  EXPECT_EQ(0, audio_device_->StopPlayout());
+  EXPECT_EQ(0, audio_device_->StartRawOutputFileRecording(
+      GetFilename("raw_output_not_playing.pcm")));
+  EXPECT_EQ(0, audio_device_->StopRawOutputFileRecording());
+
+  // results after this test:
+  //
+  // - size of raw_output_not_playing.pcm shall be 0
+  // - size of raw_output_playing.pcm shall be > 0
+}
+
+TEST_F(AudioDeviceAPITest, StartAndStopRawInputFileRecording) {
+  // NOTE: this API is better tested in a functional test
+  CheckInitialRecordingStates();
+  EXPECT_FALSE(audio_device_->Playing());
+
+  // fail tests
+  EXPECT_EQ(-1, audio_device_->StartRawInputFileRecording(NULL));
+
+  // bulk tests
+  EXPECT_EQ(0, audio_device_->StartRawInputFileRecording(
+      GetFilename("raw_input_not_recording.pcm")));
+  EXPECT_EQ(0, audio_device_->StopRawInputFileRecording());
+  EXPECT_EQ(0, audio_device_->SetRecordingDevice(MACRO_DEFAULT_DEVICE));
+
+  // TODO(kjellander): Fix so these tests pass on Mac.
+#if !defined(WEBRTC_MAC)
+  EXPECT_EQ(0, audio_device_->InitRecording());
+  EXPECT_EQ(0, audio_device_->StartRecording());
+#endif
+  EXPECT_EQ(0, audio_device_->StartRawInputFileRecording(
+      GetFilename("raw_input_recording.pcm")));
+  SleepMs(100);
+  EXPECT_EQ(0, audio_device_->StopRawInputFileRecording());
+  EXPECT_EQ(0, audio_device_->StopRecording());
+  EXPECT_EQ(0, audio_device_->StartRawInputFileRecording(
+      GetFilename("raw_input_not_recording.pcm")));
+  EXPECT_EQ(0, audio_device_->StopRawInputFileRecording());
+
+  // results after this test:
+  //
+  // - size of raw_input_not_recording.pcm shall be 0
+  // - size of raw_input_not_recording.pcm shall be > 0
+}
+#endif  // !WIN32 && !WEBRTC_LINUX
+
+TEST_F(AudioDeviceAPITest, RecordingSampleRate) {
+  uint32_t sampleRate(0);
+
+  // bulk tests
+  EXPECT_EQ(0, audio_device_->RecordingSampleRate(&sampleRate));
+#if defined(_WIN32) && !defined(WEBRTC_WINDOWS_CORE_AUDIO_BUILD)
+  EXPECT_EQ(48000, sampleRate);
+#elif defined(ANDROID)
+  TEST_LOG("Recording sample rate is %u\n\n", sampleRate);
+  EXPECT_TRUE((sampleRate == 44000) || (sampleRate == 16000));
+#elif defined(WEBRTC_IOS)
+  TEST_LOG("Recording sample rate is %u\n\n", sampleRate);
+  EXPECT_TRUE((sampleRate == 44000) || (sampleRate == 16000) ||
+              (sampleRate == 8000));
+#endif
+
+  // @TODO(xians) - add tests for all platforms here...
+}
+
+TEST_F(AudioDeviceAPITest, PlayoutSampleRate) {
+  uint32_t sampleRate(0);
+
+  // bulk tests
+  EXPECT_EQ(0, audio_device_->PlayoutSampleRate(&sampleRate));
+#if defined(_WIN32) && !defined(WEBRTC_WINDOWS_CORE_AUDIO_BUILD)
+  EXPECT_EQ(48000, sampleRate);
+#elif defined(ANDROID)
+  TEST_LOG("Playout sample rate is %u\n\n", sampleRate);
+  EXPECT_TRUE((sampleRate == 44000) || (sampleRate == 16000));
+#elif defined(WEBRTC_IOS)
+  TEST_LOG("Playout sample rate is %u\n\n", sampleRate);
+  EXPECT_TRUE((sampleRate == 44000) || (sampleRate == 16000) ||
+              (sampleRate == 8000));
+#endif
+}