Switch Speech Recognition to asynchronous callback-based AudioManager interactions.

media/audio/audio_system_impl_unittest.cc

+// Copyright 2017 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/audio_system_impl.h"
+#include "base/memory/ptr_util.h"
+#include "base/run_loop.h"
+#include "base/single_thread_task_runner.h"
+#include "base/task_runner_util.h"
+#include "base/threading/thread.h"
+#include "base/threading/thread_checker.h"
+#include "base/threading/thread_task_runner_handle.h"
+#include "media/audio/audio_device_description.h"
+#include "media/audio/mock_audio_manager.h"
+#include "media/base/test_helpers.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace media {
+
+class AudioSystemImplTest : public testing::TestWithParam<bool> {
+ public:
+  AudioSystemImplTest()
+      : use_audio_thread_(GetParam()), audio_thread_("AudioSystemThread") {
+    if (use_audio_thread_) {
+      audio_thread_.StartAndWaitForTesting();
+      audio_manager_.reset(
+          new media::MockAudioManager(audio_thread_.task_runner()));
+    } else {
+      audio_manager_.reset(new media::MockAudioManager(
+          base::ThreadTaskRunnerHandle::Get().get()));
+    }
+    audio_manager_->SetInputStreamParameters(
+        media::AudioParameters::UnavailableDeviceParams());
+    audio_system_ = media::AudioSystemImpl::Create(audio_manager_.get());
+  }
+
+  ~AudioSystemImplTest() override {
+    // Deleting |audio_manager_| on its thread.
+    audio_manager_.reset();
+    audio_thread_.Stop();
+  }
+
+  void OnAudioParams(const AudioParameters& expected,
+                     const AudioParameters& received) {
+    EXPECT_TRUE(thread_checker_.CalledOnValidThread());
+    EXPECT_EQ(expected.AsHumanReadableString(),
+              received.AsHumanReadableString());
+    AudioParametersReceived();
+  }
+
+  void WaitForCallback() {
+    if (!use_audio_thread_) {
+      base::RunLoop().RunUntilIdle();
+      return;
+    }
+    media::WaitableMessageLoopEvent event;
+    audio_thread_.task_runner()->PostTaskAndReply(
+        FROM_HERE, base::Bind(&base::DoNothing), event.GetClosure());
+    // Runs the loop and waits for the |audio_thread_| to call event's closure,
+    // which means AudioSystem reply containing device parameters is already
+    // queued on the main thread.
+    event.RunAndWait();
+    base::RunLoop().RunUntilIdle();
+  }
+
+  MOCK_METHOD0(AudioParametersReceived, void(void));
+
+ protected:
+  base::MessageLoop message_loop_;
+  base::ThreadChecker thread_checker_;
+  bool use_audio_thread_;
+  base::Thread audio_thread_;
+  MockAudioManager::UniquePtr audio_manager_;
+  std::unique_ptr<media::AudioSystem> audio_system_;
+};
+
+TEST_P(AudioSystemImplTest, GetInputStreamParameters) {
+  EXPECT_CALL(*this, AudioParametersReceived());
+  audio_system_->GetInputStreamParameters(
+      media::AudioDeviceDescription::kDefaultDeviceId,
+      base::Bind(&AudioSystemImplTest::OnAudioParams, base::Unretained(this),
+                 media::AudioParameters::UnavailableDeviceParams()));
+  WaitForCallback();
+}
+
+TEST_P(AudioSystemImplTest, GetInputStreamParametersNoDevice) {
+  audio_manager_->SetHasInputDevices(false);
+  EXPECT_CALL(*this, AudioParametersReceived());
+  audio_system_->GetInputStreamParameters(
+      media::AudioDeviceDescription::kDefaultDeviceId,
+      base::Bind(&AudioSystemImplTest::OnAudioParams, base::Unretained(this),
+                 media::AudioParameters()));
+  WaitForCallback();
+}
+
+INSTANTIATE_TEST_CASE_P(, AudioSystemImplTest, testing::Values(false, true));
+
+}  // namespace media