Add play test.

media/audio/mac/audio_low_latency_input_mac_unittest.cc

 // Copyright (c) 2012 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 <stdint.h>
 
 #include <memory>
 
 #include "base/environment.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/test/test_timeouts.h"
 #include "base/threading/platform_thread.h"
 #include "media/audio/audio_device_description.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_manager_base.h"
 #include "media/audio/audio_unittest_util.h"
 #include "media/audio/mac/audio_low_latency_input_mac.h"
+#include "media/audio/simple_sources.h"
 #include "media/base/seekable_buffer.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using ::testing::_;
 using ::testing::AnyNumber;
 using ::testing::AtLeast;
 using ::testing::Ge;
 using ::testing::NotNull;
 
@@ skipping 249 matching lines @@
   fprintf(stderr, "               Sample rate: %d\n", fs);
   WriteToFileAudioSink file_sink(file_name);
   fprintf(stderr, "               >> Speak into the mic while recording...\n");
   ais->Start(&file_sink);
   base::PlatformThread::Sleep(TestTimeouts::action_timeout());
   ais->Stop();
   fprintf(stderr, "               >> Recording has stopped.\n");
   ais->Close();
 }
 
+TEST_F(MacAudioInputTest, AudioOutputTest) {
+  AudioParameters params = audio_manager_->GetDefaultOutputStreamParameters();
+  LOG(ERROR) << "Params: " << params.AsHumanReadableString();
+
+  SineWaveAudioSource source(params.channels(), 440, params.sample_rate());
+  AudioOutputStream* stream =
+      audio_manager_->MakeAudioOutputStreamProxy(params, "");
+  ASSERT_TRUE(stream->Open());
+  stream->Start(&source);
+
+  base::RunLoop run_loop;
+  message_loop_.task_runner()->PostDelayedTask(
+      FROM_HERE, run_loop.QuitClosure(), base::TimeDelta::FromSeconds(5));
+  run_loop.Run();
+  stream->Stop();
+  stream->Close();
+}
+
 }  // namespace media