Adding GetAudioInputDeviceNames to AudioManager, this function is supposed to do device enumerati...

media/audio/audio_input_device_unittest.cc

+// Copyright (c) 2011 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_manager.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace media {
+
+// Test that devices can be enumerated.
+TEST(AudioInputDeviceTest, EnumerateDevices) {
+  AudioDeviceNames device_names;
+  ASSERT_TRUE(AudioManager::GetAudioManager() != NULL);
+  AudioManager::GetAudioManager()->GetAudioInputDeviceNames(
+      &device_names);
+  if (!device_names.empty()) {
+    AudioDeviceNames::const_iterator it = device_names.begin();
+    // The first device in the list is the prepended default device.
+    EXPECT_EQ("Default", it->device_name);
+    EXPECT_EQ("0", it->unique_id);
+    ++it;
+
+    // Other devices should have non-empty name and id.
+    while (it != device_names.end()) {
+      EXPECT_EQ("", it->device_name);
+      EXPECT_EQ("", it->unique_id);
+      ++it;
+    }
+  }
+}
+
+}  // namespace media