Handle audio device changes on Mac

media/audio/mac/audio_device_listener_mac_unittest.cc

Index: media/audio/mac/audio_device_listener_mac_unittest.cc
diff --git a/media/audio/mac/audio_device_listener_mac_unittest.cc b/media/audio/mac/audio_device_listener_mac_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c2c75c916805d2d0c92b1641bccf95d6ccf925eb
--- /dev/null
+++ b/media/audio/mac/audio_device_listener_mac_unittest.cc
@@ -0,0 +1,31 @@
+// 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 "base/bind.h"
+#include "media/audio/mac/audio_device_listener_mac.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+class AudioDeviceListenerDelegate {
+ public:
+  MOCK_METHOD0(OnDeviceChange, void());
+};
+
+}  // namespace
+
+namespace media {
+
+// Simulate a device change event and ensure we get the right callback.
+TEST(AudioDeviceListenerMacTest, OutputDeviceChange) {
+  AudioDeviceListenerDelegate delegate;
+  AudioDeviceListenerMac output_device_listener(base::Bind(
+      &AudioDeviceListenerDelegate::OnDeviceChange,
+      base::Unretained(&delegate)));
+  EXPECT_CALL(delegate, OnDeviceChange()).Times(1);
+  output_device_listener.OnDefaultDeviceChanged();
+}
+
+}  // namespace media