Add test coverage for CrasAudioHandler.

chromeos/dbus/cras_audio_client_stub_impl.h

Index: chromeos/dbus/cras_audio_client_stub_impl.h
diff --git a/chromeos/dbus/cras_audio_client_stub_impl.h b/chromeos/dbus/cras_audio_client_stub_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..032305f04e73c3e6e83b74fa956d0749476a953a
--- /dev/null
+++ b/chromeos/dbus/cras_audio_client_stub_impl.h
@@ -0,0 +1,52 @@
+// Copyright (c) 2013 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.
+
+#ifndef CHROMEOS_DBUS_CRAS_AUDIO_CLIENT_STUB_IMPL_H_
+#define CHROMEOS_DBUS_CRAS_AUDIO_CLIENT_STUB_IMPL_H_
+
+#include "chromeos/dbus/cras_audio_client.h"
+
+namespace chromeos {
+
+class CrasAudioHandlerTest;
+
+// The CrasAudioClient implementation used on Linux desktop.
+class CrasAudioClientStubImpl : public CrasAudioClient {
+ public:
+  CrasAudioClientStubImpl();
+  virtual ~CrasAudioClientStubImpl();
+
+  // CrasAudioClient overrides:
+  virtual void AddObserver(Observer* observer) OVERRIDE;
+  virtual void RemoveObserver(Observer* observer) OVERRIDE;
+  virtual bool HasObserver(Observer* observer) OVERRIDE;
+  virtual void GetVolumeState(const GetVolumeStateCallback& callback) OVERRIDE;
+  virtual void GetNodes(const GetNodesCallback& callback) OVERRIDE;
+  virtual void SetOutputNodeVolume(uint64 node_id, int32 volume) OVERRIDE;
+  virtual void SetOutputUserMute(bool mute_on) OVERRIDE;
+  virtual void SetInputNodeGain(uint64 node_id, int32 gain) OVERRIDE;
+  virtual void SetInputMute(bool mute_on) OVERRIDE;
+  virtual void SetActiveOutputNode(uint64 node_id) OVERRIDE;
+  virtual void SetActiveInputNode(uint64 node_id) OVERRIDE;
+
+ protected:
+  // Helper functions for testing
+  virtual void SetAudioDevices(const AudioNodeList& audio_nodes);
+  virtual void ChangeAudioNodes(const AudioNodeList& new_nodes);
+
+ private:
+  friend class CrasAudioHandlerTest;
+
+  VolumeState volume_state_;
+  AudioNodeList node_list_;
+  uint64 active_input_node_id_;
+  uint64 active_output_node_id_;
+  ObserverList<Observer> observers_;
+
+  DISALLOW_COPY_AND_ASSIGN(CrasAudioClientStubImpl);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROMEOS_DBUS_CRAS_AUDIO_CLIENT_STUB_IMPL_H_