diff --git a/mock_payload_state.h b/mock_payload_state.h
new file mode 100644
index 0000000..bb60e98
--- /dev/null
+++ b/mock_payload_state.h
@@ -0,0 +1,20 @@
+// Copyright (c) 2012 The Chromium OS 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_PLATFORM_UPDATE_ENGINE_MOCK_PAYLOAD_STATE_H__
+#define CHROMEOS_PLATFORM_UPDATE_ENGINE_MOCK_PAYLOAD_STATE_H__
+
+#include "gmock/gmock.h"
+#include "update_engine/payload_state.h"
+
+namespace chromeos_update_engine {
+
+class MockPayloadState: public PayloadState {
+ public:
+  MOCK_METHOD1(UpdateFailed, void(ActionExitCode error));
+};
+
+}  // namespace chromeos_update_engine
+
+#endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_MOCK_PAYLOAD_STATE_H__