diff --git a/fake_hardware.h b/fake_hardware.h
new file mode 100644
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--- /dev/null
+++ b/fake_hardware.h
@@ -0,0 +1,43 @@
+// Copyright (c) 2013 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_FAKE_HARDWARE_H__
+#define CHROMEOS_PLATFORM_UPDATE_ENGINE_FAKE_HARDWARE_H__
+
+#include "update_engine/hardware_interface.h"
+
+#include "base/basictypes.h"
+
+#include <map>
+
+namespace chromeos_update_engine {
+
+// Implements a fake hardware interface used for testing.
+class FakeHardware : public HardwareInterface {
+ public:
+  FakeHardware() {}
+
+  // HardwareInterface methods.
+  virtual const std::string BootDevice() { return boot_device_; }
+  virtual const std::string KernelDeviceOfBootDevice(
+      const std::string& boot_device);
+
+  // Setters
+  void SetBootDevice(const std::string boot_device) {
+    boot_device_ = boot_device;
+  }
+  void SetKernelDeviceOfBootDevice(const std::string& boot_device,
+                                   const std::string& kernel_device);
+
+ private:
+  std::string boot_device_;
+  typedef std::map<std::string, std::string> KernelDevicesMap;
+  KernelDevicesMap kernel_devices_;
+
+  DISALLOW_COPY_AND_ASSIGN(FakeHardware);
+};
+
+}  // namespace chromeos_update_engine
+
+#endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_FAKE_HARDWARE_H__