diff --git a/fake_system_state.cc b/fake_system_state.cc
new file mode 100644
index 0000000..a4fbbeb
--- /dev/null
+++ b/fake_system_state.cc
@@ -0,0 +1,37 @@
+// 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.
+
+#include "update_engine/fake_system_state.h"
+#include "update_engine/policy_manager/fake_state.h"
+
+using chromeos_policy_manager::FakeState;
+
+namespace chromeos_update_engine {
+
+// Mock the SystemStateInterface so that we could lie that
+// OOBE is completed even when there's no such marker file, etc.
+FakeSystemState::FakeSystemState()
+  : mock_connection_manager_(this),
+    mock_update_attempter_(this, &dbus_),
+    default_request_params_(this),
+    clock_(&fake_clock_),
+    connection_manager_(&mock_connection_manager_),
+    hardware_(&fake_hardware_),
+    metrics_lib_(&mock_metrics_lib_),
+    prefs_(&mock_prefs_),
+    powerwash_safe_prefs_(&mock_powerwash_safe_prefs_),
+    payload_state_(&mock_payload_state_),
+    gpio_handler_(&mock_gpio_handler_),
+    update_attempter_(&mock_update_attempter_),
+    request_params_(&default_request_params_),
+    p2p_manager_(&mock_p2p_manager_),
+    policy_manager_(&fake_policy_manager_),
+    device_policy_(nullptr),
+    fake_system_rebooted_(false) {
+  mock_payload_state_.Initialize(this);
+  mock_update_attempter_.Init();
+  fake_policy_manager_.Init(FakeState::Construct());
+}
+
+}  // namespace chromeos_update_engine