diff --git a/fake_p2p_manager.h b/fake_p2p_manager.h
new file mode 100644
index 0000000..87788bf
--- /dev/null
+++ b/fake_p2p_manager.h
@@ -0,0 +1,116 @@
+// 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_P2P_MANAGER_H__
+#define CHROMEOS_PLATFORM_UPDATE_ENGINE_FAKE_P2P_MANAGER_H__
+
+#include "p2p_manager.h"
+
+namespace chromeos_update_engine {
+
+// A fake implementation of P2PManager.
+class FakeP2PManager : public P2PManager {
+public:
+  FakeP2PManager() :
+    is_p2p_enabled_(false),
+    ensure_p2p_running_result_(false),
+    ensure_p2p_not_running_result_(false),
+    perform_housekeeping_result_(false),
+    count_shared_files_result_(0) {}
+
+  virtual ~FakeP2PManager() {}
+
+  // P2PManager overrides.
+  virtual bool IsP2PEnabled() {
+    return is_p2p_enabled_;
+  }
+
+  virtual bool EnsureP2PRunning() {
+    return ensure_p2p_running_result_;
+  }
+
+  virtual bool EnsureP2PNotRunning() {
+    return ensure_p2p_not_running_result_;
+  }
+
+  virtual bool PerformHousekeeping() {
+    return perform_housekeeping_result_;
+  }
+
+  virtual void LookupUrlForFile(const std::string& file_id,
+                                size_t minimum_size,
+                                base::TimeDelta max_time_to_wait,
+                                LookupCallback callback) {
+    callback.Run(lookup_url_for_file_result_);
+  }
+
+  virtual bool FileShare(const std::string& file_id,
+                         size_t expected_size) {
+    return false;
+  }
+
+  virtual base::FilePath FileGetPath(const std::string& file_id) {
+    return base::FilePath();
+  }
+
+  virtual ssize_t FileGetSize(const std::string& file_id) {
+    return -1;
+  }
+
+  virtual ssize_t FileGetExpectedSize(const std::string& file_id) {
+    return -1;
+  }
+
+  virtual bool FileGetVisible(const std::string& file_id,
+                              bool *out_result) {
+    return false;
+  }
+
+  virtual bool FileMakeVisible(const std::string& file_id) {
+    return false;
+  }
+
+  virtual int CountSharedFiles() {
+    return count_shared_files_result_;
+  }
+
+  // Methods for controlling what the fake returns and how it acts.
+  void SetP2PEnabled(bool is_p2p_enabled) {
+    is_p2p_enabled_ = is_p2p_enabled;
+  }
+
+  void SetEnsureP2PRunningResult(bool ensure_p2p_running_result) {
+    ensure_p2p_running_result_ = ensure_p2p_running_result;
+  }
+
+  void SetEnsureP2PNotRunningResult(bool ensure_p2p_not_running_result) {
+    ensure_p2p_not_running_result_ = ensure_p2p_not_running_result;
+  }
+
+  void SetPerformHousekeepingResult(bool perform_housekeeping_result) {
+    perform_housekeeping_result_ = perform_housekeeping_result;
+  }
+
+  void SetCountSharedFilesResult(int count_shared_files_result) {
+    count_shared_files_result_ = count_shared_files_result;
+  }
+
+  void SetLookupUrlForFileResult(const std::string& url) {
+    lookup_url_for_file_result_ = url;
+  }
+
+private:
+  bool is_p2p_enabled_;
+  bool ensure_p2p_running_result_;
+  bool ensure_p2p_not_running_result_;
+  bool perform_housekeeping_result_;
+  int count_shared_files_result_;
+  std::string lookup_url_for_file_result_;
+
+  DISALLOW_COPY_AND_ASSIGN(FakeP2PManager);
+};
+
+}  // namespace chromeos_update_engine
+
+#endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_FAKE_P2P_MANAGER_H__