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diff --git a/third_party/libwebrtc/p2p/base/test_stun_server.h b/third_party/libwebrtc/p2p/base/test_stun_server.h
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+++ b/third_party/libwebrtc/p2p/base/test_stun_server.h
@@ -0,0 +1,45 @@
+/*
+ *  Copyright 2008 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef P2P_BASE_TEST_STUN_SERVER_H_
+#define P2P_BASE_TEST_STUN_SERVER_H_
+
+#include "api/transport/stun.h"
+#include "p2p/base/stun_server.h"
+#include "rtc_base/async_udp_socket.h"
+#include "rtc_base/socket_address.h"
+#include "rtc_base/socket_server.h"
+
+namespace cricket {
+
+// A test STUN server. Useful for unit tests.
+class TestStunServer : StunServer {
+ public:
+  static TestStunServer* Create(rtc::SocketServer* ss,
+                                const rtc::SocketAddress& addr);
+
+  // Set a fake STUN address to return to the client.
+  void set_fake_stun_addr(const rtc::SocketAddress& addr) {
+    fake_stun_addr_ = addr;
+  }
+
+ private:
+  explicit TestStunServer(rtc::AsyncUDPSocket* socket) : StunServer(socket) {}
+
+  void OnBindingRequest(StunMessage* msg,
+                        const rtc::SocketAddress& remote_addr) override;
+
+ private:
+  rtc::SocketAddress fake_stun_addr_;
+};
+
+}  // namespace cricket
+
+#endif  // P2P_BASE_TEST_STUN_SERVER_H_