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diff --git a/third_party/libwebrtc/api/test/mock_async_dns_resolver.h b/third_party/libwebrtc/api/test/mock_async_dns_resolver.h
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+++ b/third_party/libwebrtc/api/test/mock_async_dns_resolver.h
@@ -0,0 +1,62 @@
+/*
+ *  Copyright 2021 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 API_TEST_MOCK_ASYNC_DNS_RESOLVER_H_
+#define API_TEST_MOCK_ASYNC_DNS_RESOLVER_H_
+
+#include <functional>
+#include <memory>
+
+#include "api/async_dns_resolver.h"
+#include "test/gmock.h"
+
+namespace webrtc {
+
+class MockAsyncDnsResolverResult : public AsyncDnsResolverResult {
+ public:
+  MOCK_METHOD(bool,
+              GetResolvedAddress,
+              (int, rtc::SocketAddress*),
+              (const, override));
+  MOCK_METHOD(int, GetError, (), (const, override));
+};
+
+class MockAsyncDnsResolver : public AsyncDnsResolverInterface {
+ public:
+  MOCK_METHOD(void,
+              Start,
+              (const rtc::SocketAddress&, std::function<void()>),
+              (override));
+  MOCK_METHOD(void,
+              Start,
+              (const rtc::SocketAddress&, int family, std::function<void()>),
+              (override));
+  MOCK_METHOD(AsyncDnsResolverResult&, result, (), (const, override));
+};
+
+class MockAsyncDnsResolverFactory : public AsyncDnsResolverFactoryInterface {
+ public:
+  MOCK_METHOD(std::unique_ptr<webrtc::AsyncDnsResolverInterface>,
+              CreateAndResolve,
+              (const rtc::SocketAddress&, std::function<void()>),
+              (override));
+  MOCK_METHOD(std::unique_ptr<webrtc::AsyncDnsResolverInterface>,
+              CreateAndResolve,
+              (const rtc::SocketAddress&, int, std::function<void()>),
+              (override));
+  MOCK_METHOD(std::unique_ptr<webrtc::AsyncDnsResolverInterface>,
+              Create,
+              (),
+              (override));
+};
+
+}  // namespace webrtc
+
+#endif  // API_TEST_MOCK_ASYNC_DNS_RESOLVER_H_