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diff --git a/third_party/libwebrtc/net/dcsctp/socket/mock_context.h b/third_party/libwebrtc/net/dcsctp/socket/mock_context.h
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index 0000000000..88e71d1b35
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+++ b/third_party/libwebrtc/net/dcsctp/socket/mock_context.h
@@ -0,0 +1,72 @@
+/*
+ *  Copyright (c) 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 NET_DCSCTP_SOCKET_MOCK_CONTEXT_H_
+#define NET_DCSCTP_SOCKET_MOCK_CONTEXT_H_
+
+#include <cstdint>
+
+#include "absl/strings/string_view.h"
+#include "absl/types/optional.h"
+#include "net/dcsctp/packet/sctp_packet.h"
+#include "net/dcsctp/public/dcsctp_options.h"
+#include "net/dcsctp/public/dcsctp_socket.h"
+#include "net/dcsctp/socket/context.h"
+#include "net/dcsctp/socket/mock_dcsctp_socket_callbacks.h"
+#include "test/gmock.h"
+
+namespace dcsctp {
+
+class MockContext : public Context {
+ public:
+  static constexpr TSN MyInitialTsn() { return TSN(990); }
+  static constexpr TSN PeerInitialTsn() { return TSN(10); }
+  static constexpr VerificationTag PeerVerificationTag() {
+    return VerificationTag(0x01234567);
+  }
+
+  explicit MockContext(MockDcSctpSocketCallbacks* callbacks)
+      : callbacks_(*callbacks) {
+    ON_CALL(*this, is_connection_established)
+        .WillByDefault(testing::Return(true));
+    ON_CALL(*this, my_initial_tsn)
+        .WillByDefault(testing::Return(MyInitialTsn()));
+    ON_CALL(*this, peer_initial_tsn)
+        .WillByDefault(testing::Return(PeerInitialTsn()));
+    ON_CALL(*this, callbacks).WillByDefault(testing::ReturnRef(callbacks_));
+    ON_CALL(*this, current_rto).WillByDefault(testing::Return(DurationMs(123)));
+    ON_CALL(*this, Send).WillByDefault([this](SctpPacket::Builder& builder) {
+      callbacks_.SendPacketWithStatus(builder.Build());
+    });
+  }
+
+  MOCK_METHOD(bool, is_connection_established, (), (const, override));
+  MOCK_METHOD(TSN, my_initial_tsn, (), (const, override));
+  MOCK_METHOD(TSN, peer_initial_tsn, (), (const, override));
+  MOCK_METHOD(DcSctpSocketCallbacks&, callbacks, (), (const, override));
+
+  MOCK_METHOD(void, ObserveRTT, (DurationMs rtt_ms), (override));
+  MOCK_METHOD(DurationMs, current_rto, (), (const, override));
+  MOCK_METHOD(bool,
+              IncrementTxErrorCounter,
+              (absl::string_view reason),
+              (override));
+  MOCK_METHOD(void, ClearTxErrorCounter, (), (override));
+  MOCK_METHOD(bool, HasTooManyTxErrors, (), (const, override));
+  SctpPacket::Builder PacketBuilder() const override {
+    return SctpPacket::Builder(PeerVerificationTag(), options_);
+  }
+  MOCK_METHOD(void, Send, (SctpPacket::Builder & builder), (override));
+
+  DcSctpOptions options_;
+  MockDcSctpSocketCallbacks& callbacks_;
+};
+}  // namespace dcsctp
+
+#endif  // NET_DCSCTP_SOCKET_MOCK_CONTEXT_H_