Set actual transport overhead in rtp_rtcp

webrtc/pc/channel_unittest.cc

 /*
  *  Copyright 2009 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.
  */
 
@@ skipping 944 matching lines @@
       transport_channel1->SignalSelectedCandidatePairChanged(
           transport_channel1, candidate_pair.get(), kLastPacketId, true);
     });
     WaitForThreads();
     EXPECT_EQ(1, media_channel1->num_network_route_changes());
     rtc::NetworkRoute expected_network_route(true, kLocalNetId, kRemoteNetId,
                                              kLastPacketId);
     EXPECT_EQ(expected_network_route, media_channel1->last_network_route());
     EXPECT_EQ(kLastPacketId,
               media_channel1->last_network_route().last_sent_packet_id);
+    constexpr int kTransportOverheadPerPacket = 28;  // Ipv4(20) + UDP(8).
+    EXPECT_EQ(kTransportOverheadPerPacket,
+              media_channel1->transport_overhead_per_packet());
   }
 
   // Test setting up a call.
   void TestCallSetup() {
     CreateChannels(0, 0);
     EXPECT_FALSE(channel1_->secure());
     EXPECT_TRUE(SendInitiate());
     if (verify_playout_) {
       EXPECT_TRUE(media_channel1_->playout());
     }
@@ skipping 2700 matching lines @@
   };
   rtc::CopyOnWriteBuffer payload(data, 3);
   cricket::SendDataResult result;
   ASSERT_TRUE(media_channel1_->SendData(params, payload, &result));
   EXPECT_EQ(params.ssrc,
             media_channel1_->last_sent_data_params().ssrc);
   EXPECT_EQ("foo", media_channel1_->last_sent_data());
 }
 
 // TODO(pthatcher): TestSetReceiver?