Change the number of emulated connections in QUIC's congestion control

net/quic/quic_sent_packet_manager_test.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/quic_sent_packet_manager.h"
 
 #include "base/stl_util.h"
 #include "net/quic/quic_flags.h"
 #include "net/quic/test_tools/quic_config_peer.h"
 #include "net/quic/test_tools/quic_sent_packet_manager_peer.h"
@@ skipping 1337 matching lines @@
   QuicConfig client_config;
   client_config.SetConnectionOptionsToSend(options);
   EXPECT_CALL(*network_change_visitor_, OnCongestionWindowChange(_));
   EXPECT_CALL(*send_algorithm_, SetNumEmulatedConnections(1));
   EXPECT_CALL(*send_algorithm_, GetCongestionWindow())
       .WillOnce(Return(100 * kDefaultTCPMSS));
   EXPECT_CALL(*send_algorithm_, SetFromConfig(_, _));
   manager_.SetFromConfig(client_config);
 }
 
+TEST_F(QuicSentPacketManagerTest, NegotiateNConnectionFromOptions) {
+  // By default, changing the number of open streams does nothing.
+  manager_.SetNumOpenStreams(5);
+
+  QuicConfig config;
+  QuicTagVector options;
+
+  options.push_back(kNCON);
+  QuicConfigPeer::SetReceivedConnectionOptions(&config, options);
+  EXPECT_CALL(*network_change_visitor_, OnCongestionWindowChange(_));
+  EXPECT_CALL(*send_algorithm_, GetCongestionWindow())
+      .WillOnce(Return(100 * kDefaultTCPMSS));
+  EXPECT_CALL(*send_algorithm_, SetFromConfig(_, _));
+  manager_.SetFromConfig(config);
+
+  EXPECT_CALL(*send_algorithm_, SetNumEmulatedConnections(5));
+  manager_.SetNumOpenStreams(5);
+}
+
 TEST_F(QuicSentPacketManagerTest, NegotiateNoTLPFromOptionsAtServer) {
   QuicConfig config;
   QuicTagVector options;
 
   options.push_back(kNTLP);
   QuicConfigPeer::SetReceivedConnectionOptions(&config, options);
   EXPECT_CALL(*network_change_visitor_, OnCongestionWindowChange(_));
   EXPECT_CALL(*send_algorithm_, GetCongestionWindow())
       .WillOnce(Return(100 * kDefaultTCPMSS));
   EXPECT_CALL(*send_algorithm_, SetFromConfig(_, _));
@@ skipping 78 matching lines @@
       .WillOnce(Return(100 * kDefaultTCPMSS));
   manager_.SetFromConfig(config);
 
   EXPECT_EQ(initial_rtt_us,
             manager_.GetRttStats()->SmoothedRtt().ToMicroseconds());
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace net