Ignore the peer's receive buffer in QUIC and instead set the max CWND to 2000 packets. Protected b…

net/quic/congestion_control/tcp_cubic_sender_bytes_test.cc

 // Copyright (c) 2015 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/congestion_control/tcp_cubic_sender_bytes.h"
 
 #include <algorithm>
 #include <cstdint>
 #include <memory>
 
@@ skipping 793 matching lines @@
   EXPECT_EQ(expected_send_window, sender_->GetSlowStartThreshold());
 
   // Resets cwnd and slow start threshold on connection migrations.
   sender_->OnConnectionMigration();
   EXPECT_EQ(kDefaultWindowTCP, sender_->GetCongestionWindow());
   EXPECT_EQ(kMaxCongestionWindowPackets * kDefaultTCPMSS,
             sender_->GetSlowStartThreshold());
   EXPECT_FALSE(sender_->hybrid_slow_start().started());
 }
 
+TEST_F(TcpCubicSenderBytesTest, DefaultMaxCwnd) {
+  ValueRestore<bool> old_flag(&FLAGS_quic_ignore_srbf, true);
+  RttStats rtt_stats;
+  QuicConnectionStats stats;
+  std::unique_ptr<SendAlgorithmInterface> sender(SendAlgorithmInterface::Create(
+      &clock_, &rtt_stats, kCubicBytes, &stats, kInitialCongestionWindow));
+
+  SendAlgorithmInterface::CongestionVector acked_packets;
+  SendAlgorithmInterface::CongestionVector missing_packets;
+  for (uint64_t i = 1; i < kDefaultMaxCongestionWindowPackets; ++i) {
+    acked_packets.clear();
+    acked_packets.push_back(std::make_pair(i, 1350));
+    sender->OnCongestionEvent(true, sender->GetCongestionWindow(),
+                              acked_packets, missing_packets);
+  }
+  EXPECT_EQ(kDefaultMaxCongestionWindowPackets,
+            sender->GetCongestionWindow() / kDefaultTCPMSS);
+}
+
 }  // namespace test
 }  // namespace net