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// Copyright (c) 2012 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.
//
// Test for FixRate sender and receiver.
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "net/quic/congestion_control/fix_rate_receiver.h"
#include "net/quic/congestion_control/fix_rate_sender.h"
#include "net/quic/test_tools/mock_clock.h"
#include "net/quic/quic_protocol.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace net {
namespace testing {
class FixRateTest : public ::testing::Test {
protected:
FixRateTest()
: rtt_(QuicTime::Delta::FromMilliseconds(30)) {
}
void SetUp() {
sender_.reset(new FixRateSender(&clock_));
receiver_.reset(new FixRateReceiver());
// Make sure clock does not start at 0.
clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(2));
}
const QuicTime::Delta rtt_;
MockClock clock_;
scoped_ptr<FixRateSender> sender_;
scoped_ptr<FixRateReceiver> receiver_;
};
TEST_F(FixRateTest, ReceiverAPI) {
CongestionInfo info;
QuicTime timestamp;
receiver_->SetBitrate(300000); // Bytes per second.
receiver_->RecordIncomingPacket(1, 1, timestamp, false);
ASSERT_TRUE(receiver_->GenerateCongestionInfo(&info));
EXPECT_EQ(kFixRate, info.type);
EXPECT_EQ(300000u, info.fix_rate.bitrate_in_bytes_per_second);
}
TEST_F(FixRateTest, SenderAPI) {
CongestionInfo info;
info.type = kFixRate;
info.fix_rate.bitrate_in_bytes_per_second = 300000;
sender_->OnIncomingCongestionInfo(info);
EXPECT_EQ(300000, sender_->BandwidthEstimate());
EXPECT_TRUE(sender_->TimeUntilSend(false).IsZero());
EXPECT_EQ(kMaxPacketSize * 2u, sender_->AvailableCongestionWindow());
sender_->SentPacket(1, kMaxPacketSize, false);
EXPECT_EQ(3000u - kMaxPacketSize, sender_->AvailableCongestionWindow());
EXPECT_TRUE(sender_->TimeUntilSend(false).IsZero());
sender_->SentPacket(2, kMaxPacketSize, false);
sender_->SentPacket(3, 600, false);
EXPECT_EQ(QuicTime::Delta::FromMilliseconds(10),
sender_->TimeUntilSend(false));
EXPECT_EQ(0u, sender_->AvailableCongestionWindow());
clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(2));
EXPECT_EQ(QuicTime::Delta::Infinite(), sender_->TimeUntilSend(false));
clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(8));
sender_->OnIncomingAck(1, kMaxPacketSize, rtt_);
sender_->OnIncomingAck(2, kMaxPacketSize, rtt_);
sender_->OnIncomingAck(3, 600, rtt_);
EXPECT_TRUE(sender_->TimeUntilSend(false).IsZero());
}
TEST_F(FixRateTest, FixRatePacing) {
const uint64 packet_size = 1200;
const uint64 bit_rate = 240000;
const uint64 num_packets = 200;
CongestionInfo info;
receiver_->SetBitrate(240000); // Bytes per second.
ASSERT_TRUE(receiver_->GenerateCongestionInfo(&info));
sender_->OnIncomingCongestionInfo(info);
QuicTime acc_advance_time;
QuicPacketSequenceNumber sequence_number = 0;
for (size_t i = 0; i < num_packets; i += 2) {
EXPECT_TRUE(sender_->TimeUntilSend(false).IsZero());
EXPECT_EQ(kMaxPacketSize * 2, sender_->AvailableCongestionWindow());
sender_->SentPacket(sequence_number++, packet_size, false);
EXPECT_TRUE(sender_->TimeUntilSend(false).IsZero());
sender_->SentPacket(sequence_number++, packet_size, false);
QuicTime::Delta advance_time = sender_->TimeUntilSend(false);
clock_.AdvanceTime(advance_time);
sender_->OnIncomingAck(sequence_number - 1, packet_size, rtt_);
sender_->OnIncomingAck(sequence_number - 2, packet_size, rtt_);
acc_advance_time = acc_advance_time.Add(advance_time);
}
EXPECT_EQ(num_packets * packet_size * 1000000 / bit_rate,
acc_advance_time.ToMicroseconds());
}
} // namespace testing
} // namespace net
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