src/net/quic/congestion_control/available_channel_estimator_test.cc

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/logging.h"
   6 #include "base/memory/scoped_ptr.h"
   7 #include "net/quic/congestion_control/available_channel_estimator.h"
   8 #include "net/quic/test_tools/mock_clock.h"
   9 #include "testing/gtest/include/gtest/gtest.h"
  10
  11 namespace net {
  12 namespace test {
  13
  14 class AvailableChannelEstimatorTest : public ::testing::Test {
  15  protected:
  16   virtual void SetUp() {
  17     srand(1234);
  18     packet_size_ = 1200;
  19     sequence_number_ = 1;
  20     QuicTime receive_time = receive_clock_.Now();
  21     QuicTime sent_time = send_clock_.Now();
  22     estimator_.reset(new AvailableChannelEstimator(sequence_number_,
  23                                                    sent_time,
  24                                                    receive_time));
  25   }
  26
  27   MockClock send_clock_;
  28   MockClock receive_clock_;
  29   QuicPacketSequenceNumber sequence_number_;
  30   QuicByteCount packet_size_;
  31   scoped_ptr<AvailableChannelEstimator> estimator_;
  32 };
  33
  34 TEST_F(AvailableChannelEstimatorTest, SimpleBasic) {
  35   QuicBandwidth bandwidth = QuicBandwidth::Zero();
  36   QuicTime::Delta received_delta = QuicTime::Delta::FromMilliseconds(10);
  37   QuicTime::Delta send_delta = QuicTime::Delta::FromMilliseconds(1);
  38   receive_clock_.AdvanceTime(received_delta);
  39   send_clock_.AdvanceTime(send_delta);
  40   QuicTime receive_time = receive_clock_.Now();
  41   QuicTime sent_time = send_clock_.Now();
  42   estimator_->OnIncomingFeedback(++sequence_number_,
  43                                  packet_size_,
  44                                  sent_time,
  45                                  receive_time);
  46   EXPECT_EQ(kAvailableChannelEstimateUnknown,
  47             estimator_->GetAvailableChannelEstimate(&bandwidth));
  48
  49   receive_clock_.AdvanceTime(received_delta);
  50   receive_time = receive_clock_.Now();
  51   send_clock_.AdvanceTime(send_delta);
  52   sent_time = send_clock_.Now();
  53
  54   estimator_->OnIncomingFeedback(++sequence_number_,
  55                                  packet_size_,
  56                                  sent_time,
  57                                  receive_time);
  58   EXPECT_EQ(kAvailableChannelEstimateUncertain,
  59             estimator_->GetAvailableChannelEstimate(&bandwidth));
  60
  61   EXPECT_EQ(QuicBandwidth::FromBytesAndTimeDelta(packet_size_, received_delta),
  62             bandwidth);
  63 }
  64
  65 // TODO(pwestin): simulate cross traffic.
  66 TEST_F(AvailableChannelEstimatorTest, SimpleUncertainEstimate) {
  67   QuicTime::Delta received_delta = QuicTime::Delta::FromMilliseconds(10);
  68   QuicTime::Delta send_delta = QuicTime::Delta::FromMilliseconds(1);
  69
  70   for (int i = 0; i < 8; ++i) {
  71     receive_clock_.AdvanceTime(received_delta);
  72     QuicTime receive_time = receive_clock_.Now();
  73     send_clock_.AdvanceTime(send_delta);
  74     QuicTime sent_time = send_clock_.Now();
  75     estimator_->OnIncomingFeedback(++sequence_number_,
  76                                    packet_size_,
  77                                    sent_time,
  78                                    receive_time);
  79   }
  80   QuicBandwidth bandwidth = QuicBandwidth::Zero();
  81   EXPECT_EQ(kAvailableChannelEstimateUncertain,
  82             estimator_->GetAvailableChannelEstimate(&bandwidth));
  83   EXPECT_EQ(QuicBandwidth::FromBytesAndTimeDelta(packet_size_, received_delta),
  84             bandwidth);
  85 }
  86
  87 TEST_F(AvailableChannelEstimatorTest, SimpleGoodEstimate) {
  88   QuicTime::Delta received_delta = QuicTime::Delta::FromMilliseconds(10);
  89   QuicTime::Delta send_delta = QuicTime::Delta::FromMilliseconds(1);
  90
  91   for (int i = 0; i < 100; ++i) {
  92     receive_clock_.AdvanceTime(received_delta);
  93     QuicTime receive_time = receive_clock_.Now();
  94     send_clock_.AdvanceTime(send_delta);
  95     QuicTime sent_time = send_clock_.Now();
  96     estimator_->OnIncomingFeedback(++sequence_number_,
  97                                    packet_size_,
  98                                    sent_time,
  99                                    receive_time);
 100   }
 101   QuicBandwidth bandwidth = QuicBandwidth::Zero();
 102   EXPECT_EQ(kAvailableChannelEstimateGood,
 103             estimator_->GetAvailableChannelEstimate(&bandwidth));
 104   EXPECT_EQ(QuicBandwidth::FromBytesAndTimeDelta(packet_size_, received_delta),
 105             bandwidth);
 106 }
 107
 108 }  // namespace test
 109 }  // namespace net