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// Copyright (c) 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 "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "net/quic/congestion_control/available_channel_estimator.h"
#include "net/quic/test_tools/mock_clock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace net {
namespace test {
class AvailableChannelEstimatorTest : public ::testing::Test {
protected:
virtual void SetUp() {
srand(1234);
packet_size_ = 1200;
sequence_number_ = 1;
QuicTime receive_time = receive_clock_.Now();
QuicTime sent_time = send_clock_.Now();
estimator_.reset(new AvailableChannelEstimator(sequence_number_,
sent_time,
receive_time));
}
MockClock send_clock_;
MockClock receive_clock_;
QuicPacketSequenceNumber sequence_number_;
QuicByteCount packet_size_;
scoped_ptr<AvailableChannelEstimator> estimator_;
};
TEST_F(AvailableChannelEstimatorTest, SimpleBasic) {
QuicBandwidth bandwidth = QuicBandwidth::Zero();
QuicTime::Delta received_delta = QuicTime::Delta::FromMilliseconds(10);
QuicTime::Delta send_delta = QuicTime::Delta::FromMilliseconds(1);
receive_clock_.AdvanceTime(received_delta);
send_clock_.AdvanceTime(send_delta);
QuicTime receive_time = receive_clock_.Now();
QuicTime sent_time = send_clock_.Now();
estimator_->OnIncomingFeedback(++sequence_number_,
packet_size_,
sent_time,
receive_time);
EXPECT_EQ(kAvailableChannelEstimateUnknown,
estimator_->GetAvailableChannelEstimate(&bandwidth));
receive_clock_.AdvanceTime(received_delta);
receive_time = receive_clock_.Now();
send_clock_.AdvanceTime(send_delta);
sent_time = send_clock_.Now();
estimator_->OnIncomingFeedback(++sequence_number_,
packet_size_,
sent_time,
receive_time);
EXPECT_EQ(kAvailableChannelEstimateUncertain,
estimator_->GetAvailableChannelEstimate(&bandwidth));
EXPECT_EQ(QuicBandwidth::FromBytesAndTimeDelta(packet_size_, received_delta),
bandwidth);
}
// TODO(pwestin): simulate cross traffic.
TEST_F(AvailableChannelEstimatorTest, SimpleUncertainEstimate) {
QuicTime::Delta received_delta = QuicTime::Delta::FromMilliseconds(10);
QuicTime::Delta send_delta = QuicTime::Delta::FromMilliseconds(1);
for (int i = 0; i < 8; ++i) {
receive_clock_.AdvanceTime(received_delta);
QuicTime receive_time = receive_clock_.Now();
send_clock_.AdvanceTime(send_delta);
QuicTime sent_time = send_clock_.Now();
estimator_->OnIncomingFeedback(++sequence_number_,
packet_size_,
sent_time,
receive_time);
}
QuicBandwidth bandwidth = QuicBandwidth::Zero();
EXPECT_EQ(kAvailableChannelEstimateUncertain,
estimator_->GetAvailableChannelEstimate(&bandwidth));
EXPECT_EQ(QuicBandwidth::FromBytesAndTimeDelta(packet_size_, received_delta),
bandwidth);
}
TEST_F(AvailableChannelEstimatorTest, SimpleGoodEstimate) {
QuicTime::Delta received_delta = QuicTime::Delta::FromMilliseconds(10);
QuicTime::Delta send_delta = QuicTime::Delta::FromMilliseconds(1);
for (int i = 0; i < 100; ++i) {
receive_clock_.AdvanceTime(received_delta);
QuicTime receive_time = receive_clock_.Now();
send_clock_.AdvanceTime(send_delta);
QuicTime sent_time = send_clock_.Now();
estimator_->OnIncomingFeedback(++sequence_number_,
packet_size_,
sent_time,
receive_time);
}
QuicBandwidth bandwidth = QuicBandwidth::Zero();
EXPECT_EQ(kAvailableChannelEstimateGood,
estimator_->GetAvailableChannelEstimate(&bandwidth));
EXPECT_EQ(QuicBandwidth::FromBytesAndTimeDelta(packet_size_, received_delta),
bandwidth);
}
} // namespace test
} // namespace net
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