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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.
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "net/quic/congestion_control/paced_sender.h"
#include "net/quic/quic_protocol.h"
#include "net/quic/test_tools/mock_clock.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace net {
namespace test {
const int kHundredKBytesPerS = 100000;
class PacedSenderTest : public ::testing::Test {
protected:
PacedSenderTest()
: zero_time_(QuicTime::Delta::Zero()),
paced_sender_(new PacedSender(&clock_, kHundredKBytesPerS)) {
}
const QuicTime::Delta zero_time_;
MockClock clock_;
scoped_ptr<PacedSender> paced_sender_;
};
TEST_F(PacedSenderTest, Basic) {
paced_sender_->UpdateBandwidthEstimate(kHundredKBytesPerS * 10);
EXPECT_TRUE(paced_sender_->TimeUntilSend(zero_time_).IsZero());
EXPECT_EQ(kMaxPacketSize * 2,
paced_sender_->AvailableWindow(kMaxPacketSize * 4));
paced_sender_->SentPacket(kMaxPacketSize);
EXPECT_TRUE(paced_sender_->TimeUntilSend(zero_time_).IsZero());
paced_sender_->SentPacket(kMaxPacketSize);
EXPECT_EQ(static_cast<int64>(kMaxPacketSize * 2),
paced_sender_->TimeUntilSend(zero_time_).ToMicroseconds());
EXPECT_EQ(0u, paced_sender_->AvailableWindow(kMaxPacketSize * 4));
clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(24));
EXPECT_TRUE(paced_sender_->TimeUntilSend(zero_time_).IsZero());
EXPECT_EQ(kMaxPacketSize * 2,
paced_sender_->AvailableWindow(kMaxPacketSize * 4));
}
TEST_F(PacedSenderTest, LowRate) {
paced_sender_->UpdateBandwidthEstimate(kHundredKBytesPerS);
EXPECT_TRUE(paced_sender_->TimeUntilSend(zero_time_).IsZero());
size_t window = paced_sender_->AvailableWindow(kMaxPacketSize * 4);
EXPECT_EQ(kMaxPacketSize * 2, window);
paced_sender_->SentPacket(kMaxPacketSize);
EXPECT_TRUE(paced_sender_->TimeUntilSend(zero_time_).IsZero());
paced_sender_->SentPacket(kMaxPacketSize);
EXPECT_EQ(static_cast<int64>(kMaxPacketSize * 20),
paced_sender_->TimeUntilSend(zero_time_).ToMicroseconds());
EXPECT_EQ(0u, paced_sender_->AvailableWindow(kMaxPacketSize * 4));
clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(24));
EXPECT_TRUE(paced_sender_->TimeUntilSend(zero_time_).IsZero());
EXPECT_EQ(kMaxPacketSize * 2,
paced_sender_->AvailableWindow(kMaxPacketSize * 4));
}
TEST_F(PacedSenderTest, HighRate) {
int bandwidth_estimate = kHundredKBytesPerS * 100;
paced_sender_->UpdateBandwidthEstimate(bandwidth_estimate);
EXPECT_TRUE(paced_sender_->TimeUntilSend(zero_time_).IsZero());
EXPECT_EQ(bandwidth_estimate / 500u,
paced_sender_->AvailableWindow(kMaxPacketSize * 100));
for (int i = 0; i < 16; ++i) {
paced_sender_->SentPacket(kMaxPacketSize);
EXPECT_TRUE(paced_sender_->TimeUntilSend(zero_time_).IsZero());
}
paced_sender_->SentPacket(kMaxPacketSize);
EXPECT_EQ(0u, paced_sender_->AvailableWindow(kMaxPacketSize * 100));
EXPECT_EQ(2040, paced_sender_->TimeUntilSend(zero_time_).ToMicroseconds());
clock_.AdvanceTime(QuicTime::Delta::FromMicroseconds(20400));
EXPECT_TRUE(paced_sender_->TimeUntilSend(zero_time_).IsZero());
EXPECT_EQ(bandwidth_estimate / 500u,
paced_sender_->AvailableWindow(kMaxPacketSize * 100));
}
} // namespace test
} // namespace net
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