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/*
* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "modules/congestion_controller/pcc/rtt_tracker.h"
#include "api/transport/network_types.h"
#include "api/units/time_delta.h"
#include "api/units/timestamp.h"
#include "test/gtest.h"
namespace webrtc {
namespace pcc {
namespace test {
namespace {
const TimeDelta kInitialRtt = TimeDelta::Micros(10);
constexpr double kAlpha = 0.9;
const Timestamp kStartTime = Timestamp::Seconds(0);
PacketResult GetPacketWithRtt(TimeDelta rtt) {
SentPacket packet;
packet.send_time = kStartTime;
PacketResult packet_result;
packet_result.sent_packet = packet;
if (rtt.IsFinite()) {
packet_result.receive_time = kStartTime + rtt;
} else {
packet_result.receive_time = Timestamp::PlusInfinity();
}
return packet_result;
}
} // namespace
TEST(PccRttTrackerTest, InitialValue) {
RttTracker tracker{kInitialRtt, kAlpha};
EXPECT_EQ(kInitialRtt, tracker.GetRtt());
for (int i = 0; i < 100; ++i) {
tracker.OnPacketsFeedback({GetPacketWithRtt(kInitialRtt)},
kStartTime + kInitialRtt);
}
EXPECT_EQ(kInitialRtt, tracker.GetRtt());
}
TEST(PccRttTrackerTest, DoNothingWhenPacketIsLost) {
RttTracker tracker{kInitialRtt, kAlpha};
tracker.OnPacketsFeedback({GetPacketWithRtt(TimeDelta::PlusInfinity())},
kStartTime + kInitialRtt);
EXPECT_EQ(tracker.GetRtt(), kInitialRtt);
}
TEST(PccRttTrackerTest, ChangeInRtt) {
RttTracker tracker{kInitialRtt, kAlpha};
const TimeDelta kNewRtt = TimeDelta::Micros(100);
tracker.OnPacketsFeedback({GetPacketWithRtt(kNewRtt)}, kStartTime + kNewRtt);
EXPECT_GT(tracker.GetRtt(), kInitialRtt);
EXPECT_LE(tracker.GetRtt(), kNewRtt);
for (int i = 0; i < 100; ++i) {
tracker.OnPacketsFeedback({GetPacketWithRtt(kNewRtt)},
kStartTime + kNewRtt);
}
const TimeDelta absolute_error = TimeDelta::Micros(1);
EXPECT_NEAR(tracker.GetRtt().us(), kNewRtt.us(), absolute_error.us());
EXPECT_LE(tracker.GetRtt(), kNewRtt);
}
} // namespace test
} // namespace pcc
} // namespace webrtc
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