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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/basictypes.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "net/quic/congestion_control/inter_arrival_state_machine.h"
#include "net/quic/test_tools/mock_clock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace net {
namespace test {
class InterArrivalStateMachineTest : public ::testing::Test {
protected:
InterArrivalStateMachineTest() {
}
virtual void SetUp() {
state_machine_.reset(new InterArrivalStateMachine(&clock_));
}
MockClock clock_;
scoped_ptr<InterArrivalStateMachine> state_machine_;
};
TEST_F(InterArrivalStateMachineTest, SimplePacketLoss) {
QuicTime::Delta rtt = QuicTime::Delta::FromMilliseconds(100);
state_machine_->set_rtt(rtt);
state_machine_->IncreaseBitrateDecision();
clock_.AdvanceTime(rtt);
state_machine_->PacketLossEvent();
state_machine_->DecreaseBitrateDecision();
EXPECT_EQ(kInterArrivalStateStable,
state_machine_->GetInterArrivalState());
// Make sure we switch to state packet loss.
clock_.AdvanceTime(rtt);
state_machine_->PacketLossEvent();
state_machine_->DecreaseBitrateDecision();
EXPECT_EQ(kInterArrivalStatePacketLoss,
state_machine_->GetInterArrivalState());
// Make sure we stay in state packet loss.
clock_.AdvanceTime(rtt);
state_machine_->PacketLossEvent();
state_machine_->DecreaseBitrateDecision();
EXPECT_EQ(kInterArrivalStatePacketLoss,
state_machine_->GetInterArrivalState());
clock_.AdvanceTime(rtt);
state_machine_->PacketLossEvent();
state_machine_->DecreaseBitrateDecision();
EXPECT_EQ(kInterArrivalStatePacketLoss,
state_machine_->GetInterArrivalState());
}
TEST_F(InterArrivalStateMachineTest, SimpleDelay) {
QuicTime::Delta rtt = QuicTime::Delta::FromMilliseconds(100);
state_machine_->set_rtt(rtt);
state_machine_->IncreaseBitrateDecision();
clock_.AdvanceTime(rtt);
state_machine_->IncreasingDelayEvent();
state_machine_->DecreaseBitrateDecision();
EXPECT_EQ(kInterArrivalStateStable,
state_machine_->GetInterArrivalState());
// Make sure we switch to state delay.
clock_.AdvanceTime(rtt);
state_machine_->IncreasingDelayEvent();
state_machine_->DecreaseBitrateDecision();
EXPECT_EQ(kInterArrivalStateDelay,
state_machine_->GetInterArrivalState());
clock_.AdvanceTime(rtt);
state_machine_->IncreasingDelayEvent();
state_machine_->DecreaseBitrateDecision();
EXPECT_EQ(kInterArrivalStateDelay,
state_machine_->GetInterArrivalState());
// Make sure we switch to state competing flow(s).
clock_.AdvanceTime(rtt);
state_machine_->IncreasingDelayEvent();
state_machine_->DecreaseBitrateDecision();
EXPECT_EQ(kInterArrivalStateCompetingFlow,
state_machine_->GetInterArrivalState());
// Make sure we stay in state competing flow(s).
clock_.AdvanceTime(rtt);
state_machine_->IncreasingDelayEvent();
state_machine_->DecreaseBitrateDecision();
EXPECT_EQ(kInterArrivalStateCompetingFlow,
state_machine_->GetInterArrivalState());
clock_.AdvanceTime(rtt);
state_machine_->PacketLossEvent();
state_machine_->DecreaseBitrateDecision();
EXPECT_EQ(kInterArrivalStateCompetingFlow,
state_machine_->GetInterArrivalState());
clock_.AdvanceTime(rtt);
state_machine_->PacketLossEvent();
state_machine_->DecreaseBitrateDecision();
EXPECT_EQ(kInterArrivalStateCompetingFlow,
state_machine_->GetInterArrivalState());
// Make sure we switch to state competing TCP flow(s).
clock_.AdvanceTime(rtt);
state_machine_->PacketLossEvent();
state_machine_->DecreaseBitrateDecision();
EXPECT_EQ(kInterArrivalStateCompetingTcpFLow,
state_machine_->GetInterArrivalState());
// Make sure we stay in state competing TCP flow(s).
clock_.AdvanceTime(rtt);
state_machine_->PacketLossEvent();
state_machine_->DecreaseBitrateDecision();
EXPECT_EQ(kInterArrivalStateCompetingTcpFLow,
state_machine_->GetInterArrivalState());
}
} // namespace test
} // namespace net
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