chromium/net/third_party/quiche/src/quiche/quic/core/congestion_control/cubic_bytes_test.cc

// Copyright (c) 2015 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 "quiche/quic/core/congestion_control/cubic_bytes.h"

#include <cmath>
#include <cstdint>

#include "quiche/quic/platform/api/quic_flags.h"
#include "quiche/quic/platform/api/quic_test.h"
#include "quiche/quic/test_tools/mock_clock.h"

namespace quic {
namespace test {
namespace {

const float kBeta = …;          // Default Cubic backoff factor.
const float kBetaLastMax = …;  // Default Cubic backoff factor.
const uint32_t kNumConnections = …;
const float kNConnectionBeta = …;
const float kNConnectionBetaLastMax = …;
const float kNConnectionAlpha = …;

}  // namespace

class CubicBytesTest : public QuicTest { … };

// TODO(jokulik): The original "AboveOrigin" test, below, is very
// loose.  It's nearly impossible to make the test tighter without
// deploying the fix for convex mode.  Once cubic convex is deployed,
// replace "AboveOrigin" with this test.
TEST_F(CubicBytesTest, AboveOriginWithTighterBounds) { … }

// TODO(ianswett): This test was disabled when all fixes were enabled, but it
// may be worth fixing.
TEST_F(CubicBytesTest, DISABLED_AboveOrigin) { … }

// Constructs an artificial scenario to ensure that cubic-convex
// increases are truly fine-grained:
//
// - After starting the epoch, this test advances the elapsed time
// sufficiently far that cubic will do small increases at less than
// MaxCubicTimeInterval() intervals.
//
// - Sets an artificially large initial cwnd to prevent Reno from the
// convex increases on every ack.
TEST_F(CubicBytesTest, AboveOriginFineGrainedCubing) { … }

// Constructs an artificial scenario to show what happens when we
// allow per-ack updates, rather than limititing update freqency.  In
// this scenario, the first two acks of the epoch produce the same
// cwnd.  When we limit per-ack updates, this would cause the
// cessation of cubic updates for 30ms.  When we allow per-ack
// updates, the window continues to grow on every ack.
TEST_F(CubicBytesTest, PerAckUpdates) { … }

TEST_F(CubicBytesTest, LossEvents) { … }

TEST_F(CubicBytesTest, BelowOrigin) { … }

}  // namespace test
}  // namespace quic