Move shared files in net/quic/ into net/quic/core/

net/quic/congestion_control/windowed_filter_test.cc

Index: net/quic/congestion_control/windowed_filter_test.cc
diff --git a/net/quic/congestion_control/windowed_filter_test.cc b/net/quic/congestion_control/windowed_filter_test.cc
deleted file mode 100644
index c6bf279f3ce32faaceb4e39a77a39ec844289c59..0000000000000000000000000000000000000000
--- a/net/quic/congestion_control/windowed_filter_test.cc
+++ /dev/null
@@ -1,392 +0,0 @@
-// Copyright (c) 2016 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 "net/quic/congestion_control/windowed_filter.h"
-
-#include "base/logging.h"
-#include "net/quic/congestion_control/rtt_stats.h"
-#include "net/quic/quic_bandwidth.h"
-#include "net/quic/quic_protocol.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace net {
-namespace test {
-namespace {
-
-class WindowedFilterTest : public ::testing::Test {
- public:
-  // Set the window to 99ms, so 25ms is more than a quarter rtt.
-  WindowedFilterTest()
-      : windowed_min_rtt_(QuicTime::Delta::FromMilliseconds(99),
-                          QuicTime::Delta::Zero(),
-                          QuicTime::Zero()),
-        windowed_max_bw_(QuicTime::Delta::FromMilliseconds(99),
-                         QuicBandwidth::Zero(),
-                         QuicTime::Zero()) {}
-
-  // Sets up windowed_min_rtt_ to have the following values:
-  // Best = 20ms, recorded at 25ms
-  // Second best = 40ms, recorded at 75ms
-  // Third best = 50ms, recorded at 100ms
-  void InitializeMinFilter() {
-    QuicTime now = QuicTime::Zero();
-    QuicTime::Delta rtt_sample = QuicTime::Delta::FromMilliseconds(10);
-    for (int i = 0; i < 5; ++i) {
-      windowed_min_rtt_.Update(rtt_sample, now);
-      VLOG(1) << "i: " << i << " sample: " << rtt_sample.ToMilliseconds()
-              << " mins: "
-              << " " << windowed_min_rtt_.GetBest().ToMilliseconds() << " "
-              << windowed_min_rtt_.GetSecondBest().ToMilliseconds() << " "
-              << windowed_min_rtt_.GetThirdBest().ToMilliseconds();
-      now = now + QuicTime::Delta::FromMilliseconds(25);
-      rtt_sample = rtt_sample + QuicTime::Delta::FromMilliseconds(10);
-    }
-    EXPECT_EQ(QuicTime::Delta::FromMilliseconds(20),
-              windowed_min_rtt_.GetBest());
-    EXPECT_EQ(QuicTime::Delta::FromMilliseconds(40),
-              windowed_min_rtt_.GetSecondBest());
-    EXPECT_EQ(QuicTime::Delta::FromMilliseconds(50),
-              windowed_min_rtt_.GetThirdBest());
-  }
-
-  // Sets up windowed_max_bw_ to have the following values:
-  // Best = 900 bps, recorded at 25ms
-  // Second best = 700 bps, recorded at 75ms
-  // Third best = 600 bps, recorded at 100ms
-  void InitializeMaxFilter() {
-    QuicTime now = QuicTime::Zero();
-    QuicBandwidth bw_sample = QuicBandwidth::FromBitsPerSecond(1000);
-    for (int i = 0; i < 5; ++i) {
-      windowed_max_bw_.Update(bw_sample, now);
-      VLOG(1) << "i: " << i << " sample: " << bw_sample.ToBitsPerSecond()
-              << " maxs: "
-              << " " << windowed_max_bw_.GetBest().ToBitsPerSecond() << " "
-              << windowed_max_bw_.GetSecondBest().ToBitsPerSecond() << " "
-              << windowed_max_bw_.GetThirdBest().ToBitsPerSecond();
-      now = now + QuicTime::Delta::FromMilliseconds(25);
-      bw_sample = bw_sample - QuicBandwidth::FromBitsPerSecond(100);
-    }
-    EXPECT_EQ(QuicBandwidth::FromBitsPerSecond(900),
-              windowed_max_bw_.GetBest());
-    EXPECT_EQ(QuicBandwidth::FromBitsPerSecond(700),
-              windowed_max_bw_.GetSecondBest());
-    EXPECT_EQ(QuicBandwidth::FromBitsPerSecond(600),
-              windowed_max_bw_.GetThirdBest());
-  }
-
- protected:
-  WindowedFilter<QuicTime::Delta,
-                 MinFilter<QuicTime::Delta>,
-                 QuicTime,
-                 QuicTime::Delta>
-      windowed_min_rtt_;
-  WindowedFilter<QuicBandwidth,
-                 MaxFilter<QuicBandwidth>,
-                 QuicTime,
-                 QuicTime::Delta>
-      windowed_max_bw_;
-};
-
-namespace {
-// Test helper function: updates the filter with a lot of small values in order
-// to ensure that it is not susceptible to noise.
-void UpdateWithIrrelevantSamples(
-    WindowedFilter<uint64_t, MaxFilter<uint64_t>, uint64_t, uint64_t>* filter,
-    uint64_t max_value,
-    uint64_t time) {
-  for (uint64_t i = 0; i < 1000; i++) {
-    filter->Update(i % max_value, time);
-  }
-}
-}  // namespace
-
-TEST_F(WindowedFilterTest, UninitializedEstimates) {
-  EXPECT_EQ(QuicTime::Delta::Zero(), windowed_min_rtt_.GetBest());
-  EXPECT_EQ(QuicTime::Delta::Zero(), windowed_min_rtt_.GetSecondBest());
-  EXPECT_EQ(QuicTime::Delta::Zero(), windowed_min_rtt_.GetThirdBest());
-  EXPECT_EQ(QuicBandwidth::Zero(), windowed_max_bw_.GetBest());
-  EXPECT_EQ(QuicBandwidth::Zero(), windowed_max_bw_.GetSecondBest());
-  EXPECT_EQ(QuicBandwidth::Zero(), windowed_max_bw_.GetThirdBest());
-}
-
-TEST_F(WindowedFilterTest, MonotonicallyIncreasingMin) {
-  QuicTime now = QuicTime::Zero();
-  QuicTime::Delta rtt_sample = QuicTime::Delta::FromMilliseconds(10);
-  windowed_min_rtt_.Update(rtt_sample, now);
-  EXPECT_EQ(QuicTime::Delta::FromMilliseconds(10), windowed_min_rtt_.GetBest());
-
-  // Gradually increase the rtt samples and ensure the windowed min rtt starts
-  // rising.
-  for (int i = 0; i < 6; ++i) {
-    now = now + QuicTime::Delta::FromMilliseconds(25);
-    rtt_sample = rtt_sample + QuicTime::Delta::FromMilliseconds(10);
-    windowed_min_rtt_.Update(rtt_sample, now);
-    VLOG(1) << "i: " << i << " sample: " << rtt_sample.ToMilliseconds()
-            << " mins: "
-            << " " << windowed_min_rtt_.GetBest().ToMilliseconds() << " "
-            << windowed_min_rtt_.GetSecondBest().ToMilliseconds() << " "
-            << windowed_min_rtt_.GetThirdBest().ToMilliseconds();
-    if (i < 3) {
-      EXPECT_EQ(QuicTime::Delta::FromMilliseconds(10),
-                windowed_min_rtt_.GetBest());
-    } else if (i == 3) {
-      EXPECT_EQ(QuicTime::Delta::FromMilliseconds(20),
-                windowed_min_rtt_.GetBest());
-    } else if (i < 6) {
-      EXPECT_EQ(QuicTime::Delta::FromMilliseconds(40),
-                windowed_min_rtt_.GetBest());
-    }
-  }
-}
-
-TEST_F(WindowedFilterTest, MonotonicallyDecreasingMax) {
-  QuicTime now = QuicTime::Zero();
-  QuicBandwidth bw_sample = QuicBandwidth::FromBitsPerSecond(1000);
-  windowed_max_bw_.Update(bw_sample, now);
-  EXPECT_EQ(QuicBandwidth::FromBitsPerSecond(1000), windowed_max_bw_.GetBest());
-
-  // Gradually decrease the bw samples and ensure the windowed max bw starts
-  // decreasing.
-  for (int i = 0; i < 6; ++i) {
-    now = now + QuicTime::Delta::FromMilliseconds(25);
-    bw_sample = bw_sample - QuicBandwidth::FromBitsPerSecond(100);
-    windowed_max_bw_.Update(bw_sample, now);
-    VLOG(1) << "i: " << i << " sample: " << bw_sample.ToBitsPerSecond()
-            << " maxs: "
-            << " " << windowed_max_bw_.GetBest().ToBitsPerSecond() << " "
-            << windowed_max_bw_.GetSecondBest().ToBitsPerSecond() << " "
-            << windowed_max_bw_.GetThirdBest().ToBitsPerSecond();
-    if (i < 3) {
-      EXPECT_EQ(QuicBandwidth::FromBitsPerSecond(1000),
-                windowed_max_bw_.GetBest());
-    } else if (i == 3) {
-      EXPECT_EQ(QuicBandwidth::FromBitsPerSecond(900),
-                windowed_max_bw_.GetBest());
-    } else if (i < 6) {
-      EXPECT_EQ(QuicBandwidth::FromBitsPerSecond(700),
-                windowed_max_bw_.GetBest());
-    }
-  }
-}
-
-TEST_F(WindowedFilterTest, SampleChangesThirdBestMin) {
-  InitializeMinFilter();
-  // RTT sample lower than the third-choice min-rtt sets that, but nothing else.
-  QuicTime::Delta rtt_sample =
-      windowed_min_rtt_.GetThirdBest() - QuicTime::Delta::FromMilliseconds(5);
-  // This assert is necessary to avoid triggering -Wstrict-overflow
-  // See crbug/616957
-  ASSERT_GT(windowed_min_rtt_.GetThirdBest(),
-            QuicTime::Delta::FromMilliseconds(5));
-  // Latest sample was recorded at 100ms.
-  QuicTime now = QuicTime::Zero() + QuicTime::Delta::FromMilliseconds(101);
-  windowed_min_rtt_.Update(rtt_sample, now);
-  windowed_min_rtt_.Update(rtt_sample, now);
-  EXPECT_EQ(rtt_sample, windowed_min_rtt_.GetThirdBest());
-  EXPECT_EQ(QuicTime::Delta::FromMilliseconds(40),
-            windowed_min_rtt_.GetSecondBest());
-  EXPECT_EQ(QuicTime::Delta::FromMilliseconds(20), windowed_min_rtt_.GetBest());
-}
-
-TEST_F(WindowedFilterTest, SampleChangesThirdBestMax) {
-  InitializeMaxFilter();
-  // BW sample higher than the third-choice max sets that, but nothing else.
-  QuicBandwidth bw_sample =
-      windowed_max_bw_.GetThirdBest() + QuicBandwidth::FromBitsPerSecond(50);
-  // Latest sample was recorded at 100ms.
-  QuicTime now = QuicTime::Zero() + QuicTime::Delta::FromMilliseconds(101);
-  windowed_max_bw_.Update(bw_sample, now);
-  EXPECT_EQ(bw_sample, windowed_max_bw_.GetThirdBest());
-  EXPECT_EQ(QuicBandwidth::FromBitsPerSecond(700),
-            windowed_max_bw_.GetSecondBest());
-  EXPECT_EQ(QuicBandwidth::FromBitsPerSecond(900), windowed_max_bw_.GetBest());
-}
-
-TEST_F(WindowedFilterTest, SampleChangesSecondBestMin) {
-  InitializeMinFilter();
-  // RTT sample lower than the second-choice min sets that and also
-  // the third-choice min.
-  QuicTime::Delta rtt_sample =
-      windowed_min_rtt_.GetSecondBest() - QuicTime::Delta::FromMilliseconds(5);
-  // This assert is necessary to avoid triggering -Wstrict-overflow
-  // See crbug/616957
-  ASSERT_GT(windowed_min_rtt_.GetSecondBest(),
-            QuicTime::Delta::FromMilliseconds(5));
-  // Latest sample was recorded at 100ms.
-  QuicTime now = QuicTime::Zero() + QuicTime::Delta::FromMilliseconds(101);
-  windowed_min_rtt_.Update(rtt_sample, now);
-  EXPECT_EQ(rtt_sample, windowed_min_rtt_.GetThirdBest());
-  EXPECT_EQ(rtt_sample, windowed_min_rtt_.GetSecondBest());
-  EXPECT_EQ(QuicTime::Delta::FromMilliseconds(20), windowed_min_rtt_.GetBest());
-}
-
-TEST_F(WindowedFilterTest, SampleChangesSecondBestMax) {
-  InitializeMaxFilter();
-  // BW sample higher than the second-choice max sets that and also
-  // the third-choice max.
-  QuicBandwidth bw_sample =
-      windowed_max_bw_.GetSecondBest() + QuicBandwidth::FromBitsPerSecond(50);
-  // Latest sample was recorded at 100ms.
-  QuicTime now = QuicTime::Zero() + QuicTime::Delta::FromMilliseconds(101);
-  windowed_max_bw_.Update(bw_sample, now);
-  EXPECT_EQ(bw_sample, windowed_max_bw_.GetThirdBest());
-  EXPECT_EQ(bw_sample, windowed_max_bw_.GetSecondBest());
-  EXPECT_EQ(QuicBandwidth::FromBitsPerSecond(900), windowed_max_bw_.GetBest());
-}
-
-TEST_F(WindowedFilterTest, SampleChangesAllMins) {
-  InitializeMinFilter();
-  // RTT sample lower than the first-choice min-rtt sets that and also
-  // the second and third-choice mins.
-  QuicTime::Delta rtt_sample =
-      windowed_min_rtt_.GetBest() - QuicTime::Delta::FromMilliseconds(5);
-  // This assert is necessary to avoid triggering -Wstrict-overflow
-  // See crbug/616957
-  ASSERT_GT(windowed_min_rtt_.GetBest(), QuicTime::Delta::FromMilliseconds(5));
-  // Latest sample was recorded at 100ms.
-  QuicTime now = QuicTime::Zero() + QuicTime::Delta::FromMilliseconds(101);
-  windowed_min_rtt_.Update(rtt_sample, now);
-  EXPECT_EQ(rtt_sample, windowed_min_rtt_.GetThirdBest());
-  EXPECT_EQ(rtt_sample, windowed_min_rtt_.GetSecondBest());
-  EXPECT_EQ(rtt_sample, windowed_min_rtt_.GetBest());
-}
-
-TEST_F(WindowedFilterTest, SampleChangesAllMaxs) {
-  InitializeMaxFilter();
-  // BW sample higher than the first-choice max sets that and also
-  // the second and third-choice maxs.
-  QuicBandwidth bw_sample =
-      windowed_max_bw_.GetBest() + QuicBandwidth::FromBitsPerSecond(50);
-  // Latest sample was recorded at 100ms.
-  QuicTime now = QuicTime::Zero() + QuicTime::Delta::FromMilliseconds(101);
-  windowed_max_bw_.Update(bw_sample, now);
-  EXPECT_EQ(bw_sample, windowed_max_bw_.GetThirdBest());
-  EXPECT_EQ(bw_sample, windowed_max_bw_.GetSecondBest());
-  EXPECT_EQ(bw_sample, windowed_max_bw_.GetBest());
-}
-
-TEST_F(WindowedFilterTest, ExpireBestMin) {
-  InitializeMinFilter();
-  QuicTime::Delta old_third_best = windowed_min_rtt_.GetThirdBest();
-  QuicTime::Delta old_second_best = windowed_min_rtt_.GetSecondBest();
-  QuicTime::Delta rtt_sample =
-      old_third_best + QuicTime::Delta::FromMilliseconds(5);
-  // Best min sample was recorded at 25ms, so expiry time is 124ms.
-  QuicTime now = QuicTime::Zero() + QuicTime::Delta::FromMilliseconds(125);
-  windowed_min_rtt_.Update(rtt_sample, now);
-  EXPECT_EQ(rtt_sample, windowed_min_rtt_.GetThirdBest());
-  EXPECT_EQ(old_third_best, windowed_min_rtt_.GetSecondBest());
-  EXPECT_EQ(old_second_best, windowed_min_rtt_.GetBest());
-}
-
-TEST_F(WindowedFilterTest, ExpireBestMax) {
-  InitializeMaxFilter();
-  QuicBandwidth old_third_best = windowed_max_bw_.GetThirdBest();
-  QuicBandwidth old_second_best = windowed_max_bw_.GetSecondBest();
-  QuicBandwidth bw_sample =
-      old_third_best - QuicBandwidth::FromBitsPerSecond(50);
-  // Best max sample was recorded at 25ms, so expiry time is 124ms.
-  QuicTime now = QuicTime::Zero() + QuicTime::Delta::FromMilliseconds(125);
-  windowed_max_bw_.Update(bw_sample, now);
-  EXPECT_EQ(bw_sample, windowed_max_bw_.GetThirdBest());
-  EXPECT_EQ(old_third_best, windowed_max_bw_.GetSecondBest());
-  EXPECT_EQ(old_second_best, windowed_max_bw_.GetBest());
-}
-
-TEST_F(WindowedFilterTest, ExpireSecondBestMin) {
-  InitializeMinFilter();
-  QuicTime::Delta old_third_best = windowed_min_rtt_.GetThirdBest();
-  QuicTime::Delta rtt_sample =
-      old_third_best + QuicTime::Delta::FromMilliseconds(5);
-  // Second best min sample was recorded at 75ms, so expiry time is 174ms.
-  QuicTime now = QuicTime::Zero() + QuicTime::Delta::FromMilliseconds(175);
-  windowed_min_rtt_.Update(rtt_sample, now);
-  EXPECT_EQ(rtt_sample, windowed_min_rtt_.GetThirdBest());
-  EXPECT_EQ(rtt_sample, windowed_min_rtt_.GetSecondBest());
-  EXPECT_EQ(old_third_best, windowed_min_rtt_.GetBest());
-}
-
-TEST_F(WindowedFilterTest, ExpireSecondBestMax) {
-  InitializeMaxFilter();
-  QuicBandwidth old_third_best = windowed_max_bw_.GetThirdBest();
-  QuicBandwidth bw_sample =
-      old_third_best - QuicBandwidth::FromBitsPerSecond(50);
-  // Second best max sample was recorded at 75ms, so expiry time is 174ms.
-  QuicTime now = QuicTime::Zero() + QuicTime::Delta::FromMilliseconds(175);
-  windowed_max_bw_.Update(bw_sample, now);
-  EXPECT_EQ(bw_sample, windowed_max_bw_.GetThirdBest());
-  EXPECT_EQ(bw_sample, windowed_max_bw_.GetSecondBest());
-  EXPECT_EQ(old_third_best, windowed_max_bw_.GetBest());
-}
-
-TEST_F(WindowedFilterTest, ExpireAllMins) {
-  InitializeMinFilter();
-  QuicTime::Delta rtt_sample =
-      windowed_min_rtt_.GetThirdBest() + QuicTime::Delta::FromMilliseconds(5);
-  // This assert is necessary to avoid triggering -Wstrict-overflow
-  // See crbug/616957
-  ASSERT_LT(windowed_min_rtt_.GetThirdBest(),
-            QuicTime::Delta::Infinite() - QuicTime::Delta::FromMilliseconds(5));
-
-  // Third best min sample was recorded at 100ms, so expiry time is 199ms.
-  QuicTime now = QuicTime::Zero() + QuicTime::Delta::FromMilliseconds(200);
-  windowed_min_rtt_.Update(rtt_sample, now);
-  EXPECT_EQ(rtt_sample, windowed_min_rtt_.GetThirdBest());
-  EXPECT_EQ(rtt_sample, windowed_min_rtt_.GetSecondBest());
-  EXPECT_EQ(rtt_sample, windowed_min_rtt_.GetBest());
-}
-
-TEST_F(WindowedFilterTest, ExpireAllMaxs) {
-  InitializeMaxFilter();
-  QuicBandwidth bw_sample =
-      windowed_max_bw_.GetThirdBest() - QuicBandwidth::FromBitsPerSecond(50);
-  // Third best max sample was recorded at 100ms, so expiry time is 199ms.
-  QuicTime now = QuicTime::Zero() + QuicTime::Delta::FromMilliseconds(200);
-  windowed_max_bw_.Update(bw_sample, now);
-  EXPECT_EQ(bw_sample, windowed_max_bw_.GetThirdBest());
-  EXPECT_EQ(bw_sample, windowed_max_bw_.GetSecondBest());
-  EXPECT_EQ(bw_sample, windowed_max_bw_.GetBest());
-}
-
-// Test the windowed filter where the time used is an exact counter instead of a
-// timestamp.  This is useful if, for example, the time is measured in round
-// trips.
-TEST_F(WindowedFilterTest, ExpireCounterBasedMax) {
-  // Create a window which starts at t = 0 and expires after two cycles.
-  WindowedFilter<uint64_t, MaxFilter<uint64_t>, uint64_t, uint64_t> max_filter(
-      2, 0, 0);
-
-  // Insert 50000 at t = 1.
-  const uint64_t kBest = 50000;
-  max_filter.Update(50000, 1);
-  EXPECT_EQ(kBest, max_filter.GetBest());
-  UpdateWithIrrelevantSamples(&max_filter, 20, 1);
-  EXPECT_EQ(kBest, max_filter.GetBest());
-
-  // Insert 40000 at t = 2.  Nothing is expected to expire.
-  max_filter.Update(40000, 2);
-  EXPECT_EQ(kBest, max_filter.GetBest());
-  UpdateWithIrrelevantSamples(&max_filter, 20, 2);
-  EXPECT_EQ(kBest, max_filter.GetBest());
-
-  // Insert 30000 at t = 3.  Nothing is expected to expire yet.
-  max_filter.Update(30000, 3);
-  EXPECT_EQ(kBest, max_filter.GetBest());
-  UpdateWithIrrelevantSamples(&max_filter, 20, 3);
-  EXPECT_EQ(kBest, max_filter.GetBest());
-  VLOG(0) << max_filter.GetSecondBest();
-  VLOG(0) << max_filter.GetThirdBest();
-
-  // Insert 20000 at t = 4.  50000 at t = 1 expires, so 40000 becomes the new
-  // maximum.
-  const uint64_t kNewBest = 40000;
-  max_filter.Update(20000, 4);
-  EXPECT_EQ(kNewBest, max_filter.GetBest());
-  UpdateWithIrrelevantSamples(&max_filter, 20, 4);
-  EXPECT_EQ(kNewBest, max_filter.GetBest());
-}
-
-}  // namespace
-}  // namespace test
-}  // namespace net