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chromium / chromium / src / 1b71114eba7ab4e982eaf03186b12503c8ca49c4 / . / net / nqe / network_quality_estimator_unittest.cc
blob: 604db64bd690e5ebb1f46edff8b6bcac23417796 [file] [log] [blame]
// Copyright 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 "net/nqe/network_quality_estimator.h"
#include <stddef.h>
#include <stdint.h>
#include <cmath>
#include <limits>
#include <map>
#include <string>
#include <utility>
#include <vector>
#include "base/logging.h"
#include "base/macros.h"
#include "base/metrics/histogram_samples.h"
#include "base/optional.h"
#include "base/run_loop.h"
#include "base/strings/string_number_conversions.h"
#include "base/test/metrics/histogram_tester.h"
#include "base/test/simple_test_tick_clock.h"
#include "base/threading/platform_thread.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "net/base/load_flags.h"
#include "net/base/network_change_notifier.h"
#include "net/http/http_response_headers.h"
#include "net/http/http_response_info.h"
#include "net/http/http_status_code.h"
#include "net/log/test_net_log.h"
#include "net/nqe/effective_connection_type.h"
#include "net/nqe/effective_connection_type_observer.h"
#include "net/nqe/network_quality_estimator_test_util.h"
#include "net/nqe/network_quality_observation.h"
#include "net/nqe/network_quality_observation_source.h"
#include "net/nqe/observation_buffer.h"
#include "net/nqe/rtt_throughput_estimates_observer.h"
#include "net/socket/socket_performance_watcher.h"
#include "net/socket/socket_performance_watcher_factory.h"
#include "net/test/test_with_scoped_task_environment.h"
#include "net/traffic_annotation/network_traffic_annotation_test_helper.h"
#include "net/url_request/url_request.h"
#include "net/url_request/url_request_test_util.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "url/gurl.h"
namespace {
// Verifies that the number of samples in the bucket with minimum value
// |bucket_min| in |histogram| are at least |expected_min_count_samples|.
void ExpectBucketCountAtLeast(base::HistogramTester* histogram_tester,
const std::string& histogram,
int32_t bucket_min,
int32_t expected_min_count_samples) {
std::vector<base::Bucket> buckets =
histogram_tester->GetAllSamples(histogram);
int actual_count_samples = 0;
for (const auto& bucket : buckets) {
if (bucket.min == bucket_min)
actual_count_samples += bucket.count;
}
EXPECT_LE(expected_min_count_samples, actual_count_samples)
<< " histogram=" << histogram << " bucket_min=" << bucket_min
<< " expected_min_count_samples=" << expected_min_count_samples;
}
} // namespace
namespace net {
namespace {
class TestEffectiveConnectionTypeObserver
: public EffectiveConnectionTypeObserver {
public:
std::vector<EffectiveConnectionType>& effective_connection_types() {
return effective_connection_types_;
}
// EffectiveConnectionTypeObserver implementation:
void OnEffectiveConnectionTypeChanged(EffectiveConnectionType type) override {
effective_connection_types_.push_back(type);
}
private:
std::vector<EffectiveConnectionType> effective_connection_types_;
};
class TestRTTAndThroughputEstimatesObserver
: public RTTAndThroughputEstimatesObserver {
public:
TestRTTAndThroughputEstimatesObserver()
: http_rtt_(nqe::internal::InvalidRTT()),
transport_rtt_(nqe::internal::InvalidRTT()),
downstream_throughput_kbps_(nqe::internal::INVALID_RTT_THROUGHPUT),
notifications_received_(0) {}
// RTTAndThroughputEstimatesObserver implementation:
void OnRTTOrThroughputEstimatesComputed(
base::TimeDelta http_rtt,
base::TimeDelta transport_rtt,
int32_t downstream_throughput_kbps) override {
http_rtt_ = http_rtt;
transport_rtt_ = transport_rtt;
downstream_throughput_kbps_ = downstream_throughput_kbps;
notifications_received_++;
}
int notifications_received() const { return notifications_received_; }
base::TimeDelta http_rtt() const { return http_rtt_; }
base::TimeDelta transport_rtt() const { return transport_rtt_; }
int32_t downstream_throughput_kbps() const {
return downstream_throughput_kbps_;
}
private:
base::TimeDelta http_rtt_;
base::TimeDelta transport_rtt_;
int32_t downstream_throughput_kbps_;
int notifications_received_;
};
class TestRTTObserver : public NetworkQualityEstimator::RTTObserver {
public:
struct Observation {
Observation(int32_t ms,
const base::TimeTicks& ts,
NetworkQualityObservationSource src)
: rtt_ms(ms), timestamp(ts), source(src) {}
int32_t rtt_ms;
base::TimeTicks timestamp;
NetworkQualityObservationSource source;
};
std::vector<Observation>& observations() { return observations_; }
// RttObserver implementation:
void OnRTTObservation(int32_t rtt_ms,
const base::TimeTicks& timestamp,
NetworkQualityObservationSource source) override {
observations_.push_back(Observation(rtt_ms, timestamp, source));
}
// Returns the last received RTT observation that has source set to |source|.
base::TimeDelta last_rtt(NetworkQualityObservationSource source) {
for (auto i = observations_.rbegin(); i != observations_.rend(); ++i) {
Observation observation = *i;
if (observation.source == source)
return base::TimeDelta::FromMilliseconds(observation.rtt_ms);
}
return nqe::internal::InvalidRTT();
}
private:
std::vector<Observation> observations_;
};
class TestThroughputObserver
: public NetworkQualityEstimator::ThroughputObserver {
public:
struct Observation {
Observation(int32_t kbps,
const base::TimeTicks& ts,
NetworkQualityObservationSource src)
: throughput_kbps(kbps), timestamp(ts), source(src) {}
int32_t throughput_kbps;
base::TimeTicks timestamp;
NetworkQualityObservationSource source;
};
std::vector<Observation>& observations() { return observations_; }
// ThroughputObserver implementation:
void OnThroughputObservation(
int32_t throughput_kbps,
const base::TimeTicks& timestamp,
NetworkQualityObservationSource source) override {
observations_.push_back(Observation(throughput_kbps, timestamp, source));
}
private:
std::vector<Observation> observations_;
};
} // namespace
using NetworkQualityEstimatorTest = TestWithScopedTaskEnvironment;
TEST_F(NetworkQualityEstimatorTest, TestKbpsRTTUpdates) {
base::HistogramTester histogram_tester;
// Enable requests to local host to be used for network quality estimation.
std::map<std::string, std::string> variation_params;
variation_params["throughput_min_requests_in_flight"] = "1";
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_UNKNOWN, "test");
histogram_tester.ExpectUniqueSample("NQE.CachedNetworkQualityAvailable",
false, 2);
base::TimeDelta rtt;
int32_t kbps;
EXPECT_FALSE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_FALSE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
std::unique_ptr<URLRequest> request(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request->SetLoadFlags(request->load_flags() | LOAD_MAIN_FRAME_DEPRECATED);
request->Start();
test_delegate.RunUntilComplete();
// Pump message loop to allow estimator tasks to be processed.
base::RunLoop().RunUntilIdle();
// Both RTT and downstream throughput should be updated.
base::TimeDelta http_rtt;
EXPECT_TRUE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &http_rtt, nullptr));
EXPECT_EQ(http_rtt, estimator.GetHttpRTT().value());
EXPECT_TRUE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
EXPECT_EQ(kbps, estimator.GetDownstreamThroughputKbps().value());
base::TimeDelta transport_rtt;
EXPECT_FALSE(estimator.GetTransportRTT());
EXPECT_FALSE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
base::TimeTicks(), &transport_rtt, nullptr));
// Verify the contents of the net log.
EXPECT_LE(
2, estimator.GetEntriesCount(NetLogEventType::NETWORK_QUALITY_CHANGED));
EXPECT_EQ(http_rtt.InMilliseconds(),
estimator.GetNetLogLastIntegerValue(
NetLogEventType::NETWORK_QUALITY_CHANGED, "http_rtt_ms"));
EXPECT_EQ(-1,
estimator.GetNetLogLastIntegerValue(
NetLogEventType::NETWORK_QUALITY_CHANGED, "transport_rtt_ms"));
EXPECT_EQ(kbps, estimator.GetNetLogLastIntegerValue(
NetLogEventType::NETWORK_QUALITY_CHANGED,
"downstream_throughput_kbps"));
// Check UMA histograms.
histogram_tester.ExpectUniqueSample(
"NQE.MainFrame.EffectiveConnectionType",
EffectiveConnectionType::EFFECTIVE_CONNECTION_TYPE_UNKNOWN, 1);
histogram_tester.ExpectUniqueSample("NQE.EstimateAvailable.MainFrame.RTT", 0,
1);
histogram_tester.ExpectUniqueSample(
"NQE.EstimateAvailable.MainFrame.TransportRTT", 0, 1);
histogram_tester.ExpectUniqueSample("NQE.EstimateAvailable.MainFrame.Kbps", 0,
1);
EXPECT_LE(1u,
histogram_tester.GetAllSamples("NQE.RTT.OnECTComputation").size());
EXPECT_LE(1u,
histogram_tester.GetAllSamples("NQE.Kbps.OnECTComputation").size());
histogram_tester.ExpectBucketCount(
"NQE.RTT.ObservationSource", NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP, 1);
histogram_tester.ExpectBucketCount(
"NQE.Kbps.ObservationSource", NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP, 1);
histogram_tester.ExpectTotalCount("NQE.Kbps.RawObservation.Http", 1);
std::unique_ptr<URLRequest> request2(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request2->SetLoadFlags(request2->load_flags() | LOAD_MAIN_FRAME_DEPRECATED);
request2->Start();
test_delegate.RunUntilComplete();
histogram_tester.ExpectTotalCount("NQE.MainFrame.EffectiveConnectionType", 2);
histogram_tester.ExpectBucketCount("NQE.EstimateAvailable.MainFrame.RTT", 1,
1);
histogram_tester.ExpectUniqueSample(
"NQE.EstimateAvailable.MainFrame.TransportRTT", 0, 2);
histogram_tester.ExpectBucketCount("NQE.EstimateAvailable.MainFrame.Kbps", 1,
1);
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, "test-1");
histogram_tester.ExpectUniqueSample("NQE.CachedNetworkQualityAvailable",
false, 3);
histogram_tester.ExpectTotalCount("NQE.RatioMedianRTT.WiFi", 0);
EXPECT_FALSE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_FALSE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
// Verify that metrics are logged correctly on main-frame requests.
histogram_tester.ExpectTotalCount("NQE.MainFrame.RTT.Percentile50", 1);
histogram_tester.ExpectTotalCount("NQE.MainFrame.TransportRTT.Percentile50",
0);
histogram_tester.ExpectTotalCount("NQE.MainFrame.Kbps.Percentile50", 1);
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, std::string());
histogram_tester.ExpectUniqueSample("NQE.CachedNetworkQualityAvailable",
false, 4);
EXPECT_FALSE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_FALSE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
std::unique_ptr<URLRequest> request3(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request3->SetLoadFlags(request2->load_flags() | LOAD_MAIN_FRAME_DEPRECATED);
request3->Start();
test_delegate.RunUntilComplete();
histogram_tester.ExpectBucketCount(
"NQE.MainFrame.EffectiveConnectionType",
EffectiveConnectionType::EFFECTIVE_CONNECTION_TYPE_UNKNOWN, 2);
histogram_tester.ExpectTotalCount("NQE.MainFrame.EffectiveConnectionType", 3);
histogram_tester.ExpectBucketCount("NQE.EstimateAvailable.MainFrame.RTT", 0,
2);
histogram_tester.ExpectBucketCount("NQE.EstimateAvailable.MainFrame.RTT", 1,
1);
histogram_tester.ExpectUniqueSample(
"NQE.EstimateAvailable.MainFrame.TransportRTT", 0, 3);
histogram_tester.ExpectBucketCount("NQE.EstimateAvailable.MainFrame.Kbps", 0,
2);
histogram_tester.ExpectBucketCount("NQE.EstimateAvailable.MainFrame.Kbps", 1,
1);
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_UNKNOWN, "test");
histogram_tester.ExpectBucketCount("NQE.CachedNetworkQualityAvailable", false,
4);
}
// Tests that the network quality estimator writes and reads network quality
// from the cache store correctly.
TEST_F(NetworkQualityEstimatorTest, Caching) {
for (NetworkChangeNotifier::ConnectionType connection_type :
{NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI,
NetworkChangeNotifier::ConnectionType::CONNECTION_ETHERNET}) {
base::HistogramTester histogram_tester;
std::map<std::string, std::string> variation_params;
variation_params["throughput_min_requests_in_flight"] = "1";
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
const std::string connection_id =
connection_type ==
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI
? "test"
: "";
estimator.SimulateNetworkChange(connection_type, connection_id);
histogram_tester.ExpectUniqueSample("NQE.CachedNetworkQualityAvailable",
false, 2);
base::TimeDelta rtt;
int32_t kbps;
EXPECT_FALSE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_FALSE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
// Start two requests so that the network quality is added to cache store at
// the beginning of the second request from the network traffic observed
// from the first request.
for (size_t i = 0; i < 2; ++i) {
std::unique_ptr<URLRequest> request(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request->SetLoadFlags(request->load_flags() | LOAD_MAIN_FRAME_DEPRECATED);
request->Start();
test_delegate.RunUntilComplete();
}
histogram_tester.ExpectUniqueSample("NQE.RTT.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP,
2);
base::RunLoop().RunUntilIdle();
// Both RTT and downstream throughput should be updated.
EXPECT_TRUE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(rtt, estimator.GetHttpRTT().value());
EXPECT_TRUE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
EXPECT_EQ(kbps, estimator.GetDownstreamThroughputKbps().value());
EXPECT_NE(EFFECTIVE_CONNECTION_TYPE_UNKNOWN,
estimator.GetEffectiveConnectionType());
EXPECT_FALSE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
base::TimeTicks(), &rtt, nullptr));
EXPECT_FALSE(estimator.GetTransportRTT());
histogram_tester.ExpectBucketCount("NQE.CachedNetworkQualityAvailable",
false, 2);
// Add the observers before changing the network type.
TestEffectiveConnectionTypeObserver observer;
estimator.AddEffectiveConnectionTypeObserver(&observer);
TestRTTObserver rtt_observer;
estimator.AddRTTObserver(&rtt_observer);
TestThroughputObserver throughput_observer;
estimator.AddThroughputObserver(&throughput_observer);
// |observer| should be notified as soon as it is added.
base::RunLoop().RunUntilIdle();
EXPECT_EQ(1U, observer.effective_connection_types().size());
int num_net_log_entries =
estimator.GetEntriesCount(NetLogEventType::NETWORK_QUALITY_CHANGED);
EXPECT_LE(2, num_net_log_entries);
estimator.SimulateNetworkChange(connection_type, connection_id);
histogram_tester.ExpectBucketCount(
"NQE.RTT.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP_CACHED_ESTIMATE, 1);
histogram_tester.ExpectBucketCount(
"NQE.RTT.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_TRANSPORT_CACHED_ESTIMATE, 1);
histogram_tester.ExpectTotalCount("NQE.RTT.ObservationSource", 4);
histogram_tester.ExpectBucketCount(
"NQE.Kbps.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP_CACHED_ESTIMATE, 1);
histogram_tester.ExpectTotalCount(
"NQE.Kbps.RawObservation.HttpCachedEstimate", 1);
// Verify the contents of the net log.
EXPECT_LE(
1, estimator.GetEntriesCount(NetLogEventType::NETWORK_QUALITY_CHANGED) -
num_net_log_entries);
EXPECT_NE(-1, estimator.GetNetLogLastIntegerValue(
NetLogEventType::NETWORK_QUALITY_CHANGED, "http_rtt_ms"));
EXPECT_NE(
-1, estimator.GetNetLogLastIntegerValue(
NetLogEventType::NETWORK_QUALITY_CHANGED, "transport_rtt_ms"));
EXPECT_NE(-1, estimator.GetNetLogLastIntegerValue(
NetLogEventType::NETWORK_QUALITY_CHANGED,
"downstream_throughput_kbps"));
EXPECT_EQ(GetNameForEffectiveConnectionType(
estimator.GetEffectiveConnectionType()),
estimator.GetNetLogLastStringValue(
NetLogEventType::NETWORK_QUALITY_CHANGED,
"effective_connection_type"));
histogram_tester.ExpectBucketCount("NQE.CachedNetworkQualityAvailable",
true, 1);
histogram_tester.ExpectTotalCount("NQE.CachedNetworkQualityAvailable", 3);
base::RunLoop().RunUntilIdle();
// Verify that the cached network quality was read, and observers were
// notified. |observer| must be notified once right after it was added, and
// once again after the cached network quality was read.
EXPECT_LE(2U, observer.effective_connection_types().size());
EXPECT_EQ(estimator.GetEffectiveConnectionType(),
observer.effective_connection_types().back());
EXPECT_EQ(2U, rtt_observer.observations().size());
EXPECT_EQ(1U, throughput_observer.observations().size());
}
}
// Tests that the network quality estimator does not read the network quality
// from the cache store when caching is not enabled.
TEST_F(NetworkQualityEstimatorTest, CachingDisabled) {
base::HistogramTester histogram_tester;
std::map<std::string, std::string> variation_params;
// Do not set |persistent_cache_reading_enabled| variation param.
variation_params["persistent_cache_reading_enabled"] = "false";
variation_params["throughput_min_requests_in_flight"] = "1";
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, "test");
histogram_tester.ExpectTotalCount("NQE.CachedNetworkQualityAvailable", 0);
base::TimeDelta rtt;
int32_t kbps;
EXPECT_FALSE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_FALSE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
// Start two requests so that the network quality is added to cache store at
// the beginning of the second request from the network traffic observed from
// the first request.
for (size_t i = 0; i < 2; ++i) {
std::unique_ptr<URLRequest> request(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request->SetLoadFlags(request->load_flags() | LOAD_MAIN_FRAME_DEPRECATED);
request->Start();
test_delegate.RunUntilComplete();
}
base::RunLoop().RunUntilIdle();
// Both RTT and downstream throughput should be updated.
EXPECT_TRUE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(rtt, estimator.GetHttpRTT().value());
EXPECT_TRUE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
EXPECT_EQ(kbps, estimator.GetDownstreamThroughputKbps().value());
EXPECT_NE(EFFECTIVE_CONNECTION_TYPE_UNKNOWN,
estimator.GetEffectiveConnectionType());
EXPECT_FALSE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
base::TimeTicks(), &rtt, nullptr));
EXPECT_FALSE(estimator.GetTransportRTT());
histogram_tester.ExpectTotalCount("NQE.CachedNetworkQualityAvailable", 0);
// Add the observers before changing the network type.
TestRTTObserver rtt_observer;
estimator.AddRTTObserver(&rtt_observer);
TestThroughputObserver throughput_observer;
estimator.AddThroughputObserver(&throughput_observer);
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_2G, "test");
histogram_tester.ExpectTotalCount("NQE.CachedNetworkQualityAvailable", 0);
base::RunLoop().RunUntilIdle();
// Verify that the cached network quality was read, and observers were
// notified. |observer| must be notified once right after it was added, and
// once again after the cached network quality was read.
EXPECT_EQ(0U, rtt_observer.observations().size());
EXPECT_EQ(0U, throughput_observer.observations().size());
}
TEST_F(NetworkQualityEstimatorTest, QuicObservations) {
base::HistogramTester histogram_tester;
std::map<std::string, std::string> variation_params;
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
estimator.OnUpdatedTransportRTTAvailable(
SocketPerformanceWatcherFactory::PROTOCOL_TCP,
base::TimeDelta::FromMilliseconds(10), base::nullopt);
estimator.OnUpdatedTransportRTTAvailable(
SocketPerformanceWatcherFactory::PROTOCOL_QUIC,
base::TimeDelta::FromMilliseconds(10), base::nullopt);
histogram_tester.ExpectBucketCount("NQE.RTT.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_TCP, 1);
histogram_tester.ExpectBucketCount(
"NQE.RTT.ObservationSource", NETWORK_QUALITY_OBSERVATION_SOURCE_QUIC, 1);
histogram_tester.ExpectTotalCount("NQE.EndToEndRTT.OnECTComputation", 1);
histogram_tester.ExpectTotalCount("NQE.RTT.ObservationSource", 2);
}
TEST_F(NetworkQualityEstimatorTest, StoreObservations) {
std::map<std::string, std::string> variation_params;
variation_params["throughput_min_requests_in_flight"] = "1";
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
base::TimeDelta rtt;
int32_t kbps;
EXPECT_FALSE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_FALSE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
const size_t kMaxObservations = 10;
for (size_t i = 0; i < kMaxObservations; ++i) {
std::unique_ptr<URLRequest> request(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request->Start();
test_delegate.RunUntilComplete();
// Pump the message loop to process estimator tasks.
base::RunLoop().RunUntilIdle();
EXPECT_TRUE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_TRUE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
}
// Verify that the stored observations are cleared on network change.
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, "test-2");
EXPECT_FALSE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_FALSE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
}
// This test notifies NetworkQualityEstimator of received data. Next,
// throughput and RTT percentiles are checked for correctness by doing simple
// verifications.
TEST_F(NetworkQualityEstimatorTest, ComputedPercentiles) {
std::map<std::string, std::string> variation_params;
variation_params["throughput_min_requests_in_flight"] = "1";
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
EXPECT_EQ(nqe::internal::InvalidRTT(),
estimator.GetRTTEstimateInternal(
base::TimeTicks(), nqe::internal::OBSERVATION_CATEGORY_HTTP,
100, nullptr));
EXPECT_EQ(nqe::internal::INVALID_RTT_THROUGHPUT,
estimator.GetDownlinkThroughputKbpsEstimateInternal(
base::TimeTicks(), 100));
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
for (size_t i = 0; i < 10U; ++i) {
std::unique_ptr<URLRequest> request(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request->Start();
test_delegate.RunUntilComplete();
}
// Verify the percentiles through simple tests.
for (int i = 0; i <= 100; ++i) {
EXPECT_GT(estimator.GetDownlinkThroughputKbpsEstimateInternal(
base::TimeTicks(), i),
0);
EXPECT_LT(estimator.GetRTTEstimateInternal(
base::TimeTicks(), nqe::internal::OBSERVATION_CATEGORY_HTTP,
i, nullptr),
base::TimeDelta::Max());
if (i != 0) {
// Throughput percentiles are in decreasing order.
EXPECT_LE(estimator.GetDownlinkThroughputKbpsEstimateInternal(
base::TimeTicks(), i),
estimator.GetDownlinkThroughputKbpsEstimateInternal(
base::TimeTicks(), i - 1));
// RTT percentiles are in increasing order.
EXPECT_GE(estimator.GetRTTEstimateInternal(
base::TimeTicks(), nqe::internal::OBSERVATION_CATEGORY_HTTP,
i, nullptr),
estimator.GetRTTEstimateInternal(
base::TimeTicks(), nqe::internal::OBSERVATION_CATEGORY_HTTP,
i - 1, nullptr));
}
}
}
// Verifies that the observers receive the notifications when default estimates
// are added to the observations.
TEST_F(NetworkQualityEstimatorTest, DefaultObservations) {
base::HistogramTester histogram_tester;
TestEffectiveConnectionTypeObserver effective_connection_type_observer;
TestRTTAndThroughputEstimatesObserver rtt_throughput_estimates_observer;
TestRTTObserver rtt_observer;
TestThroughputObserver throughput_observer;
std::map<std::string, std::string> variation_params;
TestNetworkQualityEstimator estimator(variation_params, false, false,
std::make_unique<BoundTestNetLog>());
// Default observations should be added when constructing the |estimator|.
histogram_tester.ExpectBucketCount(
"NQE.RTT.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_DEFAULT_HTTP_FROM_PLATFORM, 1);
histogram_tester.ExpectBucketCount(
"NQE.RTT.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_DEFAULT_TRANSPORT_FROM_PLATFORM, 1);
histogram_tester.ExpectBucketCount(
"NQE.Kbps.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_DEFAULT_HTTP_FROM_PLATFORM, 1);
histogram_tester.ExpectTotalCount("NQE.Kbps.RawObservation.HttpPlatform", 1);
histogram_tester.ExpectTotalCount("NQE.RTT.ObservationSource", 2);
histogram_tester.ExpectTotalCount("NQE.RTT.RawObservation.HttpPlatform", 1);
histogram_tester.ExpectTotalCount("NQE.RTT.RawObservation.TransportPlatform",
1);
histogram_tester.ExpectTotalCount("NQE.Kbps.ObservationSource", 1);
// Default observations should be added on connection change.
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_UNKNOWN, "unknown-1");
histogram_tester.ExpectBucketCount(
"NQE.RTT.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_DEFAULT_HTTP_FROM_PLATFORM, 2);
histogram_tester.ExpectBucketCount(
"NQE.RTT.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_DEFAULT_TRANSPORT_FROM_PLATFORM, 2);
histogram_tester.ExpectBucketCount(
"NQE.Kbps.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_DEFAULT_HTTP_FROM_PLATFORM, 2);
histogram_tester.ExpectTotalCount("NQE.Kbps.RawObservation.HttpPlatform", 2);
histogram_tester.ExpectTotalCount("NQE.RTT.ObservationSource", 4);
histogram_tester.ExpectTotalCount("NQE.RTT.RawObservation.HttpPlatform", 2);
histogram_tester.ExpectTotalCount("NQE.RTT.RawObservation.TransportPlatform",
2);
histogram_tester.ExpectTotalCount("NQE.Kbps.ObservationSource", 2);
base::TimeDelta rtt;
int32_t kbps;
// Default estimates should be available.
EXPECT_TRUE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(base::TimeDelta::FromMilliseconds(115), rtt);
EXPECT_EQ(rtt, estimator.GetHttpRTT().value());
EXPECT_TRUE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(base::TimeDelta::FromMilliseconds(55), rtt);
EXPECT_EQ(rtt, estimator.GetTransportRTT().value());
EXPECT_TRUE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
EXPECT_EQ(1961, kbps);
EXPECT_EQ(kbps, estimator.GetDownstreamThroughputKbps().value());
estimator.AddEffectiveConnectionTypeObserver(
&effective_connection_type_observer);
estimator.AddRTTAndThroughputEstimatesObserver(
&rtt_throughput_estimates_observer);
estimator.AddRTTObserver(&rtt_observer);
estimator.AddThroughputObserver(&throughput_observer);
// Simulate network change to 3G. Default estimates should be available.
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_3G, "test-3");
EXPECT_TRUE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
// Taken from network_quality_estimator_params.cc.
EXPECT_EQ(base::TimeDelta::FromMilliseconds(273), rtt);
EXPECT_EQ(rtt, estimator.GetHttpRTT().value());
EXPECT_TRUE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(base::TimeDelta::FromMilliseconds(209), rtt);
EXPECT_EQ(rtt, estimator.GetTransportRTT());
EXPECT_TRUE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
EXPECT_EQ(749, kbps);
EXPECT_EQ(kbps, estimator.GetDownstreamThroughputKbps().value());
EXPECT_NE(EFFECTIVE_CONNECTION_TYPE_UNKNOWN,
estimator.GetEffectiveConnectionType());
EXPECT_EQ(
1U,
effective_connection_type_observer.effective_connection_types().size());
EXPECT_NE(
EFFECTIVE_CONNECTION_TYPE_UNKNOWN,
effective_connection_type_observer.effective_connection_types().front());
// Verify the contents of the net log.
EXPECT_LE(
3, estimator.GetEntriesCount(NetLogEventType::NETWORK_QUALITY_CHANGED));
EXPECT_NE(
GetNameForEffectiveConnectionType(EFFECTIVE_CONNECTION_TYPE_UNKNOWN),
estimator.GetNetLogLastStringValue(
NetLogEventType::NETWORK_QUALITY_CHANGED,
"effective_connection_type"));
EXPECT_EQ(4, rtt_throughput_estimates_observer.notifications_received());
EXPECT_EQ(base::TimeDelta::FromMilliseconds(273),
rtt_throughput_estimates_observer.http_rtt());
EXPECT_EQ(base::TimeDelta::FromMilliseconds(209),
rtt_throughput_estimates_observer.transport_rtt());
EXPECT_EQ(749,
rtt_throughput_estimates_observer.downstream_throughput_kbps());
EXPECT_EQ(2U, rtt_observer.observations().size());
EXPECT_EQ(273, rtt_observer.observations().at(0).rtt_ms);
EXPECT_EQ(NETWORK_QUALITY_OBSERVATION_SOURCE_DEFAULT_HTTP_FROM_PLATFORM,
rtt_observer.observations().at(0).source);
EXPECT_EQ(209, rtt_observer.observations().at(1).rtt_ms);
EXPECT_EQ(NETWORK_QUALITY_OBSERVATION_SOURCE_DEFAULT_TRANSPORT_FROM_PLATFORM,
rtt_observer.observations().at(1).source);
EXPECT_EQ(1U, throughput_observer.observations().size());
EXPECT_EQ(749, throughput_observer.observations().at(0).throughput_kbps);
EXPECT_EQ(NETWORK_QUALITY_OBSERVATION_SOURCE_DEFAULT_HTTP_FROM_PLATFORM,
throughput_observer.observations().at(0).source);
}
// Verifies that the default observations are added to the set of observations.
// If default observations are overridden using field trial parameters, verify
// that the overriding values are used.
TEST_F(NetworkQualityEstimatorTest, DefaultObservationsOverridden) {
std::map<std::string, std::string> variation_params;
variation_params["Unknown.DefaultMedianKbps"] = "100";
variation_params["WiFi.DefaultMedianKbps"] = "200";
variation_params["2G.DefaultMedianKbps"] = "300";
variation_params["Unknown.DefaultMedianRTTMsec"] = "1000";
variation_params["WiFi.DefaultMedianRTTMsec"] = "2000";
// Negative variation value should not be used.
variation_params["2G.DefaultMedianRTTMsec"] = "-5";
variation_params["Unknown.DefaultMedianTransportRTTMsec"] = "500";
variation_params["WiFi.DefaultMedianTransportRTTMsec"] = "1000";
// Negative variation value should not be used.
variation_params["2G.DefaultMedianTransportRTTMsec"] = "-5";
TestNetworkQualityEstimator estimator(variation_params, false, false,
std::make_unique<BoundTestNetLog>());
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_UNKNOWN, "unknown-1");
base::TimeDelta rtt;
int32_t kbps;
EXPECT_TRUE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(base::TimeDelta::FromMilliseconds(1000), rtt);
EXPECT_EQ(rtt, estimator.GetHttpRTT().value());
EXPECT_TRUE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(base::TimeDelta::FromMilliseconds(500), rtt);
EXPECT_EQ(rtt, estimator.GetTransportRTT().value());
EXPECT_TRUE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
EXPECT_EQ(100, kbps);
EXPECT_EQ(kbps, estimator.GetDownstreamThroughputKbps().value());
// Simulate network change to Wi-Fi.
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, "test-1");
EXPECT_TRUE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(base::TimeDelta::FromMilliseconds(2000), rtt);
EXPECT_EQ(rtt, estimator.GetHttpRTT().value());
EXPECT_TRUE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(base::TimeDelta::FromMilliseconds(1000), rtt);
EXPECT_EQ(rtt, estimator.GetTransportRTT().value());
EXPECT_TRUE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
EXPECT_EQ(200, kbps);
EXPECT_EQ(kbps, estimator.GetDownstreamThroughputKbps().value());
// Simulate network change to 2G. Only the Kbps default estimate should be
// available.
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_2G, "test-2");
EXPECT_TRUE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
// Taken from network_quality_estimator_params.cc.
EXPECT_EQ(base::TimeDelta::FromMilliseconds(1726), rtt);
EXPECT_EQ(rtt, estimator.GetHttpRTT().value());
EXPECT_TRUE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(base::TimeDelta::FromMilliseconds(1531), rtt);
EXPECT_EQ(rtt, estimator.GetTransportRTT().value());
EXPECT_TRUE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
EXPECT_EQ(300, kbps);
EXPECT_EQ(kbps, estimator.GetDownstreamThroughputKbps().value());
// Simulate network change to 3G. Default estimates should be available.
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_3G, "test-3");
EXPECT_TRUE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(base::TimeDelta::FromMilliseconds(273), rtt);
EXPECT_EQ(rtt, estimator.GetHttpRTT().value());
EXPECT_TRUE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(base::TimeDelta::FromMilliseconds(209), rtt);
EXPECT_EQ(rtt, estimator.GetTransportRTT().value());
EXPECT_TRUE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
EXPECT_EQ(749, kbps);
EXPECT_EQ(kbps, estimator.GetDownstreamThroughputKbps().value());
}
// Tests that |GetEffectiveConnectionType| returns
// EFFECTIVE_CONNECTION_TYPE_OFFLINE when the device is currently offline.
TEST_F(NetworkQualityEstimatorTest, Offline) {
std::map<std::string, std::string> variation_params;
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
const struct {
NetworkChangeNotifier::ConnectionType connection_type;
EffectiveConnectionType expected_connection_type;
} tests[] = {
{NetworkChangeNotifier::CONNECTION_2G, EFFECTIVE_CONNECTION_TYPE_UNKNOWN},
{NetworkChangeNotifier::CONNECTION_NONE,
EFFECTIVE_CONNECTION_TYPE_OFFLINE},
{NetworkChangeNotifier::CONNECTION_3G, EFFECTIVE_CONNECTION_TYPE_UNKNOWN},
};
for (const auto& test : tests) {
estimator.SimulateNetworkChange(test.connection_type, "test");
EXPECT_EQ(test.expected_connection_type,
estimator.GetEffectiveConnectionType());
}
}
// Tests that |GetEffectiveConnectionType| returns correct connection type when
// only RTT thresholds are specified in the variation params.
TEST_F(NetworkQualityEstimatorTest, ObtainThresholdsOnlyRTT) {
std::map<std::string, std::string> variation_params;
variation_params["Offline.ThresholdMedianHttpRTTMsec"] = "4000";
variation_params["Slow2G.ThresholdMedianHttpRTTMsec"] = "2000";
variation_params["2G.ThresholdMedianHttpRTTMsec"] = "1000";
variation_params["3G.ThresholdMedianHttpRTTMsec"] = "500";
TestNetworkQualityEstimator estimator(variation_params);
// Simulate the connection type as Wi-Fi so that GetEffectiveConnectionType
// does not return Offline if the device is offline.
estimator.SimulateNetworkChange(NetworkChangeNotifier::CONNECTION_WIFI,
"test");
const struct {
int32_t rtt_msec;
EffectiveConnectionType expected_conn_type;
} tests[] = {
{5000, EFFECTIVE_CONNECTION_TYPE_OFFLINE},
{4000, EFFECTIVE_CONNECTION_TYPE_OFFLINE},
{3000, EFFECTIVE_CONNECTION_TYPE_SLOW_2G},
{2000, EFFECTIVE_CONNECTION_TYPE_SLOW_2G},
{1500, EFFECTIVE_CONNECTION_TYPE_2G},
{1000, EFFECTIVE_CONNECTION_TYPE_2G},
{700, EFFECTIVE_CONNECTION_TYPE_3G},
{500, EFFECTIVE_CONNECTION_TYPE_3G},
{400, EFFECTIVE_CONNECTION_TYPE_4G},
{300, EFFECTIVE_CONNECTION_TYPE_4G},
{200, EFFECTIVE_CONNECTION_TYPE_4G},
{100, EFFECTIVE_CONNECTION_TYPE_4G},
{20, EFFECTIVE_CONNECTION_TYPE_4G},
};
for (const auto& test : tests) {
estimator.set_recent_http_rtt(
base::TimeDelta::FromMilliseconds(test.rtt_msec));
estimator.set_start_time_null_downlink_throughput_kbps(INT32_MAX);
estimator.set_recent_downlink_throughput_kbps(INT32_MAX);
estimator.SetStartTimeNullHttpRtt(
base::TimeDelta::FromMilliseconds(test.rtt_msec));
EXPECT_EQ(test.expected_conn_type, estimator.GetEffectiveConnectionType());
}
}
// Tests that default HTTP RTT thresholds for different effective
// connection types are correctly set.
TEST_F(NetworkQualityEstimatorTest, DefaultHttpRTTBasedThresholds) {
const struct {
bool override_defaults_using_variation_params;
int32_t http_rtt_msec;
EffectiveConnectionType expected_conn_type;
} tests[] = {
// When the variation params do not override connection thresholds,
// default values should be used.
{false, 5000, EFFECTIVE_CONNECTION_TYPE_SLOW_2G},
{false, 4000, EFFECTIVE_CONNECTION_TYPE_SLOW_2G},
{false, 3000, EFFECTIVE_CONNECTION_TYPE_SLOW_2G},
{false, 2000, EFFECTIVE_CONNECTION_TYPE_2G},
{false, 1500, EFFECTIVE_CONNECTION_TYPE_2G},
{false, 1000, EFFECTIVE_CONNECTION_TYPE_3G},
{false, 100, EFFECTIVE_CONNECTION_TYPE_4G},
{false, 20, EFFECTIVE_CONNECTION_TYPE_4G},
// Override default thresholds using variation params.
{true, 5000, EFFECTIVE_CONNECTION_TYPE_OFFLINE},
{true, 4000, EFFECTIVE_CONNECTION_TYPE_OFFLINE},
{true, 3000, EFFECTIVE_CONNECTION_TYPE_SLOW_2G},
{true, 2000, EFFECTIVE_CONNECTION_TYPE_SLOW_2G},
{true, 1500, EFFECTIVE_CONNECTION_TYPE_2G},
{true, 1000, EFFECTIVE_CONNECTION_TYPE_2G},
{true, 20, EFFECTIVE_CONNECTION_TYPE_4G},
};
for (const auto& test : tests) {
std::map<std::string, std::string> variation_params;
if (test.override_defaults_using_variation_params) {
variation_params["Offline.ThresholdMedianHttpRTTMsec"] = "4000";
variation_params["Slow2G.ThresholdMedianHttpRTTMsec"] = "2000";
variation_params["2G.ThresholdMedianHttpRTTMsec"] = "1000";
}
TestNetworkQualityEstimator estimator(variation_params);
// Simulate the connection type as Wi-Fi so that GetEffectiveConnectionType
// does not return Offline if the device is offline.
estimator.SimulateNetworkChange(NetworkChangeNotifier::CONNECTION_WIFI,
"test");
estimator.SetStartTimeNullHttpRtt(
base::TimeDelta::FromMilliseconds(test.http_rtt_msec));
estimator.set_recent_http_rtt(
base::TimeDelta::FromMilliseconds(test.http_rtt_msec));
estimator.set_start_time_null_downlink_throughput_kbps(INT32_MAX);
estimator.set_recent_downlink_throughput_kbps(INT32_MAX);
EXPECT_EQ(test.expected_conn_type, estimator.GetEffectiveConnectionType());
}
}
// Tests that |GetEffectiveConnectionType| returns correct connection type when
// both HTTP RTT and throughput thresholds are specified in the variation
// params.
TEST_F(NetworkQualityEstimatorTest, ObtainThresholdsHttpRTTandThroughput) {
std::map<std::string, std::string> variation_params;
variation_params["Offline.ThresholdMedianHttpRTTMsec"] = "4000";
variation_params["Slow2G.ThresholdMedianHttpRTTMsec"] = "2000";
variation_params["2G.ThresholdMedianHttpRTTMsec"] = "1000";
variation_params["3G.ThresholdMedianHttpRTTMsec"] = "500";
variation_params["Offline.ThresholdMedianKbps"] = "10";
variation_params["Slow2G.ThresholdMedianKbps"] = "100";
variation_params["2G.ThresholdMedianKbps"] = "300";
variation_params["3G.ThresholdMedianKbps"] = "500";
TestNetworkQualityEstimator estimator(variation_params);
// Simulate the connection type as Wi-Fi so that GetEffectiveConnectionType
// does not return Offline if the device is offline.
estimator.SimulateNetworkChange(NetworkChangeNotifier::CONNECTION_WIFI,
"test");
const struct {
int32_t rtt_msec;
int32_t downlink_throughput_kbps;
EffectiveConnectionType expected_conn_type;
} tests[] = {
// Set RTT to a very low value to observe the effect of throughput.
// Throughput is the bottleneck.
{1, 5, EFFECTIVE_CONNECTION_TYPE_OFFLINE},
{1, 10, EFFECTIVE_CONNECTION_TYPE_OFFLINE},
{1, 50, EFFECTIVE_CONNECTION_TYPE_SLOW_2G},
{1, 100, EFFECTIVE_CONNECTION_TYPE_SLOW_2G},
{1, 150, EFFECTIVE_CONNECTION_TYPE_2G},
{1, 300, EFFECTIVE_CONNECTION_TYPE_2G},
{1, 400, EFFECTIVE_CONNECTION_TYPE_3G},
{1, 500, EFFECTIVE_CONNECTION_TYPE_3G},
{1, 700, EFFECTIVE_CONNECTION_TYPE_4G},
{1, 1000, EFFECTIVE_CONNECTION_TYPE_4G},
{1, 1500, EFFECTIVE_CONNECTION_TYPE_4G},
{1, 2500, EFFECTIVE_CONNECTION_TYPE_4G},
// Set both RTT and throughput. RTT is the bottleneck.
{3000, 25000, EFFECTIVE_CONNECTION_TYPE_SLOW_2G},
{700, 25000, EFFECTIVE_CONNECTION_TYPE_3G},
};
for (const auto& test : tests) {
estimator.SetStartTimeNullHttpRtt(
base::TimeDelta::FromMilliseconds(test.rtt_msec));
estimator.set_recent_http_rtt(
base::TimeDelta::FromMilliseconds(test.rtt_msec));
estimator.set_start_time_null_downlink_throughput_kbps(
test.downlink_throughput_kbps);
estimator.set_recent_downlink_throughput_kbps(
test.downlink_throughput_kbps);
// Run one main frame request to force recomputation of effective connection
// type.
estimator.RunOneRequest();
EXPECT_EQ(test.expected_conn_type, estimator.GetEffectiveConnectionType());
}
}
TEST_F(NetworkQualityEstimatorTest, TestGetMetricsSince) {
std::map<std::string, std::string> variation_params;
const base::TimeDelta rtt_threshold_3g =
base::TimeDelta::FromMilliseconds(30);
const base::TimeDelta rtt_threshold_4g = base::TimeDelta::FromMilliseconds(1);
variation_params["3G.ThresholdMedianHttpRTTMsec"] =
base::IntToString(rtt_threshold_3g.InMilliseconds());
variation_params["HalfLifeSeconds"] = "300000";
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
base::TimeTicks now = base::TimeTicks::Now();
base::TimeTicks old = now - base::TimeDelta::FromMilliseconds(1);
ASSERT_NE(old, now);
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, "test");
const int32_t old_downlink_kbps = 1;
const base::TimeDelta old_url_rtt = base::TimeDelta::FromMilliseconds(1);
const base::TimeDelta old_tcp_rtt = base::TimeDelta::FromMilliseconds(10);
DCHECK_LT(old_url_rtt, rtt_threshold_3g);
DCHECK_LT(old_tcp_rtt, rtt_threshold_3g);
// First sample has very old timestamp.
for (size_t i = 0; i < 2; ++i) {
estimator.http_downstream_throughput_kbps_observations_.AddObservation(
NetworkQualityEstimator::Observation(
old_downlink_kbps, old, INT32_MIN,
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP));
estimator.rtt_ms_observations_[nqe::internal::OBSERVATION_CATEGORY_HTTP]
.AddObservation(NetworkQualityEstimator::Observation(
old_url_rtt.InMilliseconds(), old, INT32_MIN,
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP));
estimator
.rtt_ms_observations_[nqe::internal::OBSERVATION_CATEGORY_TRANSPORT]
.AddObservation(NetworkQualityEstimator::Observation(
old_tcp_rtt.InMilliseconds(), old, INT32_MIN,
NETWORK_QUALITY_OBSERVATION_SOURCE_TCP));
}
const int32_t new_downlink_kbps = 100;
const base::TimeDelta new_url_rtt = base::TimeDelta::FromMilliseconds(100);
const base::TimeDelta new_tcp_rtt = base::TimeDelta::FromMilliseconds(1000);
DCHECK_NE(old_downlink_kbps, new_downlink_kbps);
DCHECK_NE(old_url_rtt, new_url_rtt);
DCHECK_NE(old_tcp_rtt, new_tcp_rtt);
DCHECK_GT(new_url_rtt, rtt_threshold_3g);
DCHECK_GT(new_tcp_rtt, rtt_threshold_3g);
DCHECK_GT(new_url_rtt, rtt_threshold_4g);
DCHECK_GT(new_tcp_rtt, rtt_threshold_4g);
estimator.http_downstream_throughput_kbps_observations_.AddObservation(
NetworkQualityEstimator::Observation(
new_downlink_kbps, now, INT32_MIN,
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP));
estimator.rtt_ms_observations_[nqe::internal::OBSERVATION_CATEGORY_HTTP]
.AddObservation(NetworkQualityEstimator::Observation(
new_url_rtt.InMilliseconds(), now, INT32_MIN,
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP));
estimator.rtt_ms_observations_[nqe::internal::OBSERVATION_CATEGORY_TRANSPORT]
.AddObservation(NetworkQualityEstimator::Observation(
new_tcp_rtt.InMilliseconds(), now, INT32_MIN,
NETWORK_QUALITY_OBSERVATION_SOURCE_TCP));
const struct {
base::TimeTicks start_timestamp;
bool expect_network_quality_available;
base::TimeDelta expected_http_rtt;
base::TimeDelta expected_transport_rtt;
int32_t expected_downstream_throughput;
EffectiveConnectionType expected_effective_connection_type;
} tests[] = {
{now + base::TimeDelta::FromSeconds(10), false,
base::TimeDelta::FromMilliseconds(0),
base::TimeDelta::FromMilliseconds(0), 0, EFFECTIVE_CONNECTION_TYPE_4G},
{now, true, new_url_rtt, new_tcp_rtt, new_downlink_kbps,
EFFECTIVE_CONNECTION_TYPE_3G},
{old - base::TimeDelta::FromMicroseconds(500), true, old_url_rtt,
old_tcp_rtt, old_downlink_kbps, EFFECTIVE_CONNECTION_TYPE_4G},
};
for (const auto& test : tests) {
base::TimeDelta http_rtt;
base::TimeDelta transport_rtt;
int32_t downstream_throughput_kbps;
EXPECT_EQ(test.expect_network_quality_available,
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
test.start_timestamp, &http_rtt, nullptr));
EXPECT_EQ(
test.expect_network_quality_available,
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
test.start_timestamp, &transport_rtt, nullptr));
EXPECT_EQ(test.expect_network_quality_available,
estimator.GetRecentDownlinkThroughputKbps(
test.start_timestamp, &downstream_throughput_kbps));
if (test.expect_network_quality_available) {
EXPECT_EQ(test.expected_http_rtt, http_rtt);
EXPECT_EQ(test.expected_transport_rtt, transport_rtt);
EXPECT_EQ(test.expected_downstream_throughput,
downstream_throughput_kbps);
EXPECT_EQ(
test.expected_effective_connection_type,
estimator.GetRecentEffectiveConnectionType(test.start_timestamp));
}
}
}
// Tests if the throughput observation is taken correctly when local and network
// requests do not overlap.
TEST_F(NetworkQualityEstimatorTest, TestThroughputNoRequestOverlap) {
base::HistogramTester histogram_tester;
std::map<std::string, std::string> variation_params;
variation_params["throughput_min_requests_in_flight"] = "1";
variation_params["add_default_platform_observations"] = "false";
static const struct {
bool allow_small_localhost_requests;
} tests[] = {
{
false,
},
{
true,
},
};
for (const auto& test : tests) {
TestNetworkQualityEstimator estimator(variation_params,
test.allow_small_localhost_requests,
test.allow_small_localhost_requests,
std::make_unique<BoundTestNetLog>());
base::TimeDelta rtt;
EXPECT_FALSE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
int32_t kbps;
EXPECT_FALSE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
std::unique_ptr<URLRequest> request(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request->SetLoadFlags(request->load_flags() | LOAD_MAIN_FRAME_DEPRECATED);
request->Start();
test_delegate.RunUntilComplete();
// Pump message loop to allow estimator tasks to be processed.
base::RunLoop().RunUntilIdle();
EXPECT_EQ(test.allow_small_localhost_requests,
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(
test.allow_small_localhost_requests,
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
}
}
#if defined(OS_IOS)
// Flaky on iOS: crbug.com/672917.
#define MAYBE_TestEffectiveConnectionTypeObserver \
DISABLED_TestEffectiveConnectionTypeObserver
#else
#define MAYBE_TestEffectiveConnectionTypeObserver \
TestEffectiveConnectionTypeObserver
#endif
// Tests that the effective connection type is computed at the specified
// interval, and that the observers are notified of any change.
TEST_F(NetworkQualityEstimatorTest, MAYBE_TestEffectiveConnectionTypeObserver) {
base::HistogramTester histogram_tester;
base::SimpleTestTickClock tick_clock;
TestEffectiveConnectionTypeObserver observer;
std::map<std::string, std::string> variation_params;
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
estimator.AddEffectiveConnectionTypeObserver(&observer);
// |observer| may be notified as soon as it is added. Run the loop to so that
// the notification to |observer| is finished.
base::RunLoop().RunUntilIdle();
estimator.SetTickClockForTesting(&tick_clock);
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
EXPECT_EQ(0U, observer.effective_connection_types().size());
estimator.SetStartTimeNullHttpRtt(base::TimeDelta::FromMilliseconds(1500));
estimator.set_start_time_null_downlink_throughput_kbps(100000);
tick_clock.Advance(base::TimeDelta::FromMinutes(60));
std::unique_ptr<URLRequest> request(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request->SetLoadFlags(request->load_flags() | LOAD_MAIN_FRAME_DEPRECATED);
request->Start();
test_delegate.RunUntilComplete();
EXPECT_EQ(1U, observer.effective_connection_types().size());
EXPECT_LE(
1, estimator.GetEntriesCount(NetLogEventType::NETWORK_QUALITY_CHANGED));
// Verify the contents of the net log.
EXPECT_EQ(GetNameForEffectiveConnectionType(EFFECTIVE_CONNECTION_TYPE_2G),
estimator.GetNetLogLastStringValue(
NetLogEventType::NETWORK_QUALITY_CHANGED,
"effective_connection_type"));
EXPECT_EQ(1500, estimator.GetNetLogLastIntegerValue(
NetLogEventType::NETWORK_QUALITY_CHANGED, "http_rtt_ms"));
EXPECT_EQ(-1,
estimator.GetNetLogLastIntegerValue(
NetLogEventType::NETWORK_QUALITY_CHANGED, "transport_rtt_ms"));
EXPECT_EQ(100000, estimator.GetNetLogLastIntegerValue(
NetLogEventType::NETWORK_QUALITY_CHANGED,
"downstream_throughput_kbps"));
histogram_tester.ExpectUniqueSample("NQE.MainFrame.EffectiveConnectionType",
EFFECTIVE_CONNECTION_TYPE_2G, 1);
// Next request should not trigger recomputation of effective connection type
// since there has been no change in the clock.
std::unique_ptr<URLRequest> request2(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request2->SetLoadFlags(request->load_flags() | LOAD_MAIN_FRAME_DEPRECATED);
request2->Start();
test_delegate.RunUntilComplete();
EXPECT_EQ(1U, observer.effective_connection_types().size());
// Change in connection type should send out notification to the observers.
estimator.SetStartTimeNullHttpRtt(base::TimeDelta::FromMilliseconds(500));
estimator.SimulateNetworkChange(NetworkChangeNotifier::CONNECTION_WIFI,
"test");
EXPECT_EQ(3U, observer.effective_connection_types().size());
// A change in effective connection type does not trigger notification to the
// observers, since it is not accompanied by any new observation or a network
// change event.
estimator.SetStartTimeNullHttpRtt(base::TimeDelta::FromMilliseconds(100));
EXPECT_EQ(4U, observer.effective_connection_types().size());
TestEffectiveConnectionTypeObserver observer_2;
estimator.AddEffectiveConnectionTypeObserver(&observer_2);
EXPECT_EQ(0U, observer_2.effective_connection_types().size());
base::RunLoop().RunUntilIdle();
// |observer_2| must be notified as soon as it is added.
EXPECT_EQ(1U, observer_2.effective_connection_types().size());
// |observer_3| should not be notified since it unregisters before the
// message loop is run.
TestEffectiveConnectionTypeObserver observer_3;
estimator.AddEffectiveConnectionTypeObserver(&observer_3);
EXPECT_EQ(0U, observer_3.effective_connection_types().size());
estimator.RemoveEffectiveConnectionTypeObserver(&observer_3);
base::RunLoop().RunUntilIdle();
EXPECT_EQ(0U, observer_3.effective_connection_types().size());
}
// Tests that the transport RTT is used for computing the HTTP RTT.
TEST_F(NetworkQualityEstimatorTest, TestTransportRttUsedForHttpRttComputation) {
const struct {
base::TimeDelta http_rtt;
base::TimeDelta transport_rtt;
base::TimeDelta expected_http_rtt;
EffectiveConnectionType expected_type;
} tests[] = {
{
base::TimeDelta::FromMilliseconds(200),
base::TimeDelta::FromMilliseconds(100),
base::TimeDelta::FromMilliseconds(200), EFFECTIVE_CONNECTION_TYPE_4G,
},
{
base::TimeDelta::FromMilliseconds(100),
base::TimeDelta::FromMilliseconds(200),
base::TimeDelta::FromMilliseconds(200), EFFECTIVE_CONNECTION_TYPE_4G,
},
{
base::TimeDelta::FromMilliseconds(100),
base::TimeDelta::FromMilliseconds(4000),
base::TimeDelta::FromMilliseconds(4000),
EFFECTIVE_CONNECTION_TYPE_SLOW_2G,
},
};
for (const auto& test : tests) {
std::map<std::string, std::string> variation_params;
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
base::SimpleTestTickClock tick_clock;
tick_clock.Advance(base::TimeDelta::FromSeconds(1));
estimator.SetTickClockForTesting(&tick_clock);
estimator.SetStartTimeNullHttpRtt(test.http_rtt);
estimator.SetStartTimeNullTransportRtt(test.transport_rtt);
// Minimum number of transport RTT samples that should be present before
// transport RTT estimate can be used to clamp the HTTP RTT.
estimator.SetTransportRTTAtastECTSampleCount(
estimator.params()->http_rtt_transport_rtt_min_count());
// Add one observation to ensure ECT is not computed for each request.
estimator.AddAndNotifyObserversOfRTT(NetworkQualityEstimator::Observation(
test.http_rtt.InMilliseconds(), tick_clock.NowTicks(), INT32_MIN,
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP));
EXPECT_EQ(test.expected_http_rtt, estimator.GetHttpRTT());
EXPECT_EQ(test.transport_rtt, estimator.GetTransportRTT());
EXPECT_EQ(test.expected_type, estimator.GetEffectiveConnectionType());
}
}
// Tests that the end to end RTT is used for computing the lower bound for HTTP
// RTT.
TEST_F(NetworkQualityEstimatorTest, TestEndToEndRttUsedForHttpRttComputation) {
const struct {
base::TimeDelta http_rtt;
base::TimeDelta end_to_end_rtt;
bool is_end_to_end_rtt_sample_count_enough;
base::TimeDelta expected_http_rtt;
EffectiveConnectionType expected_type;
} tests[] = {
{
base::TimeDelta::FromMilliseconds(200),
base::TimeDelta::FromMilliseconds(100), true,
base::TimeDelta::FromMilliseconds(200), EFFECTIVE_CONNECTION_TYPE_4G,
},
{
// |http_rtt| is lower than |end_to_end_rtt|. The HTTP RTT estimate
// should be set to |end_to_end_rtt|.
base::TimeDelta::FromMilliseconds(100),
base::TimeDelta::FromMilliseconds(200), true,
base::TimeDelta::FromMilliseconds(200), EFFECTIVE_CONNECTION_TYPE_4G,
},
{
// Not enough samples. End to End RTT should not be used.
base::TimeDelta::FromMilliseconds(100),
base::TimeDelta::FromMilliseconds(200), false,
base::TimeDelta::FromMilliseconds(100), EFFECTIVE_CONNECTION_TYPE_4G,
},
{
base::TimeDelta::FromMilliseconds(100),
base::TimeDelta::FromMilliseconds(4000), true,
base::TimeDelta::FromMilliseconds(4000),
EFFECTIVE_CONNECTION_TYPE_SLOW_2G,
},
};
for (const auto& test : tests) {
std::map<std::string, std::string> variation_params;
variation_params["add_default_platform_observations"] = "false";
variation_params["use_end_to_end_rtt"] = "true";
TestNetworkQualityEstimator estimator(variation_params);
base::SimpleTestTickClock tick_clock;
tick_clock.Advance(base::TimeDelta::FromSeconds(1));
estimator.SetTickClockForTesting(&tick_clock);
estimator.SetStartTimeNullHttpRtt(test.http_rtt);
estimator.set_start_time_null_end_to_end_rtt(test.end_to_end_rtt);
// Minimum number of end to end RTT samples that should be present before
// transport RTT estimate can be used to clamp the HTTP RTT.
if (test.is_end_to_end_rtt_sample_count_enough) {
estimator.set_start_time_null_end_to_end_rtt_observation_count(
estimator.params()->http_rtt_transport_rtt_min_count());
} else {
estimator.set_start_time_null_end_to_end_rtt_observation_count(
estimator.params()->http_rtt_transport_rtt_min_count() - 1);
}
// Ensure ECT is recomputed.
estimator.RunOneRequest();
EXPECT_EQ(test.expected_http_rtt, estimator.GetHttpRTT().value());
EXPECT_EQ(test.expected_type, estimator.GetEffectiveConnectionType());
}
}
// Tests that the network quality is computed at the specified interval, and
// that the network quality observers are notified of any change.
TEST_F(NetworkQualityEstimatorTest, TestRTTAndThroughputEstimatesObserver) {
base::HistogramTester histogram_tester;
base::SimpleTestTickClock tick_clock;
TestRTTAndThroughputEstimatesObserver observer;
std::map<std::string, std::string> variation_params;
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
estimator.AddRTTAndThroughputEstimatesObserver(&observer);
estimator.SetTickClockForTesting(&tick_clock);
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
EXPECT_EQ(nqe::internal::InvalidRTT(), observer.http_rtt());
EXPECT_EQ(nqe::internal::InvalidRTT(), observer.transport_rtt());
EXPECT_EQ(nqe::internal::INVALID_RTT_THROUGHPUT,
observer.downstream_throughput_kbps());
int notifications_received = observer.notifications_received();
EXPECT_EQ(0, notifications_received);
base::TimeDelta http_rtt(base::TimeDelta::FromMilliseconds(100));
base::TimeDelta transport_rtt(base::TimeDelta::FromMilliseconds(200));
int32_t downstream_throughput_kbps(300);
estimator.SetStartTimeNullHttpRtt(http_rtt);
estimator.SetStartTimeNullTransportRtt(transport_rtt);
estimator.set_start_time_null_downlink_throughput_kbps(
downstream_throughput_kbps);
tick_clock.Advance(base::TimeDelta::FromMinutes(60));
std::unique_ptr<URLRequest> request(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request->Start();
test_delegate.RunUntilComplete();
EXPECT_EQ(http_rtt, observer.http_rtt());
EXPECT_EQ(transport_rtt, observer.transport_rtt());
EXPECT_EQ(downstream_throughput_kbps, observer.downstream_throughput_kbps());
EXPECT_LE(1, observer.notifications_received() - notifications_received);
notifications_received = observer.notifications_received();
// The next request should not trigger recomputation of RTT or throughput
// since there has been no change in the clock.
std::unique_ptr<URLRequest> request2(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request2->Start();
test_delegate.RunUntilComplete();
EXPECT_LE(1, observer.notifications_received() - notifications_received);
notifications_received = observer.notifications_received();
// A change in the connection type should send out notification to the
// observers.
estimator.SimulateNetworkChange(NetworkChangeNotifier::CONNECTION_WIFI,
"test");
EXPECT_EQ(http_rtt, observer.http_rtt());
EXPECT_EQ(transport_rtt, observer.transport_rtt());
EXPECT_EQ(downstream_throughput_kbps, observer.downstream_throughput_kbps());
EXPECT_LE(1, observer.notifications_received() - notifications_received);
notifications_received = observer.notifications_received();
// A change in effective connection type does not trigger notification to the
// observers, since it is not accompanied by any new observation or a network
// change event.
estimator.SetStartTimeNullHttpRtt(base::TimeDelta::FromMilliseconds(10000));
estimator.SetStartTimeNullHttpRtt(base::TimeDelta::FromMilliseconds(1));
EXPECT_EQ(2, observer.notifications_received() - notifications_received);
TestRTTAndThroughputEstimatesObserver observer_2;
estimator.AddRTTAndThroughputEstimatesObserver(&observer_2);
EXPECT_EQ(nqe::internal::InvalidRTT(), observer_2.http_rtt());
EXPECT_EQ(nqe::internal::InvalidRTT(), observer_2.transport_rtt());
EXPECT_EQ(nqe::internal::INVALID_RTT_THROUGHPUT,
observer_2.downstream_throughput_kbps());
base::RunLoop().RunUntilIdle();
EXPECT_NE(nqe::internal::InvalidRTT(), observer_2.http_rtt());
EXPECT_NE(nqe::internal::InvalidRTT(), observer_2.transport_rtt());
EXPECT_NE(nqe::internal::INVALID_RTT_THROUGHPUT,
observer_2.downstream_throughput_kbps());
// |observer_3| should not be notified because it is unregisters before the
// message loop is run.
TestRTTAndThroughputEstimatesObserver observer_3;
estimator.AddRTTAndThroughputEstimatesObserver(&observer_3);
EXPECT_EQ(nqe::internal::InvalidRTT(), observer_3.http_rtt());
EXPECT_EQ(nqe::internal::InvalidRTT(), observer_3.transport_rtt());
EXPECT_EQ(nqe::internal::INVALID_RTT_THROUGHPUT,
observer_3.downstream_throughput_kbps());
estimator.RemoveRTTAndThroughputEstimatesObserver(&observer_3);
base::RunLoop().RunUntilIdle();
EXPECT_EQ(nqe::internal::InvalidRTT(), observer_3.http_rtt());
EXPECT_EQ(nqe::internal::InvalidRTT(), observer_3.transport_rtt());
EXPECT_EQ(nqe::internal::INVALID_RTT_THROUGHPUT,
observer_3.downstream_throughput_kbps());
}
// Tests that the effective connection type is computed on every RTT
// observation if the last computed effective connection type was unknown.
TEST_F(NetworkQualityEstimatorTest, UnknownEffectiveConnectionType) {
base::SimpleTestTickClock tick_clock;
TestEffectiveConnectionTypeObserver observer;
std::map<std::string, std::string> variation_params;
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
estimator.SetTickClockForTesting(&tick_clock);
estimator.AddEffectiveConnectionTypeObserver(&observer);
tick_clock.Advance(base::TimeDelta::FromMinutes(60));
size_t expected_effective_connection_type_notifications = 0;
estimator.set_recent_effective_connection_type(
EFFECTIVE_CONNECTION_TYPE_UNKNOWN);
// Run one main frame request to force recomputation of effective connection
// type.
estimator.RunOneRequest();
estimator.SimulateNetworkChange(NetworkChangeNotifier::CONNECTION_WIFI,
"test");
NetworkQualityEstimator::Observation rtt_observation(
5000, tick_clock.NowTicks(), INT32_MIN,
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP);
for (size_t i = 0; i < 10; ++i) {
estimator.AddAndNotifyObserversOfRTT(rtt_observation);
EXPECT_EQ(expected_effective_connection_type_notifications,
observer.effective_connection_types().size());
}
estimator.set_recent_effective_connection_type(
EFFECTIVE_CONNECTION_TYPE_SLOW_2G);
// Even though there are 10 RTT samples already available, the addition of one
// more RTT sample should trigger recomputation of the effective connection
// type since the last computed effective connection type was unknown.
estimator.AddAndNotifyObserversOfRTT(NetworkQualityEstimator::Observation(
5000, tick_clock.NowTicks(), INT32_MIN,
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP));
++expected_effective_connection_type_notifications;
EXPECT_EQ(expected_effective_connection_type_notifications,
observer.effective_connection_types().size());
}
// Tests that the effective connection type is computed regularly depending
// on the number of RTT and bandwidth samples.
TEST_F(NetworkQualityEstimatorTest,
AdaptiveRecomputationEffectiveConnectionType) {
base::HistogramTester histogram_tester;
base::SimpleTestTickClock tick_clock;
TestEffectiveConnectionTypeObserver observer;
std::map<std::string, std::string> variation_params;
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
estimator.SetTickClockForTesting(&tick_clock);
estimator.SimulateNetworkChange(NetworkChangeNotifier::CONNECTION_WIFI,
"test");
estimator.AddEffectiveConnectionTypeObserver(&observer);
// |observer| may be notified as soon as it is added. Run the loop to so that
// the notification to |observer| is finished.
base::RunLoop().RunUntilIdle();
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
EXPECT_EQ(0U, observer.effective_connection_types().size());
estimator.set_recent_effective_connection_type(EFFECTIVE_CONNECTION_TYPE_2G);
tick_clock.Advance(base::TimeDelta::FromMinutes(60));
std::unique_ptr<URLRequest> request(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request->SetLoadFlags(request->load_flags() | LOAD_MAIN_FRAME_DEPRECATED);
request->Start();
test_delegate.RunUntilComplete();
EXPECT_EQ(1U, observer.effective_connection_types().size());
histogram_tester.ExpectUniqueSample("NQE.MainFrame.EffectiveConnectionType",
EFFECTIVE_CONNECTION_TYPE_2G, 1);
histogram_tester.ExpectUniqueSample("NQE.EstimateAvailable.MainFrame.RTT", 0,
1);
histogram_tester.ExpectUniqueSample(
"NQE.EstimateAvailable.MainFrame.TransportRTT", 0, 1);
histogram_tester.ExpectUniqueSample("NQE.EstimateAvailable.MainFrame.Kbps", 0,
1);
EXPECT_LE(1u,
histogram_tester
.GetAllSamples("NQE.EffectiveConnectionType.OnECTComputation")
.size());
size_t expected_effective_connection_type_notifications = 1;
EXPECT_EQ(expected_effective_connection_type_notifications,
observer.effective_connection_types().size());
EXPECT_EQ(
expected_effective_connection_type_notifications,
(estimator.rtt_ms_observations_[nqe::internal::OBSERVATION_CATEGORY_HTTP]
.Size() +
estimator
.rtt_ms_observations_[nqe::internal::OBSERVATION_CATEGORY_TRANSPORT]
.Size()));
// Increase the number of RTT observations. Every time the number of RTT
// observations is more than doubled, effective connection type must be
// recomputed and notified to observers.
for (size_t repetition = 0; repetition < 2; ++repetition) {
// Change the effective connection type so that the observers are
// notified when the effective connection type is recomputed.
if (repetition % 2 == 0) {
estimator.set_recent_effective_connection_type(
EFFECTIVE_CONNECTION_TYPE_SLOW_2G);
} else {
estimator.set_recent_effective_connection_type(
EFFECTIVE_CONNECTION_TYPE_3G);
}
size_t rtt_observations_count =
(estimator
.rtt_ms_observations_[nqe::internal::OBSERVATION_CATEGORY_HTTP]
.Size() +
estimator
.rtt_ms_observations_
[nqe::internal::OBSERVATION_CATEGORY_TRANSPORT]
.Size()) *
0.5;
// Increase the number of RTT observations to more than twice the number
// of current observations. This should trigger recomputation of
// effective connection type.
for (size_t i = 0; i < rtt_observations_count + 1; ++i) {
estimator.AddAndNotifyObserversOfRTT(NetworkQualityEstimator::Observation(
5000, tick_clock.NowTicks(), INT32_MIN,
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP));
if (i == rtt_observations_count) {
// Effective connection type must be recomputed since the number of RTT
// samples are now more than twice the number of RTT samples that were
// available when effective connection type was last computed.
++expected_effective_connection_type_notifications;
}
EXPECT_EQ(expected_effective_connection_type_notifications,
observer.effective_connection_types().size());
}
}
}
TEST_F(NetworkQualityEstimatorTest, TestRttThroughputObservers) {
base::HistogramTester histogram_tester;
TestRTTObserver rtt_observer;
TestThroughputObserver throughput_observer;
std::map<std::string, std::string> variation_params;
variation_params["throughput_min_requests_in_flight"] = "1";
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
estimator.AddRTTObserver(&rtt_observer);
estimator.AddThroughputObserver(&throughput_observer);
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
EXPECT_EQ(0U, rtt_observer.observations().size());
EXPECT_EQ(0U, throughput_observer.observations().size());
base::TimeTicks then = base::TimeTicks::Now();
std::unique_ptr<URLRequest> request(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request->SetLoadFlags(request->load_flags() | LOAD_MAIN_FRAME_DEPRECATED);
request->Start();
test_delegate.RunUntilComplete();
std::unique_ptr<URLRequest> request2(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request2->SetLoadFlags(request->load_flags() | LOAD_MAIN_FRAME_DEPRECATED);
request2->Start();
test_delegate.RunUntilComplete();
// Pump message loop to allow estimator tasks to be processed.
base::RunLoop().RunUntilIdle();
// Both RTT and downstream throughput should be updated.
base::TimeDelta rtt;
EXPECT_TRUE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
int32_t throughput;
EXPECT_TRUE(estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(),
&throughput));
EXPECT_EQ(2U, rtt_observer.observations().size());
EXPECT_EQ(2U, throughput_observer.observations().size());
for (const auto& observation : rtt_observer.observations()) {
EXPECT_LE(0, observation.rtt_ms);
EXPECT_LE(0, (observation.timestamp - then).InMilliseconds());
EXPECT_EQ(NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP, observation.source);
}
for (const auto& observation : throughput_observer.observations()) {
EXPECT_LE(0, observation.throughput_kbps);
EXPECT_LE(0, (observation.timestamp - then).InMilliseconds());
EXPECT_EQ(NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP, observation.source);
}
EXPECT_FALSE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
base::TimeTicks(), &rtt, nullptr));
// Verify that observations from TCP and QUIC are passed on to the observers.
base::TimeDelta tcp_rtt(base::TimeDelta::FromMilliseconds(1));
base::TimeDelta quic_rtt(base::TimeDelta::FromMilliseconds(2));
// Use a public IP address so that the socket watcher runs the RTT callback.
IPAddressList ip_list;
IPAddress ip_address;
ASSERT_TRUE(ip_address.AssignFromIPLiteral("157.0.0.1"));
ip_list.push_back(ip_address);
AddressList address_list =
AddressList::CreateFromIPAddressList(ip_list, "canonical.example.com");
std::unique_ptr<SocketPerformanceWatcher> tcp_watcher =
estimator.GetSocketPerformanceWatcherFactory()
->CreateSocketPerformanceWatcher(
SocketPerformanceWatcherFactory::PROTOCOL_TCP, address_list);
std::unique_ptr<SocketPerformanceWatcher> quic_watcher =
estimator.GetSocketPerformanceWatcherFactory()
->CreateSocketPerformanceWatcher(
SocketPerformanceWatcherFactory::PROTOCOL_QUIC, address_list);
tcp_watcher->OnUpdatedRTTAvailable(tcp_rtt);
// First RTT sample from QUIC connections is dropped, but the second RTT
// notification should not be dropped.
quic_watcher->OnUpdatedRTTAvailable(quic_rtt);
quic_watcher->OnUpdatedRTTAvailable(quic_rtt);
base::RunLoop().RunUntilIdle();
EXPECT_EQ(4U, rtt_observer.observations().size());
EXPECT_EQ(2U, throughput_observer.observations().size());
EXPECT_EQ(tcp_rtt.InMilliseconds(), rtt_observer.observations().at(2).rtt_ms);
EXPECT_EQ(quic_rtt.InMilliseconds(),
rtt_observer.observations().at(3).rtt_ms);
EXPECT_TRUE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(quic_rtt, estimator.end_to_end_rtt_.value());
EXPECT_LT(
0u, estimator.end_to_end_rtt_observation_count_at_last_ect_computation_);
const std::vector<base::Bucket> end_to_end_rtt_samples =
histogram_tester.GetAllSamples("NQE.EndToEndRTT.OnECTComputation");
EXPECT_FALSE(end_to_end_rtt_samples.empty());
for (const auto& bucket : end_to_end_rtt_samples)
EXPECT_EQ(quic_rtt.InMilliseconds(), bucket.min);
}
TEST_F(NetworkQualityEstimatorTest, TestGlobalSocketWatcherThrottle) {
base::SimpleTestTickClock tick_clock;
tick_clock.Advance(base::TimeDelta::FromSeconds(1));
std::map<std::string, std::string> variation_params;
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
estimator.SetTickClockForTesting(&tick_clock);
TestRTTObserver rtt_observer;
estimator.AddRTTObserver(&rtt_observer);
const base::TimeDelta tcp_rtt(base::TimeDelta::FromMilliseconds(1));
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
// Use a public IP address so that the socket watcher runs the RTT callback.
IPAddressList ip_list;
IPAddress ip_address;
ASSERT_TRUE(ip_address.AssignFromIPLiteral("157.0.0.1"));
ip_list.push_back(ip_address);
AddressList address_list =
AddressList::CreateFromIPAddressList(ip_list, "canonical.example.com");
std::unique_ptr<SocketPerformanceWatcher> tcp_watcher =
estimator.GetSocketPerformanceWatcherFactory()
->CreateSocketPerformanceWatcher(
SocketPerformanceWatcherFactory::PROTOCOL_TCP, address_list);
EXPECT_EQ(0U, rtt_observer.observations().size());
EXPECT_TRUE(tcp_watcher->ShouldNotifyUpdatedRTT());
std::unique_ptr<URLRequest> request(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request->SetLoadFlags(request->load_flags() | LOAD_MAIN_FRAME_DEPRECATED);
request->Start();
test_delegate.RunUntilComplete();
EXPECT_EQ(1U, rtt_observer.observations().size());
EXPECT_TRUE(tcp_watcher->ShouldNotifyUpdatedRTT());
tcp_watcher->OnUpdatedRTTAvailable(tcp_rtt);
base::RunLoop().RunUntilIdle();
EXPECT_FALSE(tcp_watcher->ShouldNotifyUpdatedRTT());
EXPECT_EQ(2U, rtt_observer.observations().size());
// Advancing the clock should make it possible to notify new RTT
// notifications.
tick_clock.Advance(
estimator.params()->socket_watchers_min_notification_interval());
EXPECT_TRUE(tcp_watcher->ShouldNotifyUpdatedRTT());
EXPECT_EQ(tcp_rtt.InMilliseconds(), rtt_observer.observations().at(1).rtt_ms);
base::TimeDelta rtt;
EXPECT_TRUE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
base::TimeTicks(), &rtt, nullptr));
}
// TestTCPSocketRTT requires kernel support for tcp_info struct, and so it is
// enabled only on certain platforms.
#if defined(TCP_INFO) || (defined(OS_LINUX) && !defined(OS_CHROMEOS)) || \
defined(OS_ANDROID)
#define MAYBE_TestTCPSocketRTT TestTCPSocketRTT
#else
#define MAYBE_TestTCPSocketRTT DISABLED_TestTCPSocketRTT
#endif
// Tests that the TCP socket notifies the Network Quality Estimator of TCP RTTs,
// which in turn notifies registered RTT observers.
TEST_F(NetworkQualityEstimatorTest, MAYBE_TestTCPSocketRTT) {
base::SimpleTestTickClock tick_clock;
tick_clock.Advance(base::TimeDelta::FromSeconds(1));
base::HistogramTester histogram_tester;
TestRTTObserver rtt_observer;
std::map<std::string, std::string> variation_params;
variation_params["persistent_cache_reading_enabled"] = "true";
variation_params["throughput_min_requests_in_flight"] = "1";
TestNetworkQualityEstimator estimator(variation_params, true, true,
std::make_unique<BoundTestNetLog>());
estimator.SetTickClockForTesting(&tick_clock);
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_2G, "test");
estimator.AddRTTObserver(&rtt_observer);
// |observer| may be notified as soon as it is added. Run the loop to so that
// the notification to |observer| is finished.
base::RunLoop().RunUntilIdle();
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
std::unique_ptr<HttpNetworkSession::Context> session_context(
new HttpNetworkSession::Context);
// |estimator| should be notified of TCP RTT observations.
session_context->socket_performance_watcher_factory =
estimator.GetSocketPerformanceWatcherFactory();
context.set_http_network_session_context(std::move(session_context));
context.Init();
EXPECT_EQ(0U, rtt_observer.observations().size());
base::TimeDelta rtt;
EXPECT_TRUE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(rtt, estimator.GetHttpRTT().value());
EXPECT_TRUE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(rtt, estimator.GetTransportRTT().value());
// Send two requests. Verify that the completion of each request generates at
// least one TCP RTT observation.
const size_t num_requests = 2;
for (size_t i = 0; i < num_requests; ++i) {
size_t before_count_tcp_rtt_observations = 0;
for (const auto& observation : rtt_observer.observations()) {
if (observation.source == NETWORK_QUALITY_OBSERVATION_SOURCE_TCP)
++before_count_tcp_rtt_observations;
}
std::unique_ptr<URLRequest> request(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request->SetLoadFlags(request->load_flags() | LOAD_MAIN_FRAME_DEPRECATED);
request->Start();
tick_clock.Advance(
estimator.params()->socket_watchers_min_notification_interval());
test_delegate.RunUntilComplete();
size_t after_count_tcp_rtt_observations = 0;
for (const auto& observation : rtt_observer.observations()) {
if (observation.source == NETWORK_QUALITY_OBSERVATION_SOURCE_TCP)
++after_count_tcp_rtt_observations;
}
// At least one notification should be received per socket performance
// watcher.
EXPECT_LE(1U, after_count_tcp_rtt_observations -
before_count_tcp_rtt_observations)
<< i;
}
EXPECT_TRUE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_NE(nqe::internal::InvalidRTT(), estimator.GetHttpRTT().value());
EXPECT_TRUE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(rtt, estimator.GetTransportRTT().value());
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, "test-1");
// Verify that metrics are logged correctly on main-frame requests.
histogram_tester.ExpectTotalCount("NQE.MainFrame.TransportRTT.Percentile50",
num_requests);
histogram_tester.ExpectUniqueSample("NQE.EstimateAvailable.MainFrame.RTT", 1,
num_requests);
histogram_tester.ExpectUniqueSample(
"NQE.EstimateAvailable.MainFrame.TransportRTT", 1, num_requests);
histogram_tester.ExpectUniqueSample("NQE.EstimateAvailable.MainFrame.Kbps", 1,
num_requests);
histogram_tester.ExpectTotalCount("NQE.MainFrame.EffectiveConnectionType",
num_requests);
histogram_tester.ExpectBucketCount("NQE.MainFrame.EffectiveConnectionType",
EFFECTIVE_CONNECTION_TYPE_UNKNOWN, 0);
ExpectBucketCountAtLeast(&histogram_tester, "NQE.RTT.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_TCP, 1);
ExpectBucketCountAtLeast(&histogram_tester, "NQE.Kbps.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP, 1);
EXPECT_LE(1u,
histogram_tester
.GetAllSamples("NQE.EffectiveConnectionType.OnECTComputation")
.size());
EXPECT_LE(1u,
histogram_tester.GetAllSamples("NQE.TransportRTT.OnECTComputation")
.size());
EXPECT_LE(1u,
histogram_tester.GetAllSamples("NQE.RTT.OnECTComputation").size());
histogram_tester.ExpectBucketCount(
"NQE.Kbps.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_TRANSPORT_CACHED_ESTIMATE, 0);
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_2G, "test");
histogram_tester.ExpectBucketCount(
"NQE.RTT.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_TRANSPORT_CACHED_ESTIMATE, 1);
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, "test-1");
histogram_tester.ExpectBucketCount(
"NQE.RTT.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_TRANSPORT_CACHED_ESTIMATE, 2);
}
#if defined(OS_IOS)
// Flaky on iOS when |accuracy_recording_delay| is non-zero.
#define MAYBE_RecordAccuracy DISABLED_RecordAccuracy
#else
#define MAYBE_RecordAccuracy RecordAccuracy
#endif
// Tests if the NQE accuracy metrics are recorded properly.
TEST_F(NetworkQualityEstimatorTest, MAYBE_RecordAccuracy) {
const int expected_rtt_msec = 500;
const int expected_downstream_throughput_kbps = 2000;
const base::TimeDelta accuracy_recording_delays[] = {
base::TimeDelta::FromSeconds(0), base::TimeDelta::FromSeconds(1),
};
const struct {
base::TimeDelta rtt;
base::TimeDelta recent_rtt;
int32_t downstream_throughput_kbps;
int32_t recent_downstream_throughput_kbps;
EffectiveConnectionType effective_connection_type;
EffectiveConnectionType recent_effective_connection_type;
} tests[] = {
{base::TimeDelta::FromMilliseconds(expected_rtt_msec),
base::TimeDelta::FromMilliseconds(expected_rtt_msec),
expected_downstream_throughput_kbps, expected_downstream_throughput_kbps,
EFFECTIVE_CONNECTION_TYPE_3G, EFFECTIVE_CONNECTION_TYPE_3G},
{
base::TimeDelta::FromMilliseconds(expected_rtt_msec + 1000),
base::TimeDelta::FromMilliseconds(expected_rtt_msec),
expected_downstream_throughput_kbps - 1,
expected_downstream_throughput_kbps, EFFECTIVE_CONNECTION_TYPE_2G,
EFFECTIVE_CONNECTION_TYPE_3G,
},
{
base::TimeDelta::FromMilliseconds(expected_rtt_msec - 400),
base::TimeDelta::FromMilliseconds(expected_rtt_msec),
expected_downstream_throughput_kbps + 1,
expected_downstream_throughput_kbps, EFFECTIVE_CONNECTION_TYPE_4G,
EFFECTIVE_CONNECTION_TYPE_3G,
},
};
for (const auto& accuracy_recording_delay : accuracy_recording_delays) {
for (const auto& test : tests) {
base::SimpleTestTickClock tick_clock;
tick_clock.Advance(base::TimeDelta::FromSeconds(1));
std::map<std::string, std::string> variation_params;
TestNetworkQualityEstimator estimator(variation_params);
estimator.SetTickClockForTesting(&tick_clock);
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, "test-1");
tick_clock.Advance(base::TimeDelta::FromSeconds(1));
std::vector<base::TimeDelta> accuracy_recording_intervals;
accuracy_recording_intervals.push_back(accuracy_recording_delay);
estimator.SetAccuracyRecordingIntervals(accuracy_recording_intervals);
// RTT is higher than threshold. Network is slow.
// Network was predicted to be slow and actually was slow.
estimator.SetStartTimeNullHttpRtt(test.rtt);
estimator.set_recent_http_rtt(test.recent_rtt);
estimator.set_rtt_estimate_internal(test.recent_rtt);
estimator.SetStartTimeNullTransportRtt(test.rtt);
estimator.set_recent_transport_rtt(test.recent_rtt);
estimator.set_start_time_null_downlink_throughput_kbps(
test.downstream_throughput_kbps);
estimator.set_recent_downlink_throughput_kbps(
test.recent_downstream_throughput_kbps);
base::HistogramTester histogram_tester;
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
// Start a main-frame request which should cause network quality estimator
// to record accuracy UMA.
std::unique_ptr<URLRequest> request(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request->SetLoadFlags(request->load_flags() | LOAD_MAIN_FRAME_DEPRECATED);
request->Start();
test_delegate.RunUntilComplete();
if (accuracy_recording_delay != base::TimeDelta()) {
tick_clock.Advance(accuracy_recording_delay);
// Sleep for some time to ensure that the delayed task is posted.
base::PlatformThread::Sleep(accuracy_recording_delay * 2);
base::RunLoop().RunUntilIdle();
}
const int rtt_diff = std::abs(test.rtt.InMilliseconds() -
test.recent_rtt.InMilliseconds());
const int kbps_diff = std::abs(test.downstream_throughput_kbps -
test.recent_downstream_throughput_kbps);
const int ect_diff = std::abs(test.effective_connection_type -
test.recent_effective_connection_type);
const std::string rtt_sign_suffix_with_zero_samples =
test.rtt.InMilliseconds() - test.recent_rtt.InMilliseconds() >= 0
? "Negative"
: "Positive";
const std::string kbps_sign_suffix_with_zero_samples =
test.downstream_throughput_kbps -
test.recent_downstream_throughput_kbps >=
0
? "Negative"
: "Positive";
const std::string rtt_sign_suffix_with_one_sample =
rtt_sign_suffix_with_zero_samples == "Positive" ? "Negative"
: "Positive";
const std::string ect_sign_suffix_with_zero_samples =
test.rtt.InMilliseconds() - test.recent_rtt.InMilliseconds() > 0
? "Positive"
: "Negative";
const std::string kbps_sign_suffix_with_one_sample =
kbps_sign_suffix_with_zero_samples == "Positive" ? "Negative"
: "Positive";
const std::string ect_sign_suffix_with_one_sample =
ect_sign_suffix_with_zero_samples == "Positive" ? "Negative"
: "Positive";
const std::string interval_value =
base::IntToString(accuracy_recording_delay.InSeconds());
histogram_tester.ExpectUniqueSample(
"NQE.Accuracy.DownstreamThroughputKbps.EstimatedObservedDiff." +
kbps_sign_suffix_with_one_sample + "." + interval_value +
".1260_2540",
kbps_diff, 1);
histogram_tester.ExpectTotalCount(
"NQE.Accuracy.DownstreamThroughputKbps.EstimatedObservedDiff." +
kbps_sign_suffix_with_zero_samples + "." + interval_value +
".1260_2540",
0);
histogram_tester.ExpectUniqueSample(
"NQE.Accuracy.EffectiveConnectionType.EstimatedObservedDiff." +
ect_sign_suffix_with_one_sample + "." + interval_value + ".3G",
ect_diff, 1);
histogram_tester.ExpectTotalCount(
"NQE.Accuracy.EffectiveConnectionType.EstimatedObservedDiff." +
ect_sign_suffix_with_zero_samples + "." + interval_value + ".3G",
0);
histogram_tester.ExpectUniqueSample(
"NQE.Accuracy.HttpRTT.EstimatedObservedDiff." +
rtt_sign_suffix_with_one_sample + "." + interval_value +
".300_620",
rtt_diff, 1);
histogram_tester.ExpectTotalCount(
"NQE.Accuracy.HttpRTT.EstimatedObservedDiff." +
rtt_sign_suffix_with_zero_samples + "." + interval_value +
".300_620",
0);
histogram_tester.ExpectUniqueSample(
"NQE.Accuracy.TransportRTT.EstimatedObservedDiff." +
rtt_sign_suffix_with_one_sample + "." + interval_value +
".300_620",
rtt_diff, 1);
histogram_tester.ExpectTotalCount(
"NQE.Accuracy.TransportRTT.EstimatedObservedDiff." +
rtt_sign_suffix_with_zero_samples + "." + interval_value +
".300_620",
0);
}
}
}
TEST_F(NetworkQualityEstimatorTest, TestRecordNetworkIDAvailability) {
base::HistogramTester histogram_tester;
TestNetworkQualityEstimator estimator;
// The NetworkID is recorded as available on Wi-Fi connection.
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, "test-1");
histogram_tester.ExpectUniqueSample("NQE.NetworkIdAvailable", 1, 1);
// The histogram is not recorded on an unknown connection.
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_UNKNOWN, "");
histogram_tester.ExpectTotalCount("NQE.NetworkIdAvailable", 1);
// The NetworkID is recorded as not being available on a Wi-Fi connection
// with an empty SSID.
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, "");
histogram_tester.ExpectBucketCount("NQE.NetworkIdAvailable", 0, 1);
histogram_tester.ExpectTotalCount("NQE.NetworkIdAvailable", 2);
// The NetworkID is recorded as being available on a Wi-Fi connection.
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, "test-1");
histogram_tester.ExpectBucketCount("NQE.NetworkIdAvailable", 1, 2);
histogram_tester.ExpectTotalCount("NQE.NetworkIdAvailable", 3);
// The NetworkID is recorded as being available on a cellular connection.
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_2G, "test-1");
histogram_tester.ExpectBucketCount("NQE.NetworkIdAvailable", 1, 3);
histogram_tester.ExpectTotalCount("NQE.NetworkIdAvailable", 4);
}
class TestNetworkQualitiesCacheObserver
: public nqe::internal::NetworkQualityStore::NetworkQualitiesCacheObserver {
public:
TestNetworkQualitiesCacheObserver()
: network_id_(net::NetworkChangeNotifier::CONNECTION_UNKNOWN,
std::string(),
INT32_MIN),
notification_received_(0) {}
~TestNetworkQualitiesCacheObserver() override = default;
void OnChangeInCachedNetworkQuality(
const nqe::internal::NetworkID& network_id,
const nqe::internal::CachedNetworkQuality& cached_network_quality)
override {
network_id_ = network_id;
notification_received_++;
}
size_t get_notification_received_and_reset() {
size_t notification_received = notification_received_;
notification_received_ = 0;
return notification_received;
}
nqe::internal::NetworkID network_id() const { return network_id_; }
private:
nqe::internal::NetworkID network_id_;
size_t notification_received_;
DISALLOW_COPY_AND_ASSIGN(TestNetworkQualitiesCacheObserver);
};
TEST_F(NetworkQualityEstimatorTest, CacheObserver) {
TestNetworkQualitiesCacheObserver observer;
TestNetworkQualityEstimator estimator;
// Add |observer| as a persistent caching observer.
estimator.AddNetworkQualitiesCacheObserver(&observer);
estimator.set_recent_effective_connection_type(EFFECTIVE_CONNECTION_TYPE_3G);
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_UNKNOWN, "test3g");
estimator.RunOneRequest();
EXPECT_EQ(4u, observer.get_notification_received_and_reset());
EXPECT_EQ("test3g", observer.network_id().id);
estimator.set_recent_effective_connection_type(EFFECTIVE_CONNECTION_TYPE_2G);
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_2G, "test2g");
// One notification should be received for the previous network
// ("test3g") right before the connection change event. The second
// notification should be received for the second network ("test2g").
base::RunLoop().RunUntilIdle();
EXPECT_EQ(2u, observer.get_notification_received_and_reset());
estimator.RunOneRequest();
EXPECT_EQ("test2g", observer.network_id().id);
estimator.set_recent_effective_connection_type(EFFECTIVE_CONNECTION_TYPE_4G);
// Start multiple requests, but there should be only one notification
// received, since the effective connection type does not change.
estimator.RunOneRequest();
estimator.RunOneRequest();
estimator.RunOneRequest();
EXPECT_EQ(1u, observer.get_notification_received_and_reset());
estimator.set_recent_effective_connection_type(EFFECTIVE_CONNECTION_TYPE_2G);
estimator.RunOneRequest();
EXPECT_EQ(1u, observer.get_notification_received_and_reset());
// Remove |observer|, and it should not receive any notifications.
estimator.RemoveNetworkQualitiesCacheObserver(&observer);
estimator.set_recent_effective_connection_type(EFFECTIVE_CONNECTION_TYPE_3G);
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_2G, "test2g");
EXPECT_EQ(0u, observer.get_notification_received_and_reset());
estimator.RunOneRequest();
EXPECT_EQ(0u, observer.get_notification_received_and_reset());
}
// Tests that the value of the effective connection type can be forced through
// field trial parameters.
TEST_F(NetworkQualityEstimatorTest,
ForceEffectiveConnectionTypeThroughFieldTrial) {
for (int i = 0; i < EFFECTIVE_CONNECTION_TYPE_LAST; ++i) {
EffectiveConnectionType ect_type = static_cast<EffectiveConnectionType>(i);
std::map<std::string, std::string> variation_params;
variation_params[kForceEffectiveConnectionType] =
GetNameForEffectiveConnectionType(
static_cast<EffectiveConnectionType>(i));
TestNetworkQualityEstimator estimator(variation_params);
TestEffectiveConnectionTypeObserver ect_observer;
estimator.AddEffectiveConnectionTypeObserver(&ect_observer);
TestRTTAndThroughputEstimatesObserver rtt_throughput_observer;
estimator.AddRTTAndThroughputEstimatesObserver(&rtt_throughput_observer);
// |observer| may be notified as soon as it is added. Run the loop to so
// that the notification to |observer| is finished.
base::RunLoop().RunUntilIdle();
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
if (ect_type == EFFECTIVE_CONNECTION_TYPE_UNKNOWN) {
EXPECT_EQ(0U, ect_observer.effective_connection_types().size());
} else {
EXPECT_EQ(1U, ect_observer.effective_connection_types().size());
}
std::unique_ptr<URLRequest> request(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request->SetLoadFlags(request->load_flags() | LOAD_MAIN_FRAME_DEPRECATED);
request->Start();
test_delegate.RunUntilComplete();
// Pump message loop to allow estimator tasks to be processed.
base::RunLoop().RunUntilIdle();
EXPECT_EQ(i, estimator.GetEffectiveConnectionType());
size_t expected_count =
ect_type == EFFECTIVE_CONNECTION_TYPE_UNKNOWN ? 0 : 1;
ASSERT_EQ(expected_count, ect_observer.effective_connection_types().size());
if (expected_count == 1) {
EffectiveConnectionType last_notified_type =
ect_observer.effective_connection_types().at(
ect_observer.effective_connection_types().size() - 1);
EXPECT_EQ(i, last_notified_type);
if (ect_type == EFFECTIVE_CONNECTION_TYPE_UNKNOWN ||
ect_type == EFFECTIVE_CONNECTION_TYPE_OFFLINE) {
EXPECT_EQ(nqe::internal::InvalidRTT(),
rtt_throughput_observer.http_rtt());
EXPECT_EQ(nqe::internal::InvalidRTT(),
rtt_throughput_observer.transport_rtt());
EXPECT_EQ(nqe::internal::INVALID_RTT_THROUGHPUT,
rtt_throughput_observer.downstream_throughput_kbps());
} else {
EXPECT_EQ(estimator.params_->TypicalNetworkQuality(ect_type).http_rtt(),
rtt_throughput_observer.http_rtt());
EXPECT_EQ(
estimator.params_->TypicalNetworkQuality(ect_type).transport_rtt(),
rtt_throughput_observer.transport_rtt());
EXPECT_EQ(estimator.params_->TypicalNetworkQuality(ect_type)
.downstream_throughput_kbps(),
rtt_throughput_observer.downstream_throughput_kbps());
}
}
}
}
// Tests that the value of the effective connection type can be forced after
// network quality estimator has been initialized.
TEST_F(NetworkQualityEstimatorTest, SimulateNetworkQualityChangeForTesting) {
for (int i = 0; i < EFFECTIVE_CONNECTION_TYPE_LAST; ++i) {
EffectiveConnectionType ect_type = static_cast<EffectiveConnectionType>(i);
TestNetworkQualityEstimator estimator;
TestEffectiveConnectionTypeObserver ect_observer;
estimator.AddEffectiveConnectionTypeObserver(&ect_observer);
// |observer| may be notified as soon as it is added. Run the loop to so
// that the notification to |observer| is finished.
base::RunLoop().RunUntilIdle();
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
estimator.SimulateNetworkQualityChangeForTesting(ect_type);
base::RunLoop().RunUntilIdle();
EXPECT_EQ(ect_type, ect_observer.effective_connection_types().back());
}
}
// Test that the typical network qualities are set correctly.
TEST_F(NetworkQualityEstimatorTest, TypicalNetworkQualities) {
TestNetworkQualityEstimator estimator;
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
for (size_t effective_connection_type = EFFECTIVE_CONNECTION_TYPE_SLOW_2G;
effective_connection_type <= EFFECTIVE_CONNECTION_TYPE_4G;
++effective_connection_type) {
// Set the RTT and throughput values to the typical values for
// |effective_connection_type|. The effective connection type should be
// computed as |effective_connection_type|.
estimator.SetStartTimeNullHttpRtt(
estimator.params_
->TypicalNetworkQuality(
static_cast<EffectiveConnectionType>(effective_connection_type))
.http_rtt());
estimator.set_start_time_null_downlink_throughput_kbps(INT32_MAX);
estimator.SetStartTimeNullTransportRtt(
estimator.params_
->TypicalNetworkQuality(
static_cast<EffectiveConnectionType>(effective_connection_type))
.transport_rtt());
EXPECT_EQ(effective_connection_type,
static_cast<size_t>(estimator.GetEffectiveConnectionType()));
}
}
// Verify that the cached network qualities from the prefs are correctly used.
TEST_F(NetworkQualityEstimatorTest, OnPrefsRead) {
base::HistogramTester histogram_tester;
// Construct the read prefs.
std::map<nqe::internal::NetworkID, nqe::internal::CachedNetworkQuality>
read_prefs;
read_prefs[nqe::internal::NetworkID(NetworkChangeNotifier::CONNECTION_WIFI,
"test_ect_2g", INT32_MIN)] =
nqe::internal::CachedNetworkQuality(EFFECTIVE_CONNECTION_TYPE_2G);
read_prefs[nqe::internal::NetworkID(NetworkChangeNotifier::CONNECTION_WIFI,
"test_ect_slow_2g", INT32_MIN)] =
nqe::internal::CachedNetworkQuality(EFFECTIVE_CONNECTION_TYPE_SLOW_2G);
read_prefs[nqe::internal::NetworkID(NetworkChangeNotifier::CONNECTION_4G,
"test_ect_4g", INT32_MIN)] =
nqe::internal::CachedNetworkQuality(EFFECTIVE_CONNECTION_TYPE_4G);
std::map<std::string, std::string> variation_params;
variation_params["persistent_cache_reading_enabled"] = "true";
variation_params["add_default_platform_observations"] = "false";
// Disable default platform values so that the effect of cached estimates
// at the time of startup can be studied in isolation.
TestNetworkQualityEstimator estimator(variation_params, true, true,
std::make_unique<BoundTestNetLog>());
// Add observers.
TestRTTObserver rtt_observer;
TestThroughputObserver throughput_observer;
TestRTTAndThroughputEstimatesObserver rtt_throughput_observer;
TestEffectiveConnectionTypeObserver effective_connection_type_observer;
estimator.AddRTTObserver(&rtt_observer);
estimator.AddThroughputObserver(&throughput_observer);
estimator.AddRTTAndThroughputEstimatesObserver(&rtt_throughput_observer);
estimator.AddEffectiveConnectionTypeObserver(
&effective_connection_type_observer);
std::string network_name("test_ect_2g");
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, network_name);
EXPECT_EQ(0u, rtt_observer.observations().size());
EXPECT_EQ(0u, throughput_observer.observations().size());
EXPECT_LE(0, rtt_throughput_observer.notifications_received());
// Simulate reading of prefs.
estimator.OnPrefsRead(read_prefs);
histogram_tester.ExpectUniqueSample("NQE.Prefs.ReadSize", read_prefs.size(),
1);
// Taken from network_quality_estimator_params.cc.
EXPECT_EQ(base::TimeDelta::FromMilliseconds(1800),
rtt_observer.last_rtt(
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP_CACHED_ESTIMATE));
EXPECT_EQ(base::TimeDelta::FromMilliseconds(1500),
rtt_observer.last_rtt(
NETWORK_QUALITY_OBSERVATION_SOURCE_TRANSPORT_CACHED_ESTIMATE));
EXPECT_EQ(1u, throughput_observer.observations().size());
EXPECT_EQ(base::TimeDelta::FromMilliseconds(1800),
rtt_throughput_observer.http_rtt());
EXPECT_EQ(base::TimeDelta::FromMilliseconds(1500),
rtt_throughput_observer.transport_rtt());
EXPECT_EQ(75, rtt_throughput_observer.downstream_throughput_kbps());
EXPECT_LE(
1u,
effective_connection_type_observer.effective_connection_types().size());
// Compare the ECT stored in prefs with the observer's last entry.
EXPECT_EQ(
read_prefs[nqe::internal::NetworkID(
NetworkChangeNotifier::CONNECTION_WIFI, network_name,
INT32_MIN)]
.effective_connection_type(),
effective_connection_type_observer.effective_connection_types().back());
// Change to a different connection type.
network_name = "test_ect_slow_2g";
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, network_name);
EXPECT_EQ(base::TimeDelta::FromMilliseconds(3600),
rtt_observer.last_rtt(
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP_CACHED_ESTIMATE));
EXPECT_EQ(base::TimeDelta::FromMilliseconds(3000),
rtt_observer.last_rtt(
NETWORK_QUALITY_OBSERVATION_SOURCE_TRANSPORT_CACHED_ESTIMATE));
EXPECT_EQ(2U, throughput_observer.observations().size());
EXPECT_EQ(base::TimeDelta::FromMilliseconds(3600),
rtt_throughput_observer.http_rtt());
EXPECT_EQ(base::TimeDelta::FromMilliseconds(3000),
rtt_throughput_observer.transport_rtt());
EXPECT_EQ(40, rtt_throughput_observer.downstream_throughput_kbps());
EXPECT_LE(
2u,
effective_connection_type_observer.effective_connection_types().size());
// Compare with the last entry.
EXPECT_EQ(
read_prefs[nqe::internal::NetworkID(
NetworkChangeNotifier::CONNECTION_WIFI, network_name,
INT32_MIN)]
.effective_connection_type(),
effective_connection_type_observer.effective_connection_types().back());
// Cleanup.
estimator.RemoveRTTObserver(&rtt_observer);
estimator.RemoveThroughputObserver(&throughput_observer);
estimator.RemoveRTTAndThroughputEstimatesObserver(&rtt_throughput_observer);
estimator.RemoveEffectiveConnectionTypeObserver(
&effective_connection_type_observer);
}
// Verify that the cached network qualities from the prefs are not used if the
// reading of the network quality prefs is not enabled..
TEST_F(NetworkQualityEstimatorTest, OnPrefsReadWithReadingDisabled) {
base::HistogramTester histogram_tester;
// Construct the read prefs.
std::map<nqe::internal::NetworkID, nqe::internal::CachedNetworkQuality>
read_prefs;
read_prefs[nqe::internal::NetworkID(NetworkChangeNotifier::CONNECTION_WIFI,
"test_ect_2g", INT32_MIN)] =
nqe::internal::CachedNetworkQuality(EFFECTIVE_CONNECTION_TYPE_2G);
read_prefs[nqe::internal::NetworkID(NetworkChangeNotifier::CONNECTION_WIFI,
"test_ect_slow_2g", INT32_MIN)] =
nqe::internal::CachedNetworkQuality(EFFECTIVE_CONNECTION_TYPE_SLOW_2G);
read_prefs[nqe::internal::NetworkID(NetworkChangeNotifier::CONNECTION_4G,
"test_ect_4g", INT32_MIN)] =
nqe::internal::CachedNetworkQuality(EFFECTIVE_CONNECTION_TYPE_4G);
std::map<std::string, std::string> variation_params;
variation_params["persistent_cache_reading_enabled"] = "false";
variation_params["add_default_platform_observations"] = "false";
// Disable default platform values so that the effect of cached estimates
// at the time of startup can be studied in isolation.
TestNetworkQualityEstimator estimator(variation_params, true, true,
std::make_unique<BoundTestNetLog>());
// Add observers.
TestRTTObserver rtt_observer;
TestThroughputObserver throughput_observer;
TestRTTAndThroughputEstimatesObserver rtt_throughput_observer;
TestEffectiveConnectionTypeObserver effective_connection_type_observer;
estimator.AddRTTObserver(&rtt_observer);
estimator.AddThroughputObserver(&throughput_observer);
estimator.AddRTTAndThroughputEstimatesObserver(&rtt_throughput_observer);
estimator.AddEffectiveConnectionTypeObserver(
&effective_connection_type_observer);
std::string network_name("test_ect_2g");
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, network_name);
EXPECT_EQ(0u, rtt_observer.observations().size());
EXPECT_EQ(0u, throughput_observer.observations().size());
EXPECT_LE(0, rtt_throughput_observer.notifications_received());
// Simulate reading of prefs.
estimator.OnPrefsRead(read_prefs);
histogram_tester.ExpectUniqueSample("NQE.Prefs.ReadSize", read_prefs.size(),
1);
// Force read the network quality store from the store to verify that store
// gets populated even if reading of prefs is not enabled.
nqe::internal::CachedNetworkQuality cached_network_quality;
EXPECT_TRUE(estimator.network_quality_store_->GetById(
nqe::internal::NetworkID(NetworkChangeNotifier::CONNECTION_WIFI,
"test_ect_2g", INT32_MIN),
&cached_network_quality));
EXPECT_EQ(EFFECTIVE_CONNECTION_TYPE_2G,
cached_network_quality.effective_connection_type());
// Taken from network_quality_estimator_params.cc.
EXPECT_EQ(nqe::internal::InvalidRTT(),
rtt_observer.last_rtt(
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP_CACHED_ESTIMATE));
EXPECT_EQ(nqe::internal::InvalidRTT(),
rtt_observer.last_rtt(
NETWORK_QUALITY_OBSERVATION_SOURCE_TRANSPORT_CACHED_ESTIMATE));
EXPECT_EQ(0u, throughput_observer.observations().size());
EXPECT_EQ(
0u,
effective_connection_type_observer.effective_connection_types().size());
// Change to a different connection type.
network_name = "test_ect_slow_2g";
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, network_name);
EXPECT_EQ(nqe::internal::InvalidRTT(),
rtt_observer.last_rtt(
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP_CACHED_ESTIMATE));
EXPECT_EQ(nqe::internal::InvalidRTT(),
rtt_observer.last_rtt(
NETWORK_QUALITY_OBSERVATION_SOURCE_TRANSPORT_CACHED_ESTIMATE));
EXPECT_EQ(0U, throughput_observer.observations().size());
// Cleanup.
estimator.RemoveRTTObserver(&rtt_observer);
estimator.RemoveThroughputObserver(&throughput_observer);
estimator.RemoveRTTAndThroughputEstimatesObserver(&rtt_throughput_observer);
estimator.RemoveEffectiveConnectionTypeObserver(
&effective_connection_type_observer);
}
// Tests that |ComputeBandwidthDelayProduct| calculates the
// BDP correctly and records histogram data.
TEST_F(NetworkQualityEstimatorTest, TestBDPComputation) {
TestNetworkQualityEstimator estimator;
base::HistogramTester histogram_tester;
base::TimeTicks now = base::TimeTicks::Now();
for (int i = 1; i <= std::pow(2, 10); i *= 2) {
estimator
.rtt_ms_observations_[nqe::internal::OBSERVATION_CATEGORY_TRANSPORT]
.AddObservation(NetworkQualityEstimator::Observation(
i, now, INT32_MIN, NETWORK_QUALITY_OBSERVATION_SOURCE_TCP));
}
for (int i = 1; i <= std::pow(3, 10); i *= 3) {
estimator.http_downstream_throughput_kbps_observations_.AddObservation(
NetworkQualityEstimator::Observation(
i, now, INT32_MIN, NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP));
}
estimator.RunOneRequest();
// Histograms must contain at least one entry each.
EXPECT_GE(
1u, histogram_tester
.GetAllSamples("NQE.BDPComputationTransportRTT.OnECTComputation")
.size());
EXPECT_GE(1u, histogram_tester
.GetAllSamples("NQE.BDPComputationKbps.OnECTComputation")
.size());
EXPECT_GE(
1u,
histogram_tester.GetAllSamples("NQE.BDPKbits.OnECTComputation").size());
EXPECT_TRUE(estimator.GetBandwidthDelayProductKbits().has_value());
EXPECT_EQ(estimator.GetBandwidthDelayProductKbits().value(),
(int32_t)(std::pow(2, 2) * std::pow(3, 8) / 1000));
}
TEST_F(NetworkQualityEstimatorTest,
TestComputeIncreaseInTransportRTTFullHostsOverlap) {
base::SimpleTestTickClock tick_clock;
tick_clock.Advance(base::TimeDelta::FromMinutes(1));
std::map<std::string, std::string> variation_params;
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
estimator.SetTickClockForTesting(&tick_clock);
base::TimeTicks now = tick_clock.NowTicks();
base::TimeTicks recent = now - base::TimeDelta::FromMilliseconds(2500);
base::TimeTicks historical = now - base::TimeDelta::FromSeconds(20);
// Add historical observations. The 0 percentile for |host| is |10 * host|
// ms.
for (int host = 1; host <= 3; ++host) {
for (int rtt = 10 * host; rtt <= 10 * host + 20; ++rtt) {
estimator
.rtt_ms_observations_[nqe::internal::OBSERVATION_CATEGORY_TRANSPORT]
.AddObservation(NetworkQualityEstimator::Observation(
rtt, historical, INT32_MIN,
NETWORK_QUALITY_OBSERVATION_SOURCE_TCP,
static_cast<uint64_t>(host)));
}
}
// Add recent observations. The 50 percentile for |host| is |10 * host + 10|
// ms. The difference between them is expected to be 10 ms.
for (int host = 1; host <= 3; ++host) {
for (int rtt = 10 * host + 5; rtt <= 10 * host + 15; ++rtt) {
estimator
.rtt_ms_observations_[nqe::internal::OBSERVATION_CATEGORY_TRANSPORT]
.AddObservation(NetworkQualityEstimator::Observation(
rtt, recent, INT32_MIN, NETWORK_QUALITY_OBSERVATION_SOURCE_TCP,
static_cast<uint64_t>(host)));
}
}
EXPECT_EQ(10, estimator.ComputeIncreaseInTransportRTTForTests().value_or(0));
}
TEST_F(NetworkQualityEstimatorTest,
TestComputeIncreaseInTransportRTTPartialHostsOverlap) {
base::SimpleTestTickClock tick_clock;
tick_clock.Advance(base::TimeDelta::FromMinutes(1));
std::map<std::string, std::string> variation_params;
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
estimator.SetTickClockForTesting(&tick_clock);
base::TimeTicks now = tick_clock.NowTicks();
base::TimeTicks recent = now - base::TimeDelta::FromMilliseconds(2500);
base::TimeTicks historical = now - base::TimeDelta::FromSeconds(20);
// Add historical observations for hosts 1 and 2 with minimum RTT as
// |10 * host|.
for (int host = 1; host <= 2; ++host) {
for (int rtt = 10 * host; rtt <= 10 * host + 20; ++rtt) {
estimator.AddAndNotifyObserversOfRTT(NetworkQualityEstimator::Observation(
rtt, historical, INT32_MIN, NETWORK_QUALITY_OBSERVATION_SOURCE_TCP,
static_cast<uint64_t>(host)));
}
}
// Add recent observations, with median RTT as |10 + host| over the
// historical minimum for hosts 2 and 3.
for (int host = 2; host <= 3; ++host) {
for (int rtt = 11 * host + 5; rtt <= 11 * host + 15; ++rtt) {
estimator.AddAndNotifyObserversOfRTT(NetworkQualityEstimator::Observation(
rtt, recent, INT32_MIN, NETWORK_QUALITY_OBSERVATION_SOURCE_TCP,
static_cast<uint64_t>(host)));
}
}
// Only host 2 should have contributed to the calculation. Hence, the median
// should be |10 + 2 = 12|.
EXPECT_EQ(12, estimator.ComputeIncreaseInTransportRTTForTests().value_or(0));
}
// Verifies that when the cached network qualities from the prefs are available,
// then estimates from the platform or the external estimate provider are not
// used.
TEST_F(NetworkQualityEstimatorTest,
ObservationDiscardedIfCachedEstimateAvailable) {
base::HistogramTester histogram_tester;
// Construct the read prefs.
std::map<nqe::internal::NetworkID, nqe::internal::CachedNetworkQuality>
read_prefs;
read_prefs[nqe::internal::NetworkID(NetworkChangeNotifier::CONNECTION_WIFI,
"test_2g", INT32_MIN)] =
nqe::internal::CachedNetworkQuality(EFFECTIVE_CONNECTION_TYPE_2G);
std::map<std::string, std::string> variation_params;
variation_params["persistent_cache_reading_enabled"] = "true";
variation_params["add_default_platform_observations"] = "false";
// Disable default platform values so that the effect of cached estimates
// at the time of startup can be studied in isolation.
TestNetworkQualityEstimator estimator(variation_params, true, true,
std::make_unique<BoundTestNetLog>());
// Add observers.
TestRTTObserver rtt_observer;
TestThroughputObserver throughput_observer;
estimator.AddRTTObserver(&rtt_observer);
estimator.AddThroughputObserver(&throughput_observer);
std::string network_name("test_2g");
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, network_name);
EXPECT_EQ(0u, rtt_observer.observations().size());
EXPECT_EQ(0u, throughput_observer.observations().size());
EXPECT_EQ(
0u,
estimator
.rtt_ms_observations_[nqe::internal::OBSERVATION_CATEGORY_TRANSPORT]
.Size());
EXPECT_EQ(0u, estimator.http_downstream_throughput_kbps_observations_.Size());
// Simulate reading of prefs.
estimator.OnPrefsRead(read_prefs);
histogram_tester.ExpectUniqueSample("NQE.Prefs.ReadSize", read_prefs.size(),
1);
// Taken from network_quality_estimator_params.cc.
EXPECT_EQ(base::TimeDelta::FromMilliseconds(1800),
rtt_observer.last_rtt(
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP_CACHED_ESTIMATE));
EXPECT_EQ(base::TimeDelta::FromMilliseconds(1500),
rtt_observer.last_rtt(
NETWORK_QUALITY_OBSERVATION_SOURCE_TRANSPORT_CACHED_ESTIMATE));
EXPECT_EQ(2u, rtt_observer.observations().size());
// RTT observation with source
// DEPRECATED_NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP_EXTERNAL_ESTIMATE should
// be removed from |estimator.rtt_ms_observations_| when a cached estimate is
// received.
EXPECT_EQ(
1u,
estimator.rtt_ms_observations_[nqe::internal::OBSERVATION_CATEGORY_HTTP]
.Size());
EXPECT_EQ(
1u,
estimator
.rtt_ms_observations_[nqe::internal::OBSERVATION_CATEGORY_TRANSPORT]
.Size());
// When a cached estimate is available, RTT observations from the external
// estimate provider and platform must be discarded.
estimator.AddAndNotifyObserversOfRTT(nqe::internal::Observation(
1, base::TimeTicks::Now(), INT32_MIN,
DEPRECATED_NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP_EXTERNAL_ESTIMATE));
estimator.AddAndNotifyObserversOfRTT(nqe::internal::Observation(
1, base::TimeTicks::Now(), INT32_MIN,
NETWORK_QUALITY_OBSERVATION_SOURCE_DEFAULT_HTTP_FROM_PLATFORM));
EXPECT_EQ(3u, rtt_observer.observations().size());
EXPECT_EQ(
2u,
estimator.rtt_ms_observations_[nqe::internal::OBSERVATION_CATEGORY_HTTP]
.Size());
EXPECT_EQ(
1u,
estimator
.rtt_ms_observations_[nqe::internal::OBSERVATION_CATEGORY_TRANSPORT]
.Size());
estimator.AddAndNotifyObserversOfRTT(
nqe::internal::Observation(1, base::TimeTicks::Now(), INT32_MIN,
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP));
EXPECT_EQ(4u, rtt_observer.observations().size());
EXPECT_EQ(
3u,
estimator.rtt_ms_observations_[nqe::internal::OBSERVATION_CATEGORY_HTTP]
.Size());
EXPECT_EQ(
1u,
estimator
.rtt_ms_observations_[nqe::internal::OBSERVATION_CATEGORY_TRANSPORT]
.Size());
// When a cached estimate is available, throughput observations from the
// external estimate provider and platform must be discarded.
EXPECT_EQ(1u, throughput_observer.observations().size());
// Throughput observation with source
// DEPRECATED_NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP_EXTERNAL_ESTIMATE should
// be removed from |estimator.downstream_throughput_kbps_observations_| when a
// cached estimate is received.
EXPECT_EQ(1u, estimator.http_downstream_throughput_kbps_observations_.Size());
estimator.AddAndNotifyObserversOfThroughput(nqe::internal::Observation(
1, base::TimeTicks::Now(), INT32_MIN,
DEPRECATED_NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP_EXTERNAL_ESTIMATE));
estimator.AddAndNotifyObserversOfThroughput(nqe::internal::Observation(
1, base::TimeTicks::Now(), INT32_MIN,
NETWORK_QUALITY_OBSERVATION_SOURCE_DEFAULT_HTTP_FROM_PLATFORM));
EXPECT_EQ(2u, throughput_observer.observations().size());
EXPECT_EQ(2u, estimator.http_downstream_throughput_kbps_observations_.Size());
estimator.AddAndNotifyObserversOfThroughput(
nqe::internal::Observation(1, base::TimeTicks::Now(), INT32_MIN,
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP));
EXPECT_EQ(3u, throughput_observer.observations().size());
EXPECT_EQ(3u, estimator.http_downstream_throughput_kbps_observations_.Size());
base::RunLoop().RunUntilIdle();
}
// Tests that the ECT is computed when more than N RTT samples have been
// received.
TEST_F(NetworkQualityEstimatorTest, MaybeComputeECTAfterNSamples) {
base::SimpleTestTickClock tick_clock;
tick_clock.Advance(base::TimeDelta::FromMinutes(1));
std::map<std::string, std::string> variation_params;
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
estimator.DisableOfflineCheckForTesting(true);
base::RunLoop().RunUntilIdle();
estimator.SetTickClockForTesting(&tick_clock);
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_UNKNOWN, "test");
tick_clock.Advance(base::TimeDelta::FromMinutes(1));
const base::TimeDelta rtt = base::TimeDelta::FromSeconds(1);
uint64_t host = 1u;
// Fill the observation buffer so that ECT computations are not triggered due
// to observation buffer's size increasing to 1.5x.
for (size_t i = 0; i < estimator.params()->observation_buffer_size(); ++i) {
estimator.AddAndNotifyObserversOfRTT(NetworkQualityEstimator::Observation(
rtt.InMilliseconds(), tick_clock.NowTicks(), INT32_MIN,
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP, host));
}
EXPECT_EQ(rtt, estimator.GetHttpRTT().value());
tick_clock.Advance(base::TimeDelta::FromMinutes(60));
const base::TimeDelta rtt_new = base::TimeDelta::FromSeconds(3);
for (size_t i = 0;
i < estimator.params()->count_new_observations_received_compute_ect();
++i) {
estimator.AddAndNotifyObserversOfRTT(NetworkQualityEstimator::Observation(
rtt_new.InMilliseconds(), tick_clock.NowTicks(), INT32_MIN,
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP, host));
}
EXPECT_EQ(rtt_new, estimator.GetHttpRTT().value());
}
// Tests that the hanging request is correctly detected.
TEST_F(NetworkQualityEstimatorTest, HangingRequestUsingHttpOnly) {
base::HistogramTester histogram_tester;
std::map<std::string, std::string> variation_params;
variation_params["add_default_platform_observations"] = "false";
variation_params["hanging_request_http_rtt_upper_bound_http_rtt_multiplier"] =
"6";
variation_params["hanging_request_upper_bound_min_http_rtt_msec"] = "500";
TestNetworkQualityEstimator estimator(variation_params);
// 500 msec.
const int32_t hanging_request_threshold =
estimator.params()
->hanging_request_upper_bound_min_http_rtt()
.InMilliseconds();
estimator.SetStartTimeNullHttpRtt(base::TimeDelta::FromMilliseconds(5));
base::RunLoop().RunUntilIdle();
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_UNKNOWN, "test");
const struct {
base::TimeDelta observed_http_rtt;
std::string histogram_name;
} tests[] = {
{base::TimeDelta::FromMilliseconds(10),
"NQE.RTT.NotAHangingRequest.HttpRTT"},
{base::TimeDelta::FromMilliseconds(100),
"NQE.RTT.NotAHangingRequest.MinHttpBound"},
{base::TimeDelta::FromMilliseconds(hanging_request_threshold - 1),
"NQE.RTT.NotAHangingRequest.MinHttpBound"},
{base::TimeDelta::FromMilliseconds(hanging_request_threshold + 1),
"NQE.RTT.HangingRequest"},
{base::TimeDelta::FromMilliseconds(1000), "NQE.RTT.HangingRequest"},
};
for (const auto& test : tests) {
EXPECT_EQ(
test.observed_http_rtt.InMilliseconds() >= hanging_request_threshold,
estimator.IsHangingRequest(test.observed_http_rtt));
histogram_tester.ExpectBucketCount(
test.histogram_name, test.observed_http_rtt.InMilliseconds(), 1);
}
// Verify total sample count in all histograms.
histogram_tester.ExpectTotalCount("NQE.RTT.NotAHangingRequest.TransportRTT",
0);
histogram_tester.ExpectTotalCount("NQE.RTT.NotAHangingRequest.HttpRTT", 1);
histogram_tester.ExpectTotalCount("NQE.RTT.NotAHangingRequest.MinHttpBound",
2);
histogram_tester.ExpectTotalCount("NQE.RTT.HangingRequest", 2);
}
// Tests that the hanging request is correctly detected using end-to-end RTT.
TEST_F(NetworkQualityEstimatorTest, HangingRequestEndToEndUsingHttpOnly) {
std::map<std::string, std::string> variation_params;
variation_params["add_default_platform_observations"] = "false";
variation_params["hanging_request_http_rtt_upper_bound_http_rtt_multiplier"] =
"6";
variation_params["hanging_request_upper_bound_min_http_rtt_msec"] = "500";
variation_params["use_end_to_end_rtt"] = "true";
int end_to_end_rtt_milliseconds = 1000;
int hanging_request_http_rtt_upper_bound_transport_rtt_multiplier = 8;
TestNetworkQualityEstimator estimator(variation_params);
estimator.SetStartTimeNullHttpRtt(base::TimeDelta::FromMilliseconds(10));
base::RunLoop().RunUntilIdle();
estimator.set_start_time_null_end_to_end_rtt(
base::TimeDelta::FromMilliseconds(end_to_end_rtt_milliseconds));
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_UNKNOWN, "test");
const struct {
base::TimeDelta observed_http_rtt;
bool is_end_to_end_rtt_sample_count_enough;
bool expect_hanging_request;
std::string histogram_name;
} tests[] = {
{base::TimeDelta::FromMilliseconds(10), true, false,
"NQE.RTT.NotAHangingRequest.EndToEndRTT"},
{base::TimeDelta::FromMilliseconds(10), false, false,
"NQE.RTT.NotAHangingRequest.HttpRTT"},
{base::TimeDelta::FromMilliseconds(100), true, false,
"NQE.RTT.NotAHangingRequest.EndToEndRTT"},
// |observed_http_rtt| is not large enough. Request is expected to be
// classified as not hanging.
{base::TimeDelta::FromMilliseconds(
(end_to_end_rtt_milliseconds *
hanging_request_http_rtt_upper_bound_transport_rtt_multiplier) -
1),
true, false, "NQE.RTT.NotAHangingRequest.EndToEndRTT"},
// |observed_http_rtt| is large. Request is expected to be classified as
// hanging.
{base::TimeDelta::FromMilliseconds(
(end_to_end_rtt_milliseconds *
hanging_request_http_rtt_upper_bound_transport_rtt_multiplier) +
1),
true, true, "NQE.RTT.HangingRequest"},
// Not enough end-to-end RTT samples. Request is expected to be classified
// as hanging.
{base::TimeDelta::FromMilliseconds(
end_to_end_rtt_milliseconds *
hanging_request_http_rtt_upper_bound_transport_rtt_multiplier -
1),
false, true, "NQE.RTT.HangingRequest"},
};
for (const auto& test : tests) {
base::HistogramTester histogram_tester;
if (test.is_end_to_end_rtt_sample_count_enough) {
estimator.set_start_time_null_end_to_end_rtt_observation_count(
estimator.params()->http_rtt_transport_rtt_min_count());
} else {
estimator.set_start_time_null_end_to_end_rtt_observation_count(
estimator.params()->http_rtt_transport_rtt_min_count() - 1);
}
EXPECT_EQ(test.expect_hanging_request,
estimator.IsHangingRequest(test.observed_http_rtt));
histogram_tester.ExpectBucketCount(
test.histogram_name, test.observed_http_rtt.InMilliseconds(), 1);
}
}
TEST_F(NetworkQualityEstimatorTest, HangingRequestUsingTransportAndHttpOnly) {
base::HistogramTester histogram_tester;
std::map<std::string, std::string> variation_params;
variation_params["add_default_platform_observations"] = "false";
variation_params
["hanging_request_http_rtt_upper_bound_transport_rtt_multiplier"] = "8";
variation_params["hanging_request_http_rtt_upper_bound_http_rtt_multiplier"] =
"6";
variation_params["hanging_request_upper_bound_min_http_rtt_msec"] = "500";
const base::TimeDelta transport_rtt = base::TimeDelta::FromMilliseconds(100);
TestNetworkQualityEstimator estimator(variation_params);
// 800 msec.
const int32_t hanging_request_threshold =
transport_rtt.InMilliseconds() *
estimator.params()
->hanging_request_http_rtt_upper_bound_transport_rtt_multiplier();
estimator.DisableOfflineCheckForTesting(true);
estimator.SetStartTimeNullHttpRtt(base::TimeDelta::FromMilliseconds(5));
for (size_t i = 0; i < 100; ++i) {
// Throw enough transport RTT samples so that transport RTT estimate is
// recomputed.
estimator.AddAndNotifyObserversOfRTT(NetworkQualityEstimator::Observation(
transport_rtt.InMilliseconds(), base::TimeTicks::Now(), INT32_MIN,
NETWORK_QUALITY_OBSERVATION_SOURCE_TCP, 0));
}
base::RunLoop().RunUntilIdle();
EXPECT_EQ(transport_rtt, estimator.GetTransportRTT());
const struct {
base::TimeDelta observed_http_rtt;
std::string histogram_name;
} tests[] = {
{base::TimeDelta::FromMilliseconds(100),
"NQE.RTT.NotAHangingRequest.TransportRTT"},
{base::TimeDelta::FromMilliseconds(500),
"NQE.RTT.NotAHangingRequest.TransportRTT"},
{base::TimeDelta::FromMilliseconds(hanging_request_threshold - 1),
"NQE.RTT.NotAHangingRequest.TransportRTT"},
{base::TimeDelta::FromMilliseconds(hanging_request_threshold + 1),
"NQE.RTT.HangingRequest"},
{base::TimeDelta::FromMilliseconds(1000), "NQE.RTT.HangingRequest"},
};
for (const auto& test : tests) {
EXPECT_EQ(
test.observed_http_rtt.InMilliseconds() >= hanging_request_threshold,
estimator.IsHangingRequest(test.observed_http_rtt));
histogram_tester.ExpectBucketCount(
test.histogram_name, test.observed_http_rtt.InMilliseconds(), 1);
}
// Verify total sample count in all histograms.
histogram_tester.ExpectTotalCount("NQE.RTT.NotAHangingRequest.TransportRTT",
3);
histogram_tester.ExpectTotalCount("NQE.RTT.NotAHangingRequest.HttpRTT", 0);
histogram_tester.ExpectTotalCount("NQE.RTT.NotAHangingRequest.MinHttpBound",
0);
histogram_tester.ExpectTotalCount("NQE.RTT.HangingRequest", 2);
}
} // namespace net