| // Copyright 2014 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 "components/network_time/historical_latencies_container.h" |
| |
| #include "base/metrics/field_trial_params.h" |
| #include "base/test/scoped_feature_list.h" |
| #include "base/time/time.h" |
| #include "components/network_time/network_time_tracker.h" |
| #include "testing/gmock/include/gmock/gmock-matchers.h" |
| #include "testing/gtest/include/gtest/gtest.h" |
| #include "third_party/abseil-cpp/absl/types/optional.h" |
| |
| namespace network_time { |
| |
| TEST(HistoricalLatenciesContainerTest, StdDeviation) { |
| network_time::HistoricalLatenciesContainer latencies; |
| latencies.Record(base::Seconds(1)); |
| EXPECT_EQ(absl::nullopt, latencies.StdDeviation()); |
| |
| latencies.Record(base::Seconds(1)); |
| EXPECT_EQ(absl::nullopt, latencies.StdDeviation()); |
| |
| latencies.Record(base::Seconds(1)); |
| EXPECT_THAT(latencies.StdDeviation(), testing::Optional(base::Seconds(0))); |
| |
| latencies.Record(base::Seconds(2)); |
| EXPECT_NE(absl::nullopt, latencies.StdDeviation()); |
| // The standard deviation of [1,1,2] is 0.816. |
| EXPECT_EQ(816, latencies.StdDeviation().value().InMilliseconds()); |
| |
| latencies.Record(-base::Seconds(10)); |
| EXPECT_NE(absl::nullopt, latencies.StdDeviation()); |
| // The standard deviation of [1,2,-10] is 9.416. |
| EXPECT_EQ(9416, latencies.StdDeviation().value().InMilliseconds()); |
| |
| { |
| base::test::ScopedFeatureList scoped_feature_list; |
| scoped_feature_list.InitAndEnableFeatureWithParameters( |
| kNetworkTimeServiceQuerying, |
| base::FieldTrialParams({{"NumHistoricalLatencies", "2"}})); |
| EXPECT_NE(absl::nullopt, latencies.StdDeviation()); |
| // The standard deviation of [2,-10] is 8.485. |
| EXPECT_EQ(8485, latencies.StdDeviation().value().InMilliseconds()); |
| } |
| |
| { |
| base::test::ScopedFeatureList scoped_feature_list; |
| scoped_feature_list.InitAndEnableFeatureWithParameters( |
| kNetworkTimeServiceQuerying, |
| base::FieldTrialParams({{"NumHistoricalLatencies", "0"}})); |
| EXPECT_EQ(absl::nullopt, latencies.StdDeviation()); |
| } |
| |
| { |
| base::test::ScopedFeatureList scoped_feature_list; |
| scoped_feature_list.InitAndEnableFeatureWithParameters( |
| kNetworkTimeServiceQuerying, |
| base::FieldTrialParams({{"NumHistoricalLatencies", "-10"}})); |
| EXPECT_EQ(absl::nullopt, latencies.StdDeviation()); |
| } |
| |
| { |
| base::test::ScopedFeatureList scoped_feature_list; |
| scoped_feature_list.InitAndEnableFeatureWithParameters( |
| kNetworkTimeServiceQuerying, |
| base::FieldTrialParams({{"NumHistoricalLatencies", "200"}})); |
| EXPECT_EQ(absl::nullopt, latencies.StdDeviation()); |
| } |
| } |
| |
| } // namespace network_time |