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2acd163448
Bug: None Change-Id: I4499adaf8e777d570a3bc119ee29727ab7c790a5 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/128962 Commit-Queue: Steve Anton <steveanton@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#27271}
79 lines
2.1 KiB
C++
79 lines
2.1 KiB
C++
/*
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* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "rtc_base/numerics/samples_stats_counter.h"
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#include <math.h>
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#include <random>
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#include <vector>
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#include "absl/algorithm/container.h"
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#include "test/gtest.h"
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namespace webrtc {
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namespace {
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SamplesStatsCounter CreateStatsFilledWithIntsFrom1ToN(int n) {
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std::vector<double> data;
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for (int i = 1; i <= n; i++) {
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data.push_back(i);
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}
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absl::c_shuffle(data, std::mt19937(std::random_device()()));
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SamplesStatsCounter stats;
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for (double v : data) {
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stats.AddSample(v);
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}
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return stats;
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}
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} // namespace
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TEST(SamplesStatsCounter, FullSimpleTest) {
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SamplesStatsCounter stats = CreateStatsFilledWithIntsFrom1ToN(100);
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EXPECT_TRUE(!stats.IsEmpty());
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EXPECT_DOUBLE_EQ(stats.GetMin(), 1.0);
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EXPECT_DOUBLE_EQ(stats.GetMax(), 100.0);
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EXPECT_DOUBLE_EQ(stats.GetAverage(), 50.5);
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for (int i = 1; i <= 100; i++) {
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double p = i / 100.0;
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EXPECT_GE(stats.GetPercentile(p), i);
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EXPECT_LT(stats.GetPercentile(p), i + 1);
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}
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}
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TEST(SamplesStatsCounter, VarianceAndDeviation) {
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SamplesStatsCounter stats;
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stats.AddSample(2);
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stats.AddSample(2);
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stats.AddSample(-1);
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stats.AddSample(5);
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EXPECT_DOUBLE_EQ(stats.GetAverage(), 2.0);
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EXPECT_DOUBLE_EQ(stats.GetVariance(), 4.5);
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EXPECT_DOUBLE_EQ(stats.GetStandardDeviation(), sqrt(4.5));
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}
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TEST(SamplesStatsCounter, FractionPercentile) {
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SamplesStatsCounter stats = CreateStatsFilledWithIntsFrom1ToN(5);
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EXPECT_DOUBLE_EQ(stats.GetPercentile(0.5), 3);
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}
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TEST(SamplesStatsCounter, TestBorderValues) {
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SamplesStatsCounter stats = CreateStatsFilledWithIntsFrom1ToN(5);
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EXPECT_GE(stats.GetPercentile(0.01), 1);
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EXPECT_LT(stats.GetPercentile(0.01), 2);
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EXPECT_DOUBLE_EQ(stats.GetPercentile(1.0), 5);
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}
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} // namespace webrtc
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