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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <cmath>
#include "components/page_load_metrics/browser/observers/ad_metrics/univariate_stats.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace page_load_metrics {
TEST(UnivariateStatsTest, NoData) {
UnivariateStats stats;
UnivariateStats::DistributionMoments moments = stats.CalculateStats();
EXPECT_DOUBLE_EQ(moments.mean, 0);
EXPECT_DOUBLE_EQ(moments.variance, 0);
EXPECT_DOUBLE_EQ(moments.skewness, 0);
EXPECT_DOUBLE_EQ(moments.excess_kurtosis, -3);
}
TEST(UnivariateStatsTest, OneDataPoint) {
UnivariateStats stats;
stats.Accumulate(/*value=*/1, /*weight=*/1);
UnivariateStats::DistributionMoments moments = stats.CalculateStats();
EXPECT_DOUBLE_EQ(moments.mean, 1);
EXPECT_DOUBLE_EQ(moments.variance, 0);
EXPECT_DOUBLE_EQ(moments.skewness, 0);
EXPECT_DOUBLE_EQ(moments.excess_kurtosis, -3);
}
TEST(UnivariateStatsTest, TwoDataPoints_EqualWeight) {
UnivariateStats stats;
stats.Accumulate(/*value=*/1, /*weight=*/1);
stats.Accumulate(/*value=*/2, /*weight=*/1);
UnivariateStats::DistributionMoments moments = stats.CalculateStats();
EXPECT_DOUBLE_EQ(moments.mean, 1.5);
EXPECT_DOUBLE_EQ(moments.variance, 0.25);
EXPECT_DOUBLE_EQ(moments.skewness, 0);
EXPECT_DOUBLE_EQ(moments.excess_kurtosis, -2);
}
TEST(UnivariateStatsTest, TwoDataPoints_UnequalWeight) {
UnivariateStats stats;
stats.Accumulate(/*value=*/1, /*weight=*/3);
stats.Accumulate(/*value=*/2, /*weight=*/1);
UnivariateStats::DistributionMoments moments = stats.CalculateStats();
EXPECT_DOUBLE_EQ(moments.mean, 5.0 / 4);
EXPECT_DOUBLE_EQ(moments.variance, 3.0 / 16);
EXPECT_DOUBLE_EQ(moments.skewness, 2.0 / std::sqrt(3));
EXPECT_DOUBLE_EQ(moments.excess_kurtosis, -2.0 / 3);
}
} // namespace page_load_metrics
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